Hisense LHD4007EU User manual

Liquid Crystal Display Television
Service Manual
Chassis：MT5331
Product Type：LHD4007EU
Ver 1.0
Hisense Electric Co.，Ltd.
Aug. 2007

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Contents
Contents................................................................................................................................................................- 2 -
Service Manual ....................................................................................................................................................- 3 -
1. Precautions and notices..............................................................................................................................- 3 -
1.1 WARNING ......................................................................................................................................- 4 -
1.2 NOTES ............................................................................................................................................- 7 -
2. Product Function Specifications ..............................................................................................................- 10 -
2.1 Product Function............................................................................................................................- 10 -
2.2 Specifications.................................................................................................................................- 12 -
3. LCD Panel Spec.......................................................................................................................................- 13 -
3.1 General Description .......................................................................................................................- 13 -
3.2 General Features ............................................................................................................................- 13 -
4. Chassis Layout and Overall Wiring Diagrams ........................................................................................- 15 -
4.1 Chassis Layout...............................................................................................................................- 15 -
4.2 Main BD ........................................................................................................................................- 16 -
4.3 Wires and Cables Overall Wiring Diagrams .................................................................................- 17 -
5. Factory/Service OSD Menu and Adjustment...........................................................................................- 18 -
5.1 To enter the Factory OSD Menu ....................................................................................................- 18 -
5.2 Factory OSD Menu........................................................................................................................- 18 -
5.3 Designer Menu...............................................................................................................................- 21 -
6. Software Upgrading.................................................................................................................................- 28 -
6.1 Get ready for upgrading.................................................................................................................- 28 -
6.2 Upgrading with the MtkTool .........................................................................................................- 30 -
7. Troubleshooting .......................................................................................................................................- 34 -
7.1 Troubleshooting for Remote Control.............................................................................................- 34 -
7.2 Troubleshooting for Function Key.................................................................................................- 35 -
7.3 TV won’t Power On.......................................................................................................................- 36 -
7.4 Troubleshooting for Audio.............................................................................................................- 37 -
7.5 Troubleshooting for TV/VGA/HDMI input...................................................................................- 38 -
7.6 Troubleshooting for YPbPr input...................................................................................................- 39 -
7.7 Troubleshooting for Video/S-Video/Scart input ............................................................................- 40 -
8. Explode View and BOM..........................................................................................................................- 41 -
9. Schematic circuit diagram .......................................................................................................................- 42 -

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Service Manual
1. Precautions and notices
BEFORE SERVICING THE LCD TV, 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 Hisense
Electric Co., Ltd Equipment. The service procedures recommended by Hisense and
described in this Service Guide are effective methods of performing service
operations. Some of these service operations require the use of tools specially
designed for the purpose. The special tools should be used when and as
recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES
which should be carefully read in order to minimize the risk of personal injury to
service personnel. The possibility exists that improper service methods may damage
the equipment. It is also important to understand that these CAUTIONS and
NOTICES ARE NOT EXHAUSTIVE. Hisense 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, Hisense has

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not undertaken any such broad evaluation. Accordingly, a serviceman that uses a
service procedure or tools, which are not recommended by Hisense, must first satisfy
himself thoroughly that neither his safety nor the safe of the equipment will be
jeopardized by the service method selected.
Hereafter throughout this manual, Hisense Electric Co., Ltd will be referred to as
Hisense.
1.1 WARNING
1.1.1
Critical components having special safety characteristics are identified with a by
the Ref. No. in the parts list. 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 Hisense. Hisense assumes no liability, express or implied,
arising out of any unauthorized modification of design. Serviceman assumes all
liability.
DANGERCAUTION CAUTION
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY
ORIGINAL MANUFACTURER'S REPLACEMENT PARTS, WHICH ARE LISTED WITH
THEIR PART NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE GUIDE.

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1.1.2.
All ICs and many other semiconductors are susceptible to electrostatic discharges
(ESD). Careless handling during repair can reduce life drastically. 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.
1. Never replace modules or other components while the unit is switched on.
2. When making settings, use plastic rather than metal tools. This will prevent
any short circuits and the danger of a circuit becoming unstable.
1.1.3
To prevent electrical shock, do not use this 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 wide blade or plug to wide slot, fully insert.
1.1.4
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.
1.1.5
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 wire trees should be routed correctly and fixed with the mounted

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cable clamps.
-The insulation of the mains lead should be checked for external damage.
1.1.6
(1) Do not touch Signal and Power Connector while this product operates. Do not
touch EMI ground part and Heat Sink of Film Filter.
(2) Do not supply a voltage higher than that specified to this product. This may
damage the product and may cause a fire.
(3) 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 no satisfy the specified
environmental conditions. This may damage the product and may cause a fire.
(4) 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.
(5) If the product emits smoke, and abnormal smell, or makes an abnormal sound,
immediately turn off the power. Continuing to use the product, it may cause fire or
electric shock.
(6) 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.

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(7) Do not pull out or insert the power cable from/to an outlet with wet hands. It
may cause electric shock.
(8) Do not damage or modify the power cable. It may cause fire or electric shock.
(9) If the power cable is damaged, or if the connector is loose, do not use the
product: otherwise, this can lead to fire or electric shock.
(10) If the power connector or the connector of the power cable becomes dirty or
dusty, wipe it with a dry cloth. Otherwise, this can lead to fire.
(11) 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.
1.2 NOTES
Notes on Safe Handling of the LCD panel and during service
The work procedures shown with the Note indication 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 working space.
• 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 board, start servicing at least 2 minutes after the main power has

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been turned off.
• While the main power is on, do not touch any parts or circuits other than the ones
specified. 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 in, and removing it from the packing carton, be
sure to have at least two persons perform the work.
• When the surface of the panel comes into contact with the cushioning materials, be
sure to confirm that there is no foreign matter on top of the cushioning materials
before the surface of the panel comes into contact with the cushioning materials.
Failure to observe this precaution may result in, the surface of the panel being
scratched by foreign matter.
• When handling the circuit board, 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 as the heat sink or
transformer. Failure to observe this precaution may result in the occurrence of an
abnormality in the soldered areas.
• 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 of the wires and fixing them in position must be done in accordance with

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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.
The lightning flash with arrowhead symbol, within an equilateral
triangle is intended to alert the user to the presence of uninsulated
dangerous voltage within the products enclosure that may be of sufficient magnitude
to constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the set.

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2. Product Function Specifications
2.1 Product Function

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B1
C2

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2.2 Specifications
Native Resolution: 1366×768 Pixels (Corresponding to WXGA)
ColorSystem: PAL/SECAM
Sound System: B/G, D/K, I, L/L’
Tuner: VHF/UHF:48.25~863.25MHz
Antenna: 75ΩVHF/UHF input
Stereo: NICAM/A2
VIDEO INPUT:
SCART-1 (Video and RGB) Video: 1 Vp-p, negative sync, 75Ωinput
RGB: 0.7 Vp-p, 75Ωinput
SCART-2 (Video) Video: 1 Vp-p, negative sync, 75Ωinput
Audioin StereoaudioinputforSCART1andSCART2
COMPONENT RCA, 0.7 Vp-p/75Ωinputs
(480I/60Hz, 480P/60Hz, 576I/50Hz, 576P/50Hz
720P/60Hz, 1080I/50,1080I/60Hz)
Audio in RCA Stereo audio input
PC INPUT:
VGA 15Pin,AnalogRGBsignal,0.7Vp-p,75Ωinput
(VGA, SVGA, XGA)
Audio in RCA Stereo audio input
MONITOROUT
Audio/VideoOutput SCART1:CANAL+
SpeakerOutput 7W+7W
Power Requirement AC 160 to 240V, 50/60Hz
PowerConsumption 265W
Dimensions (mm) 993(L) 310(D) 719(H)
Weight (gross) 30kg
Allowable temperature of operation environment 0℃to 40℃
ACCESSORIES
OperatingInstructions 1
RemoteControlUnit 1
PowerLead 1
DryCellBattery 2
NOTE: Specifications and design are subject to possible modifications without notice due to
improvements。

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3. LCD Panel Spec
3.1 General Description
LTA400WT-L17 is a color active matrix liquid crystal display (LCD) that uses
amorphous silicon TFT (Thin Film Transistor) as switching components. This
model is composed of a TFT LCD panel, a driver circuit and a back light unit.
The resolution of a 40.0” is 1366×768 and this model can display up to 16.7
million colors with wide viewing angle of 89°or higher in all directions. This
panel is intended to support applications to provide a excellent performance for
Flat Panel Display such as Home-alone Multimedia TFT-LCD TV, Display
terminals for AV application products, and High Definition TV (HDTV).
3.2 General Features
RoHS compliance(Pb-free)
High contrast ratio, high aperture ratio, fast response time
SPVA (Super Patterned Vertical Align ) mode
Wide viewing angle(±178°)
High speed response
WXGA(1366×768 pixels) resolution (16:9)
Low power consumption
Direct Type 16 CCFTs (Clod Cathode Fluorescent Tube)
DE(Data Enable) mode
LVDS (Low Voltage Differential Signaling) interface (1 pixel/clock)

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4. Chassis Layout and Overall Wiring Diagrams
4.1 Chassis Layout
No Description Part No
Type/Model
(1) Main BD 113578 RSAG2.908.1098-1\ROH
(2) Power BD 113197 RSAG2.908.982-3\ROH
(3) Scart BD 113544 RSAG2.908.1107\ROH
(4) Keypad PCA 112615 RSAG2.908.1030\ROH
(5) LED / IR Board 112829 RSAG2.908.1048\ROH

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4.2 Main BD
Location No. SPECIPICATION Description
J36 TJC10-3A\ROH Buttons (connect key BD and main
BD)
J35 TJC10-5A\ROH IR, LED
J14 TJC10-14A\ROH 5V,12V power
J34 TJC10-4A\ROH Power 14V from power BD
XP212 TJC3-4A\ROH Audio output
J38 TJC10-8A\ROH Video, S-video, Headphone out
J22 A2600WSO-2X9P\ROH Scart 2
J19 A2600WSO-2X11P\ROH Scart 1
J7 FF-HX19-10\ROH LVDS

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4.3 Wires and Cables Overall Wiring Diagrams
No DESCRIPTION SPECIPICATION NOTE
1 Main Power TJC2-3Y-400-2-B\ROH Power Inlet-->Power BD XP801
2 Back light power to panel HX-3006B550\ROH Power BD XP809<-->Panel
3 Power supply for amplifier TJC10T-4Y-250\ROH Power BD XP808<-->Main BD J34
4 5V,12V power and communication
between Main BD and power BD
TJC10T-4Y-250\ROH Power BD XP812<-->Main BD J14
5 LVDS signal HX-0137 Main BD J7<-->Panel
6 LED & IR TJC10T-5Y-350\ROH Main BD J35<--> Keypad BD
XPK03
7 Buttons TJC10T-3Y-800\ROH Main BD J36<--> LED&IR BD
XPR1
8 Audio out put (R/L) TJC3H-4Y-800-600\ROH Main BD XP212<-->Speaker L/R
9 Video input connection (Scart 1) HX-2022C500\ROH Main BD J38<-->XP0102
10 Video input connection (Scart 2) HX-2018C500\ROH Main BD J22<-->XP0101
11 Video input connection (video,
s-video) and headphone output
TJC10T-8Y-500\ROH Main BD J19<-->XP2

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5. Factory/Service OSD Menu andAdjustment
5.1 To enter the Factory OSD Menu
a. With factory RC (remote control)
1. Press “M” button and enter factory mode.
2. Press “Menu” button and enter factory OSD menu.
3. Press “CH+”/“CH-” button select the function menu, press “VOL+”/“VOL-” enter the
selected function menu. Press “VOL+”/“VOL-” button adjust values in the menu.
b. With user’s RC
1. Power TV On
2. Press Menu button and call up User OSD Menu
3. Select Sound-> Balance
4. Enter 0->5->3 ->2 in sequence.
Note: If necessary, re-do number keys.
5. Factory OSD appears.
5.2 Factory OSD Menu
5.2.1. White Balance
Item Default Value Range Note
124 CVBS 0-255
124 Composite 0-255
124 S-Video 0-255
124 SCART1 0-255
124 SCART2 0-255
125 VGA 0-255
114 Component1 0-255
114 Component2 0-255
122 HDMI1 0-255
1 R Gain
122 HDMI2 0-255
To adjust White
Balance, High
Brightness Red.
129 CVBS 0-255
129 Composite 0-255
129 S-Video 0-255
129 SCART1 0-255
129 SCART2 0-255
129 VGA 0-255
120 Component1 0-255
2 G Gain
120 Component2 0-255
To adjust White
Balance, High
Brightness Green.

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128 HDMI1 0-255
128 HDMI2 0-255
120 CVBS 0-255
120 Composite 0-255
120 S-Video 0-255
120 SCART1 0-255
120 SCART2 0-255
120 VGA 0-255
113 Component1 0-255
113 Component2 0-255
119 HDMI1 0-255
3 B Gain
119 HDMI2 0-255
To adjust White
Balance, High
Brightness Blue.
131 CVBS 0-255
131 Composite 0-255
131 S-Video 0-255
131 SCART1 0-255
131 SCART2 0-255
126 VGA 0-255
130 Component1 0-255
130 Component2 0-255
128 HDMI1 0-255
4 R Offset
128 HDMI2 0-255
To adjust White
Balance, Low
Brightness Red.
131 CVBS 0-255
131 Composite 0-255
131 S-Video 0-255
131 SCART1 0-255
131 SCART2 0-255
126 VGA 0-255
131 Component1 0-255
131 Component2 0-255
127 HDMI1 0-255
5 G Offset
127 HDMI2 0-255
To adjust White
Balance, Low
Brightness Green.
131 CVBS 0-255
131 Composite 0-255
131 S-Video 0-255
131 SCART1 0-255
131 SCART2 0-255
127 VGA 0-255
128 Component1 0-255
128 Component2 0-255
6 B Offset
128 HDMI1 0-255
To adjust White
Balance, Low
Brightness Blue.

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128 HDMI2 0-255
7 WBH
Brightness 60 0-100
Adjust high
brightness
temporarily
8 WBH
Contrast 60 0-100
Adjust high contrast
temporarily
9 WBH Color 60 0-100 Adjust high color
temporarily
10 WBL
Brightness 40 0-100
Adjust low
brightness
temporarily
11 WBL
Contrast 40 0-100
Adjust low contrast
temporarily
12 WBL Color 40 0-100 Adjust low color
temporarily
Note: Before adjusting, please change to desired source. Different source has different WB
values.
5.2.2. Set Channel
Item 备注
1 Zhong Shi Jiangxi Road factory
2 Huang Dao Huangdao Industrial Park
3 Gui Yang Gui Yang Industrial Park
4 Liao Ning Liao Ning Industrial Park
5 Hungary Hisense Hungary
6 Australia Hisense Australia
7 France Hisense France
5.2.3. Factory Option
Item Default Options Note
1 MODE M M, U
M-Can enter factory mode
with factory RC or user RC.
U-Can enter factory mode
only with user’s RC.
2 Test Time 5 1-30
Note: MODE “M” is only used for factory production.