BBK LT4221HDU Schematic
Liquid Crystal Display Television
Service Manual
Chassis: MST6E89CL
ProductType: LCD42W57P/58P/58PB/60PB
Ver 1.0
Hisense Electric Co.，Ltd.
July, 2008
LCD TV Service Manual
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.................................................................................................................................- 11 -
3. LCD Panel Spec.............................................................................................................................. .. ... ....- 12 -
3.1 General Description.......................................................................................................................- 12 -
3.2 General Features............................................................................................................................- 12 -
4. Chassis Layout and Overall Wiring Diagrams ........................................................................................- 13 -
4.1 Chassis Layout................................................................................................................. .. ... ......... - 13 -
4.2 Wires and Cables Overall Wiring Diagrams .................................................................................- 14 -
5. Factory/Service OSD Menu and Adjustment........................ .. ............................... ..................................- 15 -
5.1 To enter the Factory OSD Menu....................................................................................................- 15 -
5.2 Factory OSD Menu........................................................................................................................- 15 -
6. Software Upgrading........................................................................................................... ......................- 19 -
6.1 Get ready for upgrading..................................................................................................... ............- 19 -
6.2 Upgrading with the ISP_TOOL4.0.9.............................................................................................- 28 -
7. Troubleshooting......................................................................................................................... .. ... ......... - 3 3 -
7.1 Troubleshooting for Remote Control.............................................................................................- 33 -
7.2 Troubleshooting for Function Key......................... .............................. .. ... .............................. ....... - 3 4 -
7.3 TV won’t Power On.......................................................................................................................- 35 -
7.4 Troubleshooting for Audio.............................................................................................................- 36 -
7.5 Troubleshooting for TV/VGA/HDMI input................................. ... .. ... .............................. ............- 37 -
7.6 Troubleshooting for YPbPr input............................................................................................... .. ..- 38 -
7.7 Troubleshooting for Video/S-Video/ SCART input............................... ... .............................. .......- 3 9 -
8. Explode View.................................................................................................................................. .. ... ....- 40 -
9. Schematic circuit diagram .......................................................................................................................- 40 -
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LCD TV Service Manual
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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LCD TV Service Manual
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 WA RNING
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
LCD TV Service Manual
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
LCD TV Service Manual
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
LCD TV Service Manual
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
LCD TV Service Manual
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
LCD TV Service Manual
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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LCD TV Service Manual
2. Product Function Specifications
2.1 Product Function
Note: The above figures are reference only, please refer to the actual units to determine the
appearances.
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2.2 Specifications
LCD TV Service Manual
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LCD TV Service Manual
3. LCD Panel Spec
3.1 General Description
V420H1- L11 is a 42” TFT Liquid Crystal Display module with16-CCFL
Backlight unit and 2-CH LVDS interface。
This module supports 1920 x 1080 HDTV format and can display 16.2M colors
(8-bits+FRC colors).The inverter module for backlight is built in。
3.2 General Features
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(2)
(4)
LCD TV Service Manual
4. Chassis Layout and Overall Wiring Diagrams
4.1 Chassis Layout
(1)
(3)
(1)
(2)
(3)
(4)
No
Description
Main board
Power board
Keypad
IR&Led board
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LCD TV Service Manual
4.2 Wires and Cables Overall Wiring Diagrams
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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.
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
b. With user’s RC
1. Power TV On
2. Press Menu button and call up User OSD Menu
3. Select Sound-> Balance
4. When Balance value is “0”,Enter 0->5->3 ->2 in sequence.
Note: If necessary, re-do number keys.
5. Factory OSD appears.
6. Press the standby button then AC turn off and restart the TV, which can exit factory OSD
menu.
5.2 Factory OSD Menu
The Factory OSD Menu comprises Factory Menu and Design Menu .
5.2.1、Factory Menu
Factory Menu
White Balance
Auto Test
Auto Calibration
LOGO
OSD Language
Country
Option
Factory Init
Test Pattern
Version:
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White Balance
R DRV 8
G DRV 10
B DRV 10
R CUT 136
G CUT 130
B CUT 121
BRIGHT_H 80
CONTRAST _H 80
BRIGHT_L 40
CONTRAST_L 40
LCD TV Service Manual
Auto Calibration
Auto Color
Color Temp. Standard
RED COLOR 136
GREEN COLOR 130
BLUE COLOR 121
Option
SOURCE TV
BRIGHT 0 10
BRIGHT 50 100
BRIGHT 100 150
CONTRAST 0 60
CONTRAST 50 100
CONTRAST 100 150
TOFAC M
HDMI Cable Standard
DQS PHASE 3
LOGO
NULL
HISENSE
WELCOME
EGYPT OFF
Factory Init
QingDao
HuangDao
Guiyang
shunde
Hungary
France
Australia
CLEAR PROTECTLY
CLEAR UNPROTECTLY
Turkey
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