LG 47LF7700-ZC User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS :
MODEL : 47LF7700 47LF7700-ZC
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only
Printed in KoreaP/NO : MFL42349004 (0903-REV00)

Copyright © 2009 LG Electronics. Inc. All right reserved. -2- LGE Internal Use Only
Only for training and service purposes
CONTENTS
CONTENTS .......................................................................................2
PRODUCT SAFETY ................................................................................3
SPECIFICATION ......................................................................................6
ADJUSTMENT INSTRUCTION .............................................................14
TROUBLE SHOOTING ..........................................................................23
BLOCK DIAGRAM..................................................................................31
WIRING DIAGRAM.................................................................................32
EXPLODED VIEW .................................................................................34
SCHEMATIC DIAGRAMME..................................................................

Copyright © 2009 LG Electronics. Inc. All right reserved. -3- LGE Internal Use Only
Only for training and service purposes
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film
Resistor, over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect
an electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the
AC plug prongs tied together and touch other ohm-meter lead in
turn to each exposed metallic parts such as antenna terminals,
phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩand 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE

Copyright © 2009 LG Electronics. Inc. All right reserved. -4- LGE Internal Use Only
Only for training and service purposes
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions
on page 4 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10% (by volume) Acetone and 90% (by
volume) isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors
and semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500。F to 600。F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle(0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500。F to 600。F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500。F to 600。F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

Copyright © 2009 LG Electronics. Inc. All right reserved. -5- LGE Internal Use Only
Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing
the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of the
two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repai
r
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the
good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

Copyright © 2009 LG Electronics. Inc. All right reserved. -6- LGE Internal Use Only
Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application Range. 3. Test method
This spec sheet is applied to the 32"/37"/42"/47” LCD TV used
LF7700 chassis. 3.1 Performance : LGE TV test method followed.
3.2 Demanded other specification
2. Specification Safety : CE, IEC specification
Each part is tested as below without special appointment EMC : CE, IEC
2.1 Temperature : 25±5°C(77±9°F), CST : 40±5°C
2.2 Relative Humidity : 65±10%
2.3 Power Voltage : Standard input voltage
(100~240V@ 50/60Hz)
• Standard Voltage of each products is marked by models
2.4 Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM .
2.5 The receiver must be operated for about 5 minutes prior to
the adjustment.
4. General Specification
No Item Specification Remark
1 Display Screen Device 32”/37”/42”/47" wide Color Display Module
2 Aspect Ratio 16:9
MAKER : 32” – LGD
37” – LGD
42” – LGD
47” – LGD
3 Operating Environment Temp. : 5 ~ 35 deg
Humidity : 10 ~ 90% LGE SPEC.
4 Storage Environment Temp. : -20 ~ 50 deg
Humidity : 10 ~ 90 %
5 Input Voltage AC100 ~ 240V, 50/60Hz
6 Power Consumption
Power ON
32” 180W
37” 190W
42” 230W
47” 310W
7 Module Size
32” 760.0(H) x 450.0(V) x 48.0(D)
37” 877.0(H) x 516.8(V) x 46.9(D)
42” 983.0(H) x 576.0(V) x 46.0(D)
47” 1096.0(H) x 640.0(V) x 46.0(D)
8 Pixel Pitch
32” 0.36375(H) x 0.36375(V)
37” 0.42675(H) x 0.42675(V)
42” 0.48450(H) x 0.48450(V)
47” 0.54150(H) x 0.54150(V)
9 Back Light
32” EEFL
37” EEFL
42” EEFL
47” CCFL
10 Display Colors 10-bit(D), 1.06 Billion Color
11 Coating 3H, AG

Copyright © 2009 LG Electronics. Inc. All right reserved. -7- LGE Internal Use Only
Only for training and service purposes
5. MODEL General Specification
No Item Specification Remark
1 Broadcasting system
1) PAL-I
2) DVB-T
3) DVB-S/S2
2 Receiving system Analog : Upper Heterodyne
Digital : DVB-T(COFDM), DVB-S/S2
3 SCART Jack (2EA) PAL, SECAM
SCART1 Jack is Full SACRT and support
RF-OUT(TV-OUT)
SCART2 jack is Half SCART and support
MNT-OUT
4 Video Input RCA(1EA) PAL, SECAM, NTSC Side
5 Component Input (1EA) Y/Cb/Cr
Y/Pb/Pr
6 RGB Input RGB-PC Analog(D-SUB 15PIN)
7 HDMI Input (3EA)
HDMI1-DTV/DVI
HDMI2-DTV
HDMI3-DTV
PC(HDMI version 1.3)
Support HDCP
8 Audio Input (3EA) L/R Input
9 SDPIF out (1EA) In digital mode only
10 Headphone out(1EA) Side
11 Ethernet(1EA)
12 USB(2EA)
JPEG, MP3, Side
Service Only Rear
13 PCMCIA(1EA) CI(CAM Interface) Side

Copyright © 2009 LG Electronics. Inc. All right reserved. -8- LGE Internal Use Only
Only for training and service purposes
6. Chroma & Brightness
6.1 32"LCD Module
No Item Min Typ Max Unit Remark
1 Luminance, white
Luminance
(white) 400 500 - cd/m²
PSM : Vivid, CSM : Cool,
White(100 IRE)
Dynamic contrast : off
Dynamic color L off
Variation 1.3
2 View angle (R/L, U/D) 178/178 - degree
3 Contrast ratio 900 1300 -
4 Color Coordinate
White
X
Typ.
-0.03
0.279
Typ.
+0.03
PSM : Vivid, CSM : Cool,
White(80 IRE)
Dynamic contrast : off
Dynamic color L off
Y 0.292
Red
X 0.638
Y 0.334
Green
X 0.291
Y 0.607
Blue
X 0.145
Y 0.062
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable for approximately 30 minutes in a dark environment at 25±2_
3) The values specified are at approximate distance 50Cm from the LCD surface
4) Ta= 25±2°C, VLCD=12.0V, fV=60Hz, Dclk=72.4MHz VBR_A=1.65V, ExtVBR_B=100%
6.2 37"LCD Module
No Item Min Typ Max Unit Remark
1 Luminance, white
Luminance
(white) 400 500 - cd/m²
PSM : Vivid, CSM : Cool,
White(100 IRE)
Dynamic contrast : off
Dynamic color L off
Variation 1.3
2 View angle (R/L, U/D) 178/178 - degree
3 Contrast ratio 1000 1400 -
4 Color Coordinate
White
X
Typ.
-0.03
0.279
Typ.
+0.03
PSM : Vivid, CSM : Cool,
White(80 IRE)
Dynamic contrast : off
Dynamic color L off
Y 0.292
Red
X 0.639
Y 0.334
Green
X 0.289
Y 0.606
Blue
X 0.145
Y 0.065
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable for approximately 30 minutes in a dark environment at 25±2_
3) The values specified are at approximate distance 50Cm from the LCD surface
4) Ta= 25±2°C, VLCD=12.0V, fV=60Hz, Dclk=72.4MHz VBR_A=1.65V, ExtVBR_B=100%

Copyright © 2009 LG Electronics. Inc. All right reserved. -9- LGE Internal Use Only
Only for training and service purposes
6.3 42"LCD Module
No Item Min Typ Max Unit Remark
1 Luminance
Luminance
(white) 400 500 - cd/m²
PSM : Vivid, CSM : Cool,
White(100 IRE)
Dynamic contrast : off
Dynamic color L off
Variation 1.3
2 View angle (R/L, U/D) 178/178 - degree
3 Contrast ratio 1000 1400
4 Color Coordinate
White
X
Typ.
-0.03
0.279
Typ.
+0.03
PSM : Vivid, CSM : Cool,
White(80 IRE)
Dynamic contrast : off
Dynamic color L off
Y 0.292
Red
X 0.636
Y 0.334
Green
X 0.290
Y 0.608
Blue
X 0.145
Y 0.064
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable for approximately 30 minutes in a dark environment at 25±2_
3) The values specified are at approximate distance 50Cm from the LCD surface
4) Ta= 25±2°C, VLCD=12.0V, fV=60Hz, Dclk=72.4MHz VBR_A=1.65V, ExtVBR_B=100%
6.4 47"LCD Module
No Item Min Typ Max Unit Remark
1 Luminance, white
Luminance
(white) 400 500 - cd/m²
PSM : Vivid, CSM : Cool,
White(100 IRE)
Dynamic contrast : off
Dynamic color L off
Variation 1.3
2 View angle (R/L, U/D) 178/178 - degree
3 Contrast ratio 900 1300 -
4 Color Coordinate
White
X
Typ.
-0.03
0.279
Typ.
+0.03
PSM : Vivid, CSM : Cool,
White(80 IRE)
Dynamic contrast : off
Dynamic color L off
Y 0.292
Red
X 0.636
Y 0.334
Green
X 0.290
Y 0.608
Blue
X 0.145
Y 0.064
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable for approximately 30 minutes in a dark environment at 25±2_
3) The values specified are at approximate distance 50Cm from the LCD surface
4) Ta= 25±2°C, VLCD=12.0V, fV=60Hz, Dclk=72.4MHz VBR_A=1.65V, ExtVBR_B=100%

Copyright © 2009 LG Electronics. Inc. All right reserved. -10- LGE Internal Use Only
Only for training and service purposes
7. SET Optical Feature
(Measurement Condition: Full white/ User Mode : Contrast[100], Brightness[50], Color Temp[Normal], Back Light[100])
ÆMeasure the black luminance after 30 seconds.
No Item Module
Luminance (cd/m2) C/R(min)
Remark
AV, COMPONENT, HDMI AV, COMPONENT, HDMI
1 32 inch LPL 450 1200
2 37 inch LPL 450 1200
3 42 inch LPL 450 1200
4 47 inch LPL 450 1200
8. Component Video Input (Y, PB, PR)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remark
1 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
2 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
3 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I)
50Hz
4 720*480 31.47 59.94 27.000 SDTV 480P
5 720*480 31.50 60.00 27.027 SDTV 480P
6 720*576 31.25 50.00 27.000 SDTV 576P 50Hz
7 1280*720 44.96 59.94 74.176 HDTV 720P
8 1280*720 45.00 60.00 74.250 HDTV 720P
9 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
10 1920*1080 33.72 59.94 74.176 HDTV 1080I
11 1920*1080 33.75 60.00 74.250 HDTV 1080I
12 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,
13 1920×1080 56.25 50 148.50 HDTV 1080P
14 1920×1080 67.5 60 148.50 HDTV 1080P

Copyright © 2009 LG Electronics. Inc. All right reserved. -11- LGE Internal Use Only
Only for training and service purposes
9. RGB PC
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Remark
1. 720*400 31.468 70.08 28.32
2. 640*480 31.469 59.94 25.17 VESA
3. 800*600 37.879 60.31 40.00 VESA
4. 1024*768 48.363 60.00 65.00 VESA(XGA)
5. 1280*768 47.78 59.87 80.125 VESA(WXGA)
6 1360*768 47.72 59.80 84.625 VESA(WXGA)
7 1280*1024 63.98 60.02 108. SXGA
8 1400*1050 65.317 59.979 121.75 SXGA
9. 1920*1080 66.587 59.934 138.5 WUXGA
10. HDMI Input (DTV)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remark
1 640*480 31.649 59.94 25.175 SDTV 480p 60Hz
2 640*480 31.469 60 25.20 SDTV 480p 60Hz
3 720*480 31.47 59.94 27.00 SDTV 480p 60Hz
4 720*480 31.50 60 27.027 SDTV 480p 60Hz
5 720*576 31.25 50.00 27.00 SDTV 576p 50Hz
6 1280*720 37.50 50.00 74.176 HDTV 720p 50Hz
7 1280*720 44.96 59.94 74.176 HDTV 720p 60Hz
8 1280*720 45.00 60 74.250 HDTV 720p 60Hz
9 1920*1080 28.125 50.00 74.250 HDTV 1080i 50Hz
10 1920*1080 33.72 59.94 74.176 HDTV 1080i 60Hz
11 1920*1080 33.75 60 74.250 HDTV 1080i 60Hz
12 1920*1080 27.00 24.00 74.25 HDTV 1080p 24Hz
13 1920*1080 33.750 30 74.25 HDTV 1080p 30Hz
14 1920*1080 56.25 50.00 148.50 HDTV 1080p 50Hz
15 1920*1080 67.433 59.94 148.352 HDTV 1080p 60Hz
16 1920*1080 67.50 60 148.50 HDTV 1080p 60Hz

Copyright © 2009 LG Electronics. Inc. All right reserved. -12- LGE Internal Use Only
Only for training and service purposes
11. HDMI Input (PC Mode)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1. 720*400 31.468 70.08 28.32 HDCP
2. 640*480 31.469 59.94 25.17 VESA HDCP
3. 800*600 37.879 60.31 40.00 VESA HDCP
4. 1024*768 48.363 60.00 65.00 VESA(XGA) HDCP
5. 1280*768 47.78 59.87 80.125 VESA(WXGA) HDCP
6 1360*768 47.72 59.80 84.625 VESA(WXGA) HDCP
7 1280*1024 63.98 60.02 108. SXGA HDCP
8 1400*1050 65.317 59.979 121.75 SXGA HDCP
9. 1920*1080 66.587 59.934 138.5 WUXGA HDCP

Copyright © 2009 LG Electronics. Inc. All right reserved. -13- LGE Internal Use Only
Only for training and service purposes
12. Mechanical specification
12-1. 32LF7700-ZC
12-2. 37LF7700-ZC
12-3. 42LF7700-ZC
12-4. 47LF7700-ZC
No. Item Content Unit Remark
1. Product
Dimension
Width (W) Length (D) Height (H) mm
Before Packing 797.0 227.3 597.0 mm With Stand
After Packing 986.0 193.0 665.0
mm Box Out Size
2. Product
Weight
Only SET 13.0 Kg With Stand
With BOX 15.2 Kg
No. Item Content Unit Remark
1. Product
Dimension
Width (W) Length (D) Height (H) mm
Before Packing 918.6 293.8 684.8
mm With Stand
After Packing 1015.0 253.0 881.0 mm Box Out Size
2. Product
Weight
Only SET 17.3 Kg With Stand
With BOX 21.1 Kg
No. Item Content Unit Remark
1. Product
Dimension
Width (W) Length (D) Height (H) mm
Before Packing 1026.2 293.8 734.0
mm With Stand
After Packing 1330.0 257.0 772.0 mm Box Out Size
2. Product
Weight
Only SET 20.3
With BOX 25.3
No. Item Content Unit Remark
1. Product
Dimension
Width (W) Length (D) Height (H) mm
Before Packing 1140.4 342.9 820.1
mm With Stand
After Packing 1266.0 460.0 887.0 mm Box Out Size
2. Product
Weight
Only SET 27.0 Kg With Stand
With BOX 33.0 Kg

Copyright © 2009 LG Electronics. Inc. All right reserved. -14- LGE Internal Use Only
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. USB DOWNLOAD
To update the system software, use only the “USB IN SERVICE ONLY” jack on the rear of the TV.
Otherwise you will fail to update.
(The USB IN jack on the side of the TV works for the music or photo service.)
1-1) sub Micom & TV Software Download
a) Put the “hmx_lf7700.hdf” in the USB.
b) Connect the USB device to the “USB IN” jack on the side of the TV.
32LF7700-ZC, 37LF7700-ZC 42LF7700-ZC, 47LF7700-ZC
c) Power Off and Power On.
d) Waiting until the new software upgrade is finished.
e) Fishing the version uploading, you have to put USB stick and “AC Power” off.
f) After putting “AC Power” on and check updated version on your TV.
zIf downloading version is more high than your TV have, TV can lost all channel data.
In this case, you have to channel recover.
if all channel data is cleared, you didn’t have a DTV/ATV test on production line.

Copyright © 2009 LG Electronics. Inc. All right reserved. -15- LGE Internal Use Only
Only for training and service purposes
1-2) Freesat Software Download
a) Put the “lf7700_upgrade.hdf” in the USB.
b) Connect the USB device to the “USB IN”(Service Only) jack on the Rear service.
c) Power Off and Power On.
d) Waiting until the new software upgrade is finished.
e) Fishing the version uploading, you have to put USB stick and “AC Power” off.
f) After putting “AC Power” on and check updated version on your TV.
zIf downloading version is more high than your TV have, TV can lost all channel data.
In this case, you have to channel recover.
if all channel data is cleared, you didn’t have a DTV/ATV test on production line.
32LF7700, 37LF7700
42LF7700, 47LF7700

Copyright © 2009 LG Electronics. Inc. All right reserved. -16- LGE Internal Use Only
Only for training and service purposes
2. OTA DOWNLOAD
2-1) Freesat Software OTA Download.
Auto update case.
a) Click the Software Update.
b) Click the Auto Update.
c) If found, the OTA detection message is shown.
c-1) Select “Yes”.
c-2) The TV is reboot and OTA process starts.
c-3) Select “No”
c-4) OTA process does not start.
d) The TV is reboot and OTA process starts.
e) If not, the OTA not detection message is shown.
Manual Update Case.
a) Click the Software Update.
b) Click the Manual Update.
c) Change Frequency, Polarization, Symbol Rate, FEC for OTA TP.
d) Click “Search” button
e) If found, the OTA detection message is shown.
e-1) Select “Yes”.
e-2) The tv is reboot and OTA process starts.
e-3) Select “No”
e-4) OTA process does not start.
f) The TV is reboot and OTA process shows.
g) If not , the OTA not detection message is shown.

Copyright © 2009 LG Electronics. Inc. All right reserved. -17- LGE Internal Use Only
Only for training and service purposes
2-2) Freeview Software OTA Download.
Auto update case.
a) Click the Software Update.
b) Click the Auto Update.
c) If found, the OTA detection message is shown.
c-1) Select “Yes”.
c-2) The TV is reboot and OTA process starts.
c-3) Select “No”
c-4) OTA process does not start.
d) The TV is reboot and OTA process starts.
e) If not, the OTA not detection message is shown.
Manual Update Case.
a) Click the Software Update.
b) Click the Manual Update.
c) If found, the OTA detection message is shown.
e-1) Select “Yes”.
e-2) The tv is reboot and OTA process starts.
e-3) Select “No”
e-4) OTA process does not start.
d) The TV is reboot and OTA process shows.
e) If not , the OTA not detection message is shown.

Copyright © 2009 LG Electronics. Inc. All right reserved. -18- LGE Internal Use Only
Only for training and service purposes
3. EDID DOWNLOAD
3-1. Panel Setting
a) You should change the panel size by going to the Factory Mode, press “Menu”, “1”, “2”, “4”, 7” and “5” keys on a
remote.
b) You have to select 32”, 37” or 42”, 47” panel in Factory mode.
32LF7700-ZC : Panel Select Æ“LG_1080P_LC320WUN_50” 37LF7700-ZC : Panel Select Æ“LG_1080P_LC370WUE_50”
42LF7700-ZC : Panel Select Æ“LG_1080P_LC420WUF_100” 47LF7700-ZC : Panel Select Æ“LG_1080P_LC470WUF_100”

Copyright © 2009 LG Electronics. Inc. All right reserved. -19- LGE Internal Use Only
Only for training and service purposes
3-2. EDID Setting
a) You should change the panel size by going to the Factory Mode, press “Menu”, “1”, “2”, “4”, 7” and “5” keys on a
remote.
b) You have to select “Engineering Menu” in Factory mode.
c) Enter “ EDID Download” by pushing “OK” key.
32LF7700-ZC
(Factory mode ÆEngineering menu ÆEDID Download select)
37LF7700-ZC
(Factory mode ÆEngineering menu ÆEDID Download select)
42LF7700-ZC
(Factory mode ÆEngineering menu ÆEDID Download select)
47LF7700-ZC
(Factory mode ÆEngineering menu ÆEDID Download select)

Copyright © 2009 LG Electronics. Inc. All right reserved. -20- LGE Internal Use Only
Only for training and service purposes
3-3. PC EDID Table
a) 32LF7700-ZC
00 FF FF FF FF FF FF 00 1E 6D Product IDⓐSerial Noⓑ
Week/Yearⓒ01 03 80 46 27 78 2A 60 00 A3 55 4A 9B 25
0F 47 4A A1 08 00 31 40 45 40 61 40 01 01 90 40
81 80 01 01 01 01 1A 36 80 A0 70 38 1F 40 30 20
35 00 BA 88 21 00 00 1A 16 21 50 A0 51 00 1E 30
48 88 35 00 BA 88 21 00 00 1C 00 00 00 FD 00 39
3E 1F 54 12 00 0A 20 20 20 20 20 20
Model Nameⓓ00 C/Sⓔ
b) 37LF7700-ZC
00 FF FF FF FF FF FF 00 1E 6D Product IDⓐSerial Noⓑ
Week/Yearⓒ01 03 80 46 27 78 2A 60 00 A3 55 4A 9B 25
10 47 4A A1 08 00 31 40 45 40 61 40 01 01 90 40
81 80 01 01 01 01 1A 36 80 A0 70 38 1F 40 30 20
35 00 33 CC 31 00 00 1A 16 21 50 A0 51 00 1E 30
48 88 35 00 33 CC 31 00 00 1C 00 00 00 FD 00 39
3E 1F 54 12 00 0A 20 20 20 20 20 20
Model Nameⓓ00 C/Sⓔ
c) 42LF7700-ZC
00 FF FF FF FF FF FF 00 1E 6D Product IDⓐSerial Noⓑ
Week/Yearⓒ01 03 80 46 27 78 2A 60 00 A3 55 4A 9B 24
10 47 4A A1 08 00 31 40 45 40 61 40 01 01 90 40
81 80 01 01 01 01 1A 36 80 A0 70 38 1F 40 30 20
35 00 A2 0B 32 00 00 1A 16 21 50 A0 51 00 1E 30
48 88 35 00 A2 0B 32 00 00 1C 00 00 00 FD 00 39
3E 1F 54 12 00 0A 20 20 20 20 20 20
Model Nameⓓ00 C/Sⓔ
d) 47LF7700-ZC
00 FF FF FF FF FF FF 00 1E 6D Product IDⓐSerial Noⓑ
Week/Yearⓒ01 03 80 46 27 78 2A 60 00 A3 55 4A 9B 25
10 47 4A A1 08 00 31 40 45 40 61 40 01 01 90 40
81 80 01 01 01 01 1A 36 80 A0 70 38 1F 40 30 20
35 00 10 49 42 00 00 1A 16 21 50 A0 51 00 1E 30
48 88 35 00 10 49 42 00 00 1C 00 00 00 FD 00 39
3E 1F 54 12 00 0A 20 20 20 20 20 20
Model Nameⓓ00 C/Sⓔ
ⓐProduct ID
MODEL NAME PRODUCT ID HEX EDID Table
32LF7700-ZC 30383 76AF AF76
37LF7700-ZC 30375 76A7 A776
42LF7700-ZC 40440 9DF8 F89D
47LF7700-ZC 30373 76A5 A576
ⓑSerial No: Controlled on production line.
ⓒWeek, Year: Controlled on production line: ex) Weekly : ‘01’ Α01’ , Year : ‘2009’ Î’13’
ⓓModel Name(Hex):
MODEL NAME MODEL NAME(HEX)
32LF7700-ZC 00 00 00 FC 00 33 32 4C 46 37 37 30 30 0A 20 20 20 20
37LF7700-ZC 00 00 00 FC 00 33 37 4C 46 37 37 30 30 0A 20 20 20 20
42LF7700-ZC 00 00 00 FC 00 34 32 4C 46 37 37 30 30 0A 20 20 20 20
47LF7700-ZC 00 00 00 FC 00 34 37 4C 46 37 37 30 30 0A 20 20 20 20
ⓔChecksum: Changeable by total EDID data.