Service Manual ...........................................................................................................................................................- 3 -
1. Precautions and notices.....................................................................................................................................- 3 -
3.2 General Features...................................................................................................................................- 13 -
4. Chassis Layout and Overall Wiring Diagrams...............................................................................................- 14 -
4.1 Boards and Chassis Layout...................................................................................................................- 14 -
4.2 Wires and Cables Overall Wiring Diagram(s)......................................................................................- 15 -
5. Factory/Service OSD Menu and Adjustment..................................................................................................- 16 -
5.1 T o enter the Factory OSD Menu...........................................................................................................- 16 -
5.4 T o Exit the Aging Mode........................................................................................................................- 19 -
6.1 Get ready for upgrading........................................................................................................................- 20 -
6.2 Upgrading with the MtkTool................................................................................................................- 22 -
7.1 Troubleshooting for Remote Control....................................................................................................- 26 -
7.2 Troubleshooting for Function Key........................................................................................................- 27 -
7.3 TV won’t Power On..............................................................................................................................- 28 -
7.4 Troubleshooting for Audio....................................................................................................................- 29 -
7.5 Troubleshooting for TV/VGA/HDMI input..........................................................................................- 30 -
7.6 Troubleshooting for YPbPr input..........................................................................................................- 31 -
7.7 Troubleshooting for Video/S-Video input.............................................................................................- 32 -
8. Explode View and Explode Bom List.............................................................................................................- 33 -
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 not undertaken any
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LCD TV Service Manual
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.
1.1.2.
All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD).
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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.
LCD TV Service Manual
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 cable
clamps.
-The insulation of the mains lead should be checked for external damage.
1.1.6
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(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,
LCD TV Service Manual
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.
(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.
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(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.
LCD TV Service Manual
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
been turned off.
• While the main power is on, do not touch any parts or circuits other than the ones
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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
LCD TV Service Manual
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 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
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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.
LCD TV Service Manual
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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LCD TV Service Manual
2. Product Function Specifications
2.1 Product Function
Front Cabinet
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Back Cabinet
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2.2 Specifications
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40LE45S 40LC45S
19201080
230W
Vid eoX2
S- VideoX1
Comp onent X2
HDMI X3
AV Aud io X 2
Comp onent Audio X 2
VGA Audio Input X 1
AV Aud io X 1
Opti cal Audio out x 1
Le ngth: 3 9 . 1 inches
Wi dth:1 2 . 2 inches
He ight: 28 .3 in che s
5 5 . 1 lbs
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LCD TV Service Manual
3. LCD Panel Spec
LTD42W29NUS:
Panel: LTA400HA07\JK\ROH SN:1051263
3.1General Description
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3.2 General Features
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LCD TV Service Manual
4. Chassis Layout and Overall Wiring Diagrams
4.1 Boards and Chassis Layout
No Description Part No. Type/Model PCB/ Model
(1)
(2)
(3)
Main board 120639 RSAG2.908.1375-7\ROH RSAG7.820.1525\VER.A\ROH
Power board 117734 RSAG2.908.1192-11\ROH RSAG7.820.1185\VER.E\ROH
AV board 113354 RSAG2.908.1232\ROH RSAG7.820.1342\VER.B\ROH
IR board 115138 RSAG2.908.1048\ROH RSAG7.820.1013\VER.A\ROH
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LCD TV Service Manual
4.2 Wires and Cables Overall Wiring Diagram(s)
No DESCRIPTION SPECIPICATION NOTE
LVDS signal HX2-2X20KLB350P-LG\ROH Main BDXP9<-->Panel
1
Audio out put (R/L) TJC3H-4Y-650-900\ROH Main BD XP8<-->Speakers
2
Buttons TJC10T-3Y-900\ROH Main BDXP12<--> Key BD XPK1
3
4
5
6
7
8
9
10-1
10-2
Led & IR
AV and S-video signal
Headphone signal
Series upgrade TJC10T-4Y-350\ROH Main BD XP7<-->AV BD XP03
Audio Amplifily TJC10T-4Y-250\ROH Power BD XP808<--> Main BD XP5
+5V, +12V supply to Main BD TJC10T-14Y-250\ROH Main BD XP3<-->Power BD XP812
Backlight Power HX-3005B450\ROH Power BD XP809<--> Panel left backlight port
Backlight Power HX-3004B550\ROH Power BD XP815<--> Panel right backlight port
TJC10T-5Y-900\ROH
HX-2026C550\ROH Main BD XP11<-->AV BD XP01
TJC3T-4Y-400\ROH Main BD XP10<-->AV BD XP02
Main BD XP13<-->IR &LED BD XPR01
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LCD TV Service Manual
5. Factory/Service OSD Menu and Adjustment
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 Audio-> Balance
4. Enter 0->5->3 ->2 in sequence.
Note: If necessary, re-do number keys.
5. Factory OSD appears.
6. Press Menu again and leave factory OSD.
5.2 Factory OSD Menu
5.2.1 White Balance
Note: Different source has different WB values. Before adjusting, please change to desired source.
1. Auto Color
For VGA and Component Video sources, WB values must be adjusted.
Before adjusting, prepare the signal instruments such as DVD or K-8256 first, and find the video picture
with gray and color bars. Then please change to desired source.
source Timing Pattern Notes
1 ADC VGA 1024*768gray-3color For VGA source
2 ADC HDTV 720P gray-3color For Component Video
Notes:
a、Press “M” button and enter factory mode.
b、Press “Menu” button and enter factory OSD menu.
c、Select the item “Auto Color”.
d、Press VOL+ button to auto color.
e、Close the OSD menu after 5 seconds.
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LCD TV Service Manual
5.2.2 Factory Option
Item Default Options Notes
M-Can enter factory mode
1 MODE M M, U
with factory RC or user RC.
U-Can enter factory mode
only with user’s RC.
Note: MODE “M” is only used for factory production.
5.2.3 Version Info
Item Default Options Note
1
2
Version
Date
Software version
The date of current version
Note: Software version info of the TV, readable only.
5.2.4 Clear the EEPROM
Item Meaning Note
Clean
Protected
Clean All Clear completely
Note: The factory menu date varies according to different sources. Incase changing the factory
data by error, you can choose to “Clean Protected”, by which you can resume the default value.
To clear the EEPROM:
a. Select the item “Clean All”.
b. Press VOL+ button to clear the EEPROM data.
c. Close the OSD menu after 5 seconds.
d. Restart the TV.
Clear partly
Clean data except
WB data and Auto Color data
Clean all data
5.3 Designer Menu
5.3.1 Video Mode
Standard:
TV AV S-Video ComponentVGA HDMI
R Gain 119 119 119 141 127 120
G Gain 125 125 125 145 120 122
B Gain 130 130 130 145 130 132
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Offset:
TV AV S-Video Component VGA HDMI
R Offset 116 116 116 121 124 120
G Offset 124 124 124 125 126 128
B Offset 124 124 124 125 127 128
Cool:
TV AV S-Video Component VGA HDMI
R Gain 119 119 119 141 127 120
G Gain 125 125 125 145 120 122
B Gain 145 145 145 160 145 147
Warm:
TV AV S-Video Component VGA HDMI
R Gain 134 134 134 156 142 135
G Gain 125 125 125 145 120 122
B Gain 130 130 130 145 130 132
LCD TV Service Manual
5.3.2 Video Curve:
TV AV S-Video Component VGA HDMI
Bright Max 600 650 650 700 700 650
Bright Min 0 0 0 0 0 0
Bright Mid 520 550 550 550 590 530
Contrast
Max
Contrast Min 0 0 0 0 0 0
Contrast Mid 500 480 480 460 440 470
If There is a red “M” moving on the screen, it means the TV is in Aging mode. To exit the
Aging mode, use your user RC, and enter 8->0->8 ->7 in sequence.
The above “Factory/Service OSD Menu” are reference only, please refer to the actual units
to determine the appearances.
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LCD TV Service Manual
6. Software Upgrading
The software is upgraded by a burning toll-MtkTool, which can burn the program file *.bin to the
main board of the unit.
6.1 Get ready for upgrading
6.1.1 Install the driver
Double click the icon , install the driver.
Select the default value, the driver will be installed step by step.
6.1.2 Hardware connecting
Connect the unit to your pc with a USB-to-serial port cable. USB port connects to your pc, and
serial port to the TV’s RS232 port.
USB connector: to PC.
Serial connector: to TV’s RS232
port.
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For the first connecting, the pc will recognize and automatically install the USB device. The
process is just like the installation of a mini disk, see the following picture.
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6.2 Upgrading with the MtkTool
MTKtool is a green program needing no installation. It is saved in the folder
. There are five folders/files in this folder altergether.
The MtkTool using log is restored in the MtkLog folder. It records the running time and date
whenever the tool is used. The log will be a txt file named by the date and time.
After connecting the TV with your PC, double click
MtkTool.
If following error appears, it means the related port is not be set properly.
Ignore these errors, click “Confirm” and enter the MtkTool main interface, see the
following picture.
Flash chip model
Please refer to follow steps to update the software:
1—Select mode of Flash chip to MT538X as the below picture.
2—Refer to the next page instruction to select the communicate port.
3—Press the icon beside the baud rate and make sure it is green as the below picture.
4—Set the flash baud rate to 115200 as the below picture.
icon, open the
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5—Click the browse button to select the *.bin file that will be updated.
6—Click the “start” button to update software.
Select mode
of Flash chip
Communicate
port
LCD TV Service Manual
Set Flash
Baud Rate
Select *.bin
file
Start upgrade
Information of upgrade
process
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Open “Device Manager” and find which port is connected with the TV. In above picture, COM4
is connected to the TV; so, select “COM4” in the MtkTool main interface. Select the right baud rate
according to chip model. For this unit( chip model is MT538X), select 115200.
Note: Where or not click the “Auto Set Flash Baud Rate” in the “window” menu depends
on the chip type. If the flash chip does not support high speed transport, do not select this option;
otherwise, reserve the selected mood.
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Click “Browse” button, find the upgrading program file, and select it. Press “Upgrade” button
and start upgrading.
The following interface appears on the screen, indicating upgrading successfully.