HP LT3200 User manual

High-Definition LCD TV Service Manual
Models: LT3200, LT3700, LT4200, LT4700

Copyright 2007, 2008 Hewlett-Packard Development Company, L.P. The information contained herein is
subject to change without notice.
Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and other countries.
The only warranties for HP products and services are set forth in the express warranty statements accompanying
such products and services. Nothing herein should be construed as constituting an additional warranty HP shall
not be liable for technical or editorial errors or omissions contained herein.
This document contains proprietary information that is protected by copyright. No part of this document may be
photocopied, reproduced, or translated to another language without the prior written consent of Hewlett-Packard
Company.
Service Reference Guide
Business PCs
Second Edition (April 2008)
First Edition (June 2007)
Document Part Number: 454404-002

HP High-Definition LCD TV Service Manual iii
Table of Contents
High-Definition LCD TV Service Manual ................................................................................................................ 1
Models: LT3200, LT3700, LT4200, LT4700................................................................................................................. 1
Table of Contents........................................................................................................................................................iii
Important Service Safety Precautions....................................................................................................................... 1
Warnings and Cautions................................................................................................................................................. 1
Safe Handling and Servicing......................................................................................................................................... 2
Repair Tips............................................................................................................................................................... 3
About Lead-Free Solder........................................................................................................................................... 3
Suggested Pb-Free Solder ........................................................................................................................................ 4
Servicing of Surface-Mounted Devices (SMDs)...................................................................................................... 4
Rework on Ball GridArray (BGA) ICs.................................................................................................................... 5
Product Information and Specifications................................................................................................................... 6
Product Information...................................................................................................................................................... 6
Product Profile ......................................................................................................................................................... 6
Specifications................................................................................................................................................................ 6
LCD Panel Module................................................................................................................................................... 6
General TV Specifications LT3200 and LT3700..................................................................................................... 7
General TV Specifications LT4200 and LT4700..................................................................................................... 9
I/O Connectors........................................................................................................................................................11
Factory Preset Display Modes.................................................................................................................................11
Controlling the Onscreen Display.......................................................................................................................... 12
TV Indicators and Controls.................................................................................................................................... 12
Remote Control...................................................................................................................................................... 13
TV Connectors....................................................................................................................................................... 14
Connectors.............................................................................................................................................................. 17
Basic Operation......................................................................................................................................................... 20
Basic Operation........................................................................................................................................................... 20
OSD (On-Screen Display) Functions – Simplemenu ............................................................................................ 20
OSD Functions – Fullmenu ................................................................................................................................... 21
Command Table RS-232............................................................................................................................................. 25
Return messages.......................................................................................................................................................... 32
Special command extension................................................................................................................................... 32
Replaceable Parts...................................................................................................................................................... 33
Parts List by Model..................................................................................................................................................... 33
Model LT3200........................................................................................................................................................ 33
Model LT3700 ....................................................................................................................................................... 34
Model LT4200 ....................................................................................................................................................... 35
Model LT4700 ....................................................................................................................................................... 36
Replacement Parts List Reference Pictures............................................................................................................ 37
Removal and Replacement....................................................................................................................................... 42
Equipment and Tools Needed for Removal and Replacement.................................................................................... 42

iv HP High-Definition LCD TV Service Manual
Tools....................................................................................................................................................................... 42
After Service Checklist .......................................................................................................................................... 42
Basic Adjustment Settings...................................................................................................................................... 42
Four Models – Comparison Pictures........................................................................................................................... 43
LT3200................................................................................................................................................................... 43
LT3700................................................................................................................................................................... 43
LT4200................................................................................................................................................................... 44
LT4700................................................................................................................................................................... 44
Removal Procedures ................................................................................................................................................... 45
Removal Order....................................................................................................................................................... 45
Screws.................................................................................................................................................................... 45
Removing the Pedestal........................................................................................................................................... 46
Disassembling the Pedestal.................................................................................................................................... 47
Removing the Back Cover ..................................................................................................................................... 48
Removing the Function Keyboard.......................................................................................................................... 49
Removing the Infrared Board................................................................................................................................. 50
Removing the Wall Mount Brackets ...................................................................................................................... 51
Removing the Board Cover.................................................................................................................................... 52
Removing the Main Board..................................................................................................................................... 52
Removing the Power Supply.................................................................................................................................. 56
Removing the Main Bracket................................................................................................................................... 60
Removing the Inverters.......................................................................................................................................... 61
Removing the Speakers.......................................................................................................................................... 64
Removing the Control Board ................................................................................................................................. 66
Removing the Front Bezel...................................................................................................................................... 70
Diagnostics................................................................................................................................................................. 71
LED Indicators....................................................................................................................................................... 71
Software version information...................................................................................................................................... 71
How to run diagnostics ............................................................................................................................................... 71
How to get back to normal TV operation after running diagnostics........................................................................... 72
Installation menu......................................................................................................................................................... 72
Hotel mode.................................................................................................................................................................. 73
How to enable and disable...................................................................................................................................... 74
Troubleshooting......................................................................................................................................................... 75
Remote Control........................................................................................................................................................... 75
Function Key............................................................................................................................................................... 76
Power: TV Does Not Turn On..................................................................................................................................... 77
Audio .......................................................................................................................................................................... 78
VGA Input................................................................................................................................................................... 79
HDMI Input ................................................................................................................................................................ 80
DVI Input.................................................................................................................................................................... 81
YPbPr Input ................................................................................................................................................................ 82
TV/Video/S-video Input.............................................................................................................................................. 83
Troubleshooting Tips .................................................................................................................................................. 84
No Power................................................................................................................................................................ 84
No Video ................................................................................................................................................................ 84

HP High-Definition LCD TV Service Manual v
Keypad abnormal ................................................................................................................................................... 84
LED Display abnormal........................................................................................................................................... 84
Abnormal Display.................................................................................................................................................. 84
LED Display abnormal........................................................................................................................................... 85
LCD Panel Troubleshooting Tips................................................................................................................................ 85
Inverter board......................................................................................................................................................... 85
Control board (panel driver)................................................................................................................................... 85
LVDS cable............................................................................................................................................................ 85
Screen..................................................................................................................................................................... 85
Example of defective LCDs................................................................................................................................... 86
Chassis Layout and Overall Wiring Diagrams....................................................................................................... 89
Boards Layout (Typical of all models except 32-inch*)............................................................................................. 89
Connectors .................................................................................................................................................................. 90
Main Board............................................................................................................................................................. 90
Keypad and IR Boards ........................................................................................................................................... 91
Wires and Cables Wiring............................................................................................................................................ 92
Main Board............................................................................................................................................................. 92
Wiring Diagram .......................................................................................................................................................... 93
Firmware Update Procedure.................................................................................................................................... 94
Overview..................................................................................................................................................................... 94
Safe Software Update Procedure ................................................................................................................................ 94
Introduction............................................................................................................................................................ 94
Software Feature Requirement............................................................................................................................... 95
Software Update Procedure......................................................................................................................................... 95
Limitation of this Implementation.......................................................................................................................... 95

vi HP High-Definition LCD TV Service Manual

HP High-Definition LCD TV Service Manual 1
BEFORE SERVICING THE LCD MODULE, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
WHEN REPLACEMENT PARTS ARE REQUIRED, BE
SURE TO USE REPLACEMENT PARTS SPECIFIED
BY THE MANUFACTURER.
Proper service and repair is important to the safe, reliable
operation of all HP equipment. The service procedures
recommended by HP and described in this service manual
are effective methods of performing service operations.
Some of these service operations require the use of tools
specifically designed for their purpose, and should be used
as recommended.
It is important to note that this manual contains various
Cautions and Notices that should be carefully read in order
to minimize the risk of personal injury to service personnel.
Improper service methods may damage the equipment. It is
also important to understand that these Cautions and
Notices are not exhaustive. HP could not possibly know,
evaluate, and advise the service trade of all conceivable
ways in which service might be done or of the possible
hazardous consequences of each way. Consequently, HP
has not undertaken any such broad evaluation. Service
technicians who use service procedures or tools that are not
recommended by HP must exercise caution and be sure that
neither their safety nor the safe operation of the equipment
will be jeopardized by the service method selected.
Warnings and Cautions
WARNING: Critical components having special
safety characteristics are identified with a by the
reference number in the parts list.
WARNING: Use of substitute replacement parts,
which do not have the same specified safety
characteristics, may create shock, fire, or other
hazards. Under no circumstances should the
original design be modified or altered without
written permission from HP. HP assumes no
liability, express or implied, arising out of any
unauthorized modification of design. The service
technician assumes all liability.
CAUTION: To ensure the continued reliability of this
product, use only the original manufacturer’s
replacement parts, which are listed with their part
numbers in the “Replaceable Parts List” section of this
service manual.
WARNING: All ICs and many other
semiconductors are susceptible to electrostatic
discharges (ESDs). Careless handling during repair
can be life-threatening. When repairing, make sure
that you are connected with the same potential as
the mass of the set by a wristband with resistance.
Keep components and tools also at this same
potential.
WARNING:
1Never replace modules or other components while
the unit is turned on.
2When making settings, use plastic rather than metal
tools. This will prevent any short circuits and the
danger of a circuit becoming unstable.
WARNING: To prevent electrical shock, do not use
the polarized AC plug with an extension cord,
receptacle, or the outlet unless the blades can be
fully inserted to prevent blade exposure. To prevent
electrical shock, match the wide blade or plug to a
wide slot and fully insert.
WARNING: When replacement parts are required,
be sure to use replacement parts specified by the
manufacturer or have the same characteristics as
the original part. Unauthorized substitutions may
result in fire, electric shock, or other hazards.
Important Service Safety Precautions

2HP High-Definition LCD TV Service Manual
WARNINGS:
Safety regulations require that after a repair the set must be
returned in its original condition. In particular attention
should be paid to the following points:
NOTE: The wiring should be routed correctly and fixed
with the mounted cable clamps. The insulation of the main
leads should be checked for external damage.
•Do not touch the signal and the power connector while
this product is operating. Do not touch the EMI ground
part and the heat sink of the film filter.
•Do not supply a voltage higher than that specified to this
product. This may damage the product and may cause a
fire.
•Do not use this product in locations where the humidity
is extremely high, where it may be splashed with water,
or where flammable materials surround it. Do not install
or use the product in a location that does not satisfy the
specified environmental conditions. This may damage
the product and may cause a fire.
•If a foreign substance (such as water, metal, or liquid)
gets inside the panel module, immediately turn off the
power. Continuing to use the product, may cause fire or
electric shock.
•If the product emits smoke or an abnormal smell, or it
makes an abnormal sound, immediately turn off the
power. Continuing to use the product, may cause fire or
electric shock.
•Do not disconnect or connect the connector while power
to the product is on. It takes some time for the voltage to
drop to a sufficiently low level after the power has been
turned off. Confirm that the voltage has dropped to a
safe level before disconnecting or connecting the
connector.
•Do not pull out or insert the power cable from or to an
outlet with wet hands. It may cause electric shock.
•Do not damage or modify the power cable. It may cause
fire or electric shock.
•If the power cable is damaged, or if the connector is
loose, do not use the product; this can lead to fire or
electric shock.
•If the power connector or the connector of the power
cable becomes dirty or dusty, wipe it with a dry cloth.
Continuing to use the product may cause fire or electric
shock.
•The LCD module uses a high-voltage (maximum 450V
DC). Be cautious of electric shock and do not touch the
device circuitry when handling the LCD unit. Because
the capacitor of the device circuitry may remain charged
at the moment of power off, standing by for 1 minute is
strongly recommended before touching the device
circuitry.
•Use only with the cart, stand, tripod, bracket, or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid injury
from tip-over.
Safe Handling and Servicing
The work procedures shown with the Warning
symbol are important for ensuring the safety of
the product and the servicing work. Be sure to
follow these instructions.
•Before starting the work, secure a sufficient workspace.
•At all times, other than when adjusting and checking the
product, be sure to turn off the Power button and
disconnect the power cable from the power source of the
TV during servicing.
•To prevent electric shock and breakage of PC board,
start the servicing work at least 30 seconds after the
main power has been turned off. Especially when
installing and removing the power supply board and the
SUS board, which involve high voltages, start servicing
at least 2 minutes after the main power has been turned
off.
•While the main power is on, do not touch any parts or
circuits other than the ones specified. The high-voltage
power supply block within the LCD module has a
floating ground. If any connection other than the one
specified is made between the measuring equipment and
the high voltage power supply block, it can result in
electric shock or activation of the leakage-detection
circuit breaker.
•When installing the LCD module into and removing it
from the packing carton, be sure to have at least two
people perform the work while being careful to ensure
that the flexible printed-circuit cable of the LCD module
does not get caught by the packing carton.
•When the surface of the panel comes into contact with
the cushioning materials, be sure that there is no foreign
matter on top of the cushioning materials. Foreign
matter may scratch the surface of the panel.
•Be sure to remove static electricity from your body
before handling the circuit board.
•Be sure to handle the circuit board by holding the large
parts such as the heat sink or transformer. Failure to
observe this precaution may result in the occurrence of
an abnormality in the soldered areas.

HP High-Definition LCD TV Service Manual 3
•Do not stack the circuit boards. Failure to observe this
precaution may result in problems resulting from
scratches on the parts, the deformation of parts, and
short-circuits due to residual electric charge.
•Routing the wires and fixing them in position must be
done in accordance with the original routing and fixing
configuration when servicing is completed. All the wires
are routed far away from the areas that become hot (such
as the heat sink). These wires are fixed in position with
the wire clamps so that the wires do not move, thereby
ensuring that they are not damaged and their materials
do not deteriorate over long periods of time. Therefore,
route the cables and fix the cables to the original
position and states using the wire clamps.
•Perform a safety check when servicing is completed.
Verify that the peripherals of the serviced points have
not undergone any deterioration during servicing. Also
verify that the screws, parts, and cables removed for
servicing purposes have all been returned to their proper
locations in accordance with the original setup.
•A glass plate protects the LCD display. This glass plate
can be cleaned with a slightly moist cloth. If dirt appears
between the glass plate and the LCD display panel have
only a qualified service employee clean it.
Repair Tips
WARNING: All ICs and many other
semiconductors are susceptible to electrostatic
discharges (ESDs). Careless handling during repair
can be life-threatening. When repairing, make sure
that you are connected with the same potential as
the mass of the unit via a wrist wrap with
resistance. Keep components and tools also at the
same potential.
About Lead-Free Solder
NOTE: LEAD IS LISTED AS (PB) IN THE PERIODIC
TABLE OF THE ELEMENTS. IN THE INFORMATION
THAT FOLLOWS, PB WILL REFER TO LEAD
SOLDER, AND PBF WILL REFER TO LEAD-FREE
SOLDER. THE LEAD-FREE SOLDER USED IN OUR
MANUFACTURING PROCESS AND DISCUSSED
HERE IS (SN+AG+CU). THAT IS TIN (SN), SILVER
(AG), AND COPPER (CU), ALTHOUGH OTHER
TYPES ARE AVAILABLE.
This model is manufactured using Pb-free solder for the
sake of environmental conservation. For service and repair
work, we suggest using Pb-free solder as well, although Pb
solder may be used.
PCBs manufactured using Pb-free solder have the sign
stamped on the PCB.
CAUTIONS:
•Pb-free solder has a higher melting point than Pb solder.
Typically the melting point is 50–70ºF
(30–40°C) higher. Use a high temperature soldering
iron. Adjust your solder tool so that a temperature
around 360–380ºC is reached and stabilized at the solder
joint. Heating time of the solder joint should not exceed
4 seconds.Avoid temperatures above 400ºC; wear-out of
tips will rise drastically and flux-fluid will be destroyed.
•Pb-free solder will tend to splash when heated too high
(about 1,100ºF or 600ºC).
•Mix of Pb-free solder Tin (SN)/parts with leaded
soldering Tin (SN) in/parts is possible but not
recommended. If you have to use Pb solder, completely
remove all of the Pb-free solder on the pins or solder
area before applying Pb solder. If this is not practical, be
sure to heat the Pb-free solder until it melts, before
applying Pb solder.
•After applying Pb-free solder to double-layered boards,
check the component side for excess solder that may
flow onto the opposite side (see the following
illustration).

4HP High-Definition LCD TV Service Manual
•Special information for Pb-free BGA-ICs: These ICs
will be delivered in so-called dry-packaging to protect
the IC against moisture and with the Pb-free logo on it.
This packaging may only be opened shortly before it is
used (soldered). Otherwise the body of the IC gets wet
inside, and during the heating time the structure of the
IC will be destroyed from steam pressure. If the
packaging was opened before usage the IC has to be
heated up for about 90 hours to dry. Make sure you use
ESD protection!
Suggested Pb-Free Solder
Several kinds of Pb-free solder (some shown in the
following illustration) are available for purchase. This
product uses Sn+Ag+Cu (tin (SN), silver (AG), copper
(CU)) solder. However, Sn+Cu (tin (SN), copper (Cu)),
Sn+Zn+Bi (tin (SN), zinc (Zn), bismuth (Bi)) solder can
also be used.
Servicing of Surface-Mounted Devices
(SMDs)
CAUTIONS:
General cautions on handling and storage:
•Oxidation on the terminals of SMDs results in poor
soldering. Do not handle SMDs with bare hands.
•Avoid using storage places that are sensitive to
oxidation, such as places with sulphur or chlorine gas,
direct sunlight, high temperatures, or a high degree of
humidity. The capacitance or resistance value of the
SMDs may be affected by these conditions.
•Rough handling of circuit boards containing SMDs may
cause damage to the components as well as the circuit
boards. Circuit boards containing SMDs should never be
bent or flexed. Different circuit board materials expand
and contract at different rates when heated or cooled and
the components and/or solder connections may be
damaged due to the stress.
•Never rub or scrape chip components as this may cause
the value of the component to change. Similarly, do not
slide the circuit board across any surface.
Removal of SMDs
1Heat the solder (for 2 to 3 seconds) at each terminal of
the chip. By means of soldier wick and a slight
horizontal force, small components can be removed with
the soldering iron. They can also be removed with a
solder sucker (A).
2While holding the SMD with a pair of tweezers, take it
off gently using the soldering iron’s heat applied to each
terminal (B).
3Remove the excess solder on the solder lands by means
of soldier wick or a solder sucker (C).
CAUTIONS:
•When handling the soldering iron, use suitable pressure
and be careful.
•When removing the chip, do not use undue force with
the pair of tweezers.
•The soldering iron to be used (approx. 30 W) should
preferably be equipped with a thermal control (soldering
temperature: 360º to 380º C).
•Once removed, the chip cannot be reused.

HP High-Definition LCD TV Service Manual 5
Attachment of SMDs
1Locate the SMD on the solder lands by means of
tweezers and solder the component on one side. Ensure
that the component is positioned correctly on the solder
lands (A).
2Complete the soldering of the terminals of the
component (B).
CAUTIONS:
•When soldering the SMD terminals, do not touch them
directly with the soldering iron. The soldering should be
done as quickly as possible; care must be taken to avoid
damage to the terminals of the SMDs themselves.
•Keep the SMD’s body in contact with the printed board
when soldering.
•The soldering iron to be used (approximately 30 W)
should preferably be equipped with a thermal control
(soldering temperature: 360º to 380º C).
•Soldering should not be done outside the solder land.
•Soldering flux (of rosin) may be used but should not be
acidic.
•After soldering, let the SMD cool down gradually at
room temperature.
•The quantity of solder must be proportional to the size
of the solder land. If the quantity is too great, the SMD
might crack or the solder lands might be torn loose from
the printed board.
Rework on Ball GridArray (BGA) ICs
General information
Although (LF) BGA assembly yields are very high, there
may still be a requirement for component rework. By
rework, we mean the process of removing the component
from the PWB and replacing it with a new component. If an
(LF) BGA is removed from a PWB, the solder balls of the
component are deformed drastically so the removed (LF)
BGA has to be discarded.
Device removal
As is the case with any component that, it is essential when
removing an (LF) BGA, the board, tracks, solder lands, or
surrounding components are not damaged. To remove an
(LF) BGA, the board must be uniformly heated to a
temperature close to the reflow soldering temperature. A
uniform temperature reduces the chance of warping the
PWB. To do this, we recommend that the board is heated
until it is certain that all the joints are molten. Then
carefully pull the component off the board with a vacuum
nozzle. For the appropriate temperature profiles, see the IC
data sheet.
Area Preparation
When the component has been removed, the vacant IC area
must be cleaned before replacing the (LF) BGA.
Removing an IC often leaves varying amounts of solder on
the mounting lands. This excessive solder can be removed
with either a solder sucker or solder wick. The remaining
flux can be removed with a brush and cleaning agent. After
the board is properly cleaned and inspected, apply flux on
the solder lands and on the connection balls of the (LF)
BGA.
NOTE: Do not apply solder paste, as this has shown to
result in problems during resoldering.
Device replacement
The last step in the repair process is to solder the new
component on the board. Ideally, the (LF) BGA should be
aligned under a microscope or magnifying glass. If this is
not possible, try to align the (LF) BGA with any board
markers. To reflow the solder, apply a temperature profile
according to the IC data sheet. To avoid damaging
neighboring components, it may be necessary to reduce
some temperatures and times.

6HP High-Definition LCD TV Service Manual
Product Information
This specification table describes the key areas of all hardware service requirements of large entertainment High-Definition
LCD Television models LT3200, LT3700, LT4200, and LT4700.This document is for HP service personnel (bench and in-
home technicians) and ASP technicians in the repair and refurbishment of HP flat-panel televisions.
Product Profile
HP High-Definition Digital TV models LT3200, LT3700, LT4200, and LT4700 can display ATSC, NTSC and Clear-QAM TV
signals. All models also support High Definition Multimedia Interface (HDMI) and YPbPr (HD) display technology. All models
can be used as monitors for your PC with a VGA connector.
Specifications
LCD Panel Module
Model name LT3200
(32” Model) LT3700 (37” Model) LT4200 (42” Model) LT4700 (47” Model)
Number of pixels 1366 (H) x 768 (V) 1366 (H) x 768 (V) 1920 (H) x 1080 (V) 1920 (H) x 1080 (V)
Expected lifetime 60,000 hours 60,000 hours 60,000 hours 60,000 hours
NOTE: For more detailed specifications, refer to the panel specification documentation in the Appendix.
Product Information and Specifications

HP High-Definition LCD TV Service Manual 7
General TV Specifications LT3200 and LT3700
Model number LT3200 LT3700
Description 32” HDTV 37” HDTV
Availability June 2007 June 2007
Video
Brightness
Resolution
Contrast Ratio
Viewing Angle
Response Time
Scalar
Supported Input
500 cd/m2
1366 x 768
1200:1
176 degrees
8 ms
Trident PX66
480i, 480p, 720p, 1080i, 1080p (HDMI
only)
500 cd/m2
1366 x 768
1000:1
178 degrees
6 ms
Trident PX66
480i, 480p, 720p, 1080i, 1080p (HDMI
only)
ATSC/NTSC/Clear -QAM 1 1
Tuning Unidirectional Cable Card No No
Video
enhancers
3D Digital Comb Filter
Video Noise Reduction
3:2 Pull Down
HP Visual Fidelity Engine
Photorealistic Sharpness
Enhancement
3D Color Enrichment
Motion-Adaptive
Deinterlacer
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Speakers 2 x 10W, 1 way 2 x 10W, 1 way
Dolby Digital Out Yes Yes
Virtual Surround Sound Theater, Music Hall Theater, Music Hall
Audio
SAP/MTS Yes Yes
AV In 2 2
Component In (YPbPr) 2 2
HDMI 3 3
S-Video In 2 2
Antenna In (RF) 1 1
PC VGA In 1 1
Analog Audio In (L/R) 5 5
PC Audio In 1 1
RS-232c 1 1
USB Port (service only) 1 1
Audio Out 1 1
SPDIF Out 1 1
Connectivity
Composite 0 0

8HP High-Definition LCD TV Service Manual
General TV Specification Continued
Model number LT3200 LT3700
OSD Languages English/French/Spanish English/French/Spanish
Custom Input Presets Yes Yes
Custom Input Labeling Yes Yes
V-Chip Yes Yes
Closed Captioning Yes Yes
Sleep Timer Yes Yes
Favorite Channels Yes Yes
PIP/POP No No
Split Screen No No
Clock No No
Auto On No No
Convenience
EPG TV Guide Support No TV Guide No TV Guide
Finish and
Color Bezel and Stand 40%-60% Gloss Midnight Black,
Bezel and Stand 40%-60% Gloss Midnight Black, Bezel and Stand
Stand Detachable (included) Detachable (included)
Speakers Integrated Integrated
Remote Standard, Philips, 35-button Standard, Philips, 35-button
Wall mounts Optional/recommended Optional/recommended
Accessories
Media Center/DEC Optional/recommended Optional/recommended
Power supply 120VAC 60Hz 120VAC 60Hz
Power consumption (W) 180W 220W
Dimensions with stand
(H/W/D) (inches/centimeter) 24.0 (60.7) x 30.9 (78.5) x 9.4 (23.9) 26.7 (67.8) x 35.7 (90.7) x 11.0 (27.9)
Dimensions without stand
(H/W/D) (inches/centimeter) 21.6 (54.8) x 30.9 (78.5) x 5.0 (12.7) 24.3 (61.7) x 35.7 (90.7) x 5.2 (13.2)
Weight (with stand) 40.7 lb/18 kg 49.5 lb/22 kg
Weight (without stand) 33 lb/15 kg 40.7 lb/18 kg
VESA wall mount standard VESA 200mm VESA 200mm
Energy Star Yes Yes
General
Front Bezel Trademarks Dolby Digital Dolby Digital
Regulatory
compliance Safety FCC Class B, C-UL and UI FCC Class B, C-UL and UI

HP High-Definition LCD TV Service Manual 9
General TV Specifications LT4200 and LT4700
Model number LT4200 LT4700
Description 42” HDTV 47” HDTV
Availability (On Ad) June 2007 June 2007
Video
Brightness
Resolution
Contrast Ratio
Viewing Angle
Response Time
Scalar
Supported Input
500 cd/m2
1920 x 1080
1200:1
176 degrees
8 ms
Trident LX66
480i, 480p, 720p, 1080i, 1080p (HDMI
only)
500 cd/m2
1920 x 1080
1200:1
176 degrees
6.5 ms
Trident LX66
480i, 480p, 720p, 1080i, 1080p (HDMI
only)
ATSC/NTSC/Clear -QAM 1 1
Tuning Unidirectional Cable Card No No
Video
enhancers
3D Digital Comb Filter
Video Noise Reduction
3:2 Pull down
HP Visual Fidelity Engine
Photorealistic Sharpness
Enhancement
3D Color Enrichment
Motion-adaptive
Deinterlacer
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Speakers 2 x 10W, 1 way 2 x 10W, 1 way
Dolby Digital Out Yes Yes
Virtual Surround Sound Theater, Music Hall Theater, Music Hall
Audio
SAP/MTS Yes Yes
AV 2 2
Component In (YPbPr) 2 2
HDMI 3 3
S-Video In 2 2
Antenna In (RF) 1 1
PC VGA In 1 1
Analog Audio In (L/R) 5 5
PC Audio In 1 1
RS-232c 1 1
USB Port (service only) 1 1
Audio Out 1 1
SPDIF Out 1 1
Connectivity
Composite 0 0

10 HP High-Definition LCD TV Service Manual
General TV Specification Continued
Model number LT4200 LT4700
OSD Languages English/French/Spanish English/French/Spanish
Custom Input Presets Yes Yes
Custom Input Labeling Yes Yes
V-Chip Yes Yes
Closed Captioning Yes Yes
Sleep Timer Yes Yes
Favorite Channels Yes Yes
PIP/POP No No
Split Screen No No
Clock No No
Auto On No No
Convenience
EPG TV Guide Support No TV Guide No TV Guide
Finish and
Color Bezel and Stand 40%-60% Gloss Midnight Black,
Bezel and Stand 40%-60% Gloss Midnight Black, Bezel and Stand
Stand Detachable (included) Detachable (included)
Speakers Integrated Integrated
Remote Standard, Philips, 35-button Standard, Philips, 35-button
Wall mounts Optional/recommended Optional/recommended
Accessories
Media Center/DEC Optional/recommended Optional/recommended
Power supply 120VAC 60Hz 120VAC 60Hz
Power consumption (W) 300W 330W
Dimensions with stand
(H/W/D) (inches/centimeter) 28.5 (72.4) x 40.0 (101.6) x 11.0
(27.9) 31.7 (80.5) x 44.4(112.8) x 11.0 (27.9)
Dimensions without stand
(H/W/D) (inches/centimeter) 26.6 (67.6) x 40.0 (101.6) x 5.3
(13.5) 29.3 (74.4) x 44.4 (112.8) x 5.4 (13.7)
Weight (with stand) 61.6 lb/28 kg 75.9 lb/24 kg
Weight (without stand) 52.8 lb/24 kg 66.0 lb/30 kg
VESA wall mount standard VESA 200mm VESA 200mm
Energy Star Yes Yes
General
Front Bezel Trademarks Dolby Digital, e-Star (on top) Dolby Digital, e-Star (on top)
Regulatory
compliance Safety FCC Class B, C-UL and UI FCC Class B, C-UL and UI

HP High-Definition LCD TV Service Manual 11
I/O Connectors
Name Description
HDMI Digital High Definition Input Video Input Connector with HDCP — Type A
•HDMI 1 (with HDMI audio in L and R)
•HDMI 2
•HDMI 3
Audio L and R must be set to PCM at the source across HDMI.
VGA VGA monitor input with audio L/R (line in)
Audio Output •Digital (Optical) in Dolby Digital or PCM format) (S/PDIF)
•Audio Output L and R stereo analog (RCA)
ANT/Cable in (RF input) 75-ohm unbalanced, F-type for VHF/UHF/CATV in
Component High Definition Input •1: Y, Pb, and Pr, and audio L and R
•2: Y, Pb, and Pr, and audio L and R
Serial RS-232 Serial input (Commercial use only)
Standard Definition Input •AV Input 1: S-Vid, Video, and Audio L and R
•AV Input 2: S-Vid, Video, and Audio L and R
Service Port USB (For firmware upgrade use)
Factory Preset Display Modes
Preset Pixel format
Horizontal
frequency
(kHz) Horizontal polarity
Vertical
frequency
(Hz) Vertical polarity Pixel Clk (MHz) Source
1 640 x 480 31.469 –59.940 –25.175 VGA
2 640 x 480 37.500 –75.000 –31.500 VESA
3 720 x 400 31.469 –70.087 + 28.322 VGA
4 800 x 600 37.879 + 60.317 + 40.000 VESA
5 800 x 600 46.875 + 75.000 + 49.500 VESA
6 1024 x 768 48.363 –60.004 –65.000 VESA
7 1024 x 768 56.476 –70.069 –75.000 VESA
8 1024 x 768 60.023 –75.029 –78.750 VESA
9 1280 x 768 47.396 + 59.995 –68.250 VESA
10 1280 x 1024 63.981 + 60.020 + 108.000 VESA
11 1366 x 768 47.712 + 60.015 + 85.500 VESA
12 1920 x 1080 65.000 + 30.000 + 74.250 EIA

12 HP High-Definition LCD TV Service Manual
Controlling the Onscreen Display
The onscreen display (OSD) is controlled by using the remote control or the bezel buttons on the left side of the TV.
The TV indicators (Aand B) are located on the front of the TV.
TV Indicators and Controls
POWER Power button turns on the TV or places it in standby mode.
MENU Menu displays the onscreen display (OSD) or closes the OSD menu.
SELECT SELECT starts the Auto Sync function for a connected PC signal. In an OSD
menu, selects the highlighted item in the OSD.
SOURCE Source (SRC) selects the input Menu. In an OSD menu, this functions as a back
button or moves you up one item or menu level.
+CH
–CH
Channel (CH) selects the next or previous channel. In an OSD menu, press these
buttons to move up or down in the menu.
+VOL
–VOL
Volume (VOL) raises or lowers the sound level. In an OSD menu, press these
buttons to move right or left in the menu or to adjust an item.
A - LED
Indicator Amber: TV is powering on (light turns off after about 30 seconds).
HPAqua Blue: TV is off but plugged into the power source.
No light: TV is on or AC power cord is disconnected.
B - Remote
Control Sensor Receives the signal from the remote control.

HP High-Definition LCD TV Service Manual 13
Remote Control
(IR protocol: RC6)
Remote control Remote control button label Remote control function
Power Use to turn power on or place TV into standby mode.
SAP/MTS Turn secondary audio program on and off.
Sound Select audio mode: Voice, Music, Standard, User.
Picture Select video mode: Vivid, Standard, Movie, or User.
Source Display list of input source.
Menu Open and exit OSD menu.
Arrows Move cursor left/right/up/down in the OSD menu or adjust
a selected item
OK Choose the current menu option.
Aspect Change the image aspect ratio.
Back Go up one menu level when the OSD is displayed.
Info Display channel information about your current TV
program.
Volume Turn volume up and down.
Last Go back to the previous channel.
Mute Turn the sound on and off.
Ch+/Ch- Move the channels up and down.
CC Display the closed caption content.
Sleep Display the sleep timer (15, 30, 60, 90,120 minutes).
Fav Shows Favorite channel list and allows adding current
channel to the list and allows replacing one from the list
with current channel.
Numeric keypad Enter channel number.
_ (Dash) Enter a dash for a subchannel number of a digital channel.
Enter Select desired channel after entering the channel number
with the numeric keypad.

14 HP High-Definition LCD TV Service Manual
TV Connectors
The connectors listed in the table following the images are located on the right and left sides and back of the TV.
While only one model is shown below, all four models (LT3200, LT3700, LT4200, LT4700) use the same connector
configurations.