Hisense LTDN24K26CEU User manual

LCDTelevision
Service Manual
Chassis：MSD308PX
LTDN24K26CEU、LHD32K26CEU(31)、LTDN46K26CEU
Ver 1.0
Hisense Electric Co.，Ltd.
March，2012

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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 Specifications: ...................................................................................................................................- 10 -
2.1 Specification: ........................................................................................................................................- 10 -
2.2 Main Board:..........................................................................................................................................- 11 -
2.3 Rear Cover............................................................................................................................................- 11 -
3. Factory/Service OSD Menu and Adjustment..................................................................................................- 13 -
3.1 To enter the Factory OSD Menu...........................................................................................................- 13 -
3.2 Factory OSD Menu...............................................................................................................................- 14 -
4. Software Upgrading........................................................................................................................................- 15 -
4.1 Upgrading with the ISP_TOOL............................................................................................................- 15 -
4.2 Upgrading with the USB ......................................................................................................................- 20 -
5. Circuit instruction ...........................................................................................................................................- 21 -
5.1 Power assign and block diagram ..........................................................................................................- 21 -
5.2 Image and signal process ......................................................................................................................- 22 -
5.3 Troubleshooting ....................................................................................................................................- 23 -
6. Schematic circuit diagram ..............................................................................................................................- 30 -
7. Explode View..................................................................................................................................................- 30 -

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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 not undertaken any
such broad evaluation. Accordingly, a serviceman that uses a service procedure or tools,

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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.
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
DANGER 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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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 polariz ed ac plug with an extension c ord,
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 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

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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.
(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:

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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
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

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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 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

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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 Specifications:
2.1 Specification:
LTDN46K26CEU：

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2.2 Main Board:
Take LHD32K26CEU(31)、LTDN46K26CEU main board 4862 for example:
The tuner has changed once from FH1610 to TDTC-G901D
T
Note：
2.3 Rear Cover
Main IC
（MSD308）
LVDS OUT
Y PB PR
L R
VGA
USB
HDMI
Earphon
SCART
Audio
AV 1
Optical

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Model Panel Mode LVDS(Main-Panel)
LTDN24K15CEU M236H3-LA2\V236H1-LE2 HX2-2X20KLB400P-CMO\ROH
LHDN32K15/K16CEU HE315DH-E02(S3)\ROH HX2-2×15KLB400P-HS-1\ROH
LHDN32K15CEU(1) HE315DH-E06\S3\ROH Same to LHDN32K15
LEDN42K16CEU HE420CF-E01\ROH HX2-2X26KLBB500-HS-1
LTDN46K26CEU LTA460HM06\ROH HX2-2X26KLBB500-SAM\ROH
LTDN24K26CEU V236H1-LE4\JK\ROH HX2-2X20KLB400P-CMO\ROH
LHD32K26CEU(31) HE315FH-E56\PW1\ROH FFC-30-351\ROH
LTDN42K26CEU HE420FF-B57(1000)\PW1\ROH \HX2-2X26KLBB500-HS\ROH
3. Factory/Service OSD Menu andAdjustment
3.1 To enter the Factory OSD Menu
a. With factory RC (remote control)

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1. Press “M” button and enter factory mode.(Note1)
2. Press “Menu” button and enter factory OSD menu.
3. Press “C H+”/“CH-” button select the function m enu, press “VOL+”/“VOL-” enter the selected
function menu. Press “VOL+”/“VOL-” button adjust values in the menu.
4. Press “M” button exit factory mode in the factory OSD menu.
When TV outgoing factory, user can not enter factory OSD menu with Factory Remote
Note:
1. In the “Factory Menu”, item “Function”->”TOFAC” ,you can select “M” or “U”, default is “U”.
----M-Means you can enter factory mode with factory RC or user RC.
----U-Means you can enter factory mode only with user’s RC.
2. Mode “M” is only used for factory production.
b. With user’s RC
Power on the TV.
1. Press “Menu” button and call up User OSD Menu.
2. Select “ Sound” -> “Balance” item.
3. Press number key 1->9->6 ->9 in sequence when “Balance” item is focused.
Note: If necessary, re-do number keys.
4. Factory OSD appears.
Note: Press the standby button then AC turn off and restart the TV, which can exit factory OSD menu.
3.2 Factory OSD Menu
The Factory OSD Menu comprises Factory Menu and Design Menu .
3.2.1、Factory Menu
Factory Menu
White Balance
ADC Calibration
Funtion
Lnit
Test Pattern
Version
Clear protectly
Clear unprotectly
Function
TOFAC: MorU
PowerMode Save
Software Update
LOGO: Hisense
OSD language: English
WDT: ON
UART Debug : None
White Balance
R-DRV:
G- DRV:
B- DRV
R-CUT:
G- CUT:
B- CUT:

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3.2.2、Design Menu
Note：
The above “Factory/Service OSD Menu”are reference only, please refer to the actual units
to determine the appearances.
4. Software Upgrading
4.1 Upgrading with the ISP_TOOL
4.1.1 Hardware connecting
You can update the software through a special tool (as following)
Connect the Debug board to the TV use VGA interface or the RS232 (4 pin), the other USB
port to the compute.
Design Menu
Picture Mode
Audio Mode
Picture Curve
Audio Curve
SSC Adjust
Saving Mode
Overscan
Not Stand

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4.1.2 Install the ISP_TOOL4.5.0.4-------only for the first time update.
1、The software is upgraded by a burning tool- ISP_TOOL.exe
2、Find the folder where the ISP_TOOL4.5.0.4 lies in.
There are three folders/files in this folder together.
DLPORTIO.dll and FTD2XX.DLL must be in the same folder
3、Double click the ISP_TOOL4.5.0.4 icon, and then a dialog window will show as below.

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4、Click the” Config “button. And then a dialog window will show as below.
Draw on the front of “Use USB”
Port Type setting is USB
Base Addr setting is 0x38C
ISP Slave Address choose 0x92
Serial Debug Slave Address choose 0xB2，
5、Click the “Connect”button，if appear the following figure, It indicates that the ISP_TOOL has

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connected.(According to the tv set,”Device Type” maybe different.)
If appear the following figure，It indicates that the ISP_TOOL has not connected. Please click
the“DisCon”button and “Connect”button to connect..
6、Click the“Read ”button，Choose the correct update file。
7、After the update file has been chosen successfully。
Click the“Auto”button and choose parameters as following。

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8、Click the “Run” button and wait update end.
If show any error message ，then do “Dis Con” >> “Connect”，and click the “Run” button
again，till show the following dialog window。

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4.2 Upgrading with the USB
Software can update with USB device:
1. Copy the “*.BIN” file such as “MERGE.BIN” to the root directory of a USB disk.
2. Insert the USB disk into the USB slot of the TV SET.
3. Press “Menu” button and call up User OSD Menu,choose "Channel"->”Software
Update(USB)” item. (Note 1)
4. Press “OK”, it will show a confirm message box, Press [◀] button to select “yes” in the
confirm message box, to start automatic update.
5. Then it will update the software automatically,Please don’t power off during the updating
process.
6. After the software is successfully upgraded,TV SET will restart automatically.
Note:
1. In some TV SET, ”Software Update(USB)” item maybe in “OPTION” menu.
2.After updating, you must confirm the software version in the “Factory Menu” and you'd better
do a " UnProtected Clear" in the “Factory Menu”.