Hisense lcd42v68pam schematic
LCD Television
Service Manual
Chassis： MTK8222
Product Type： LCD42V68PAM
Ver 1.0
Hisense Electric Co.，Ltd.
July，2009
LCD TV Service Manual
Contents
Contents.......................................................................................................................................................................- 2 -
Service Manual ...........................................................................................................................................................- 3 -
1. Precautions and notices.....................................................................................................................................- 3 -
1.1 Warning...................................................................................................................................................- 4 -
1.2 Notes.......................................................................................................................................................- 7 -
2. LCD Panel Spec................................................................................................................................................- 9 -
3. Chassis Layout and Overall Wiring Diagrams................................................................................................- 11 -
Chassis Layout............................................................................................................................................- 11 -
4. Factory/Service OSD Menu and Adjustment..................................................................................................- 12 -
4.1 T o enter the Factory OSD Menu...........................................................................................................- 12 -
4.2 Factory OSD Menu...............................................................................................................................- 12 -
5 Software Upgrading........................................................................................................................................- 16 -
5.1 Get ready for upgrading........................................................................................................................- 16 -
5.2 Upgrading with the MtkTool................................................................................................................- 18 -
5.3 Update with USB directly.....................................................................................................................- 22 -
6. Troubleshooting..............................................................................................................................................- 24 -
6.1 Troubleshooting for Remote Control....................................................................................................- 24 -
6.2 Troubleshooting for Function Key........................................................................................................- 25 -
6.3 TV won’t Power On..............................................................................................................................- 26 -
6.4 Troubleshooting for Audio....................................................................................................................- 27 -
6.5 Troubleshooting for TV/VGA/HDMI input..........................................................................................- 28 -
6.6 Troubleshooting for YPbPr input..........................................................................................................- 29 -
6.7 Troubleshooting for Video/S-Video input.............................................................................................- 30 -
7. Explode View..................................................................................................................................................- 31 -
8. Schematic circuit diagram..............................................................................................................................- 31 -
Hisense Confidential
- 2 -
LCD TV Service Manual
Service Manual
1. Precautions and notices
BEFORE SERVICING THE LCD TV, READ THE SAFETY PRECAUTIONS IN
THIS MANUAL.
USE ONLY MANUFACTURER SPECIFIED REPLACEMENT PARTS WHEN
SERVICING.
USE OF NON-AUTHORIZED PARTS WILL VOID THE MANUFACTURE'S
WARRANTY
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 and pose risk of personal injury
. It is also important to understand that these CAUTIONS and NOTICES ARE NOT
EXHAUSTIVE. Service should only be performed by an experienced electronics
Hisense Confidential
- 3 -
LCD TV Service Manual
techician trained in the proper Television safety and service methods and procedures
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 non-manufacturer's recommended parts 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.
Servicetech assumes all liability.
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.
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, be sure to
use anti-static table mats and properly use a grounding wrist stra. Keep components and
tools also at this same potential.
Hisense Confidential
- 4 -
IMPORTANT:
Always disconnect the power cord from AC outlet before replacing parts or modules.
1.1.3
To prevent electrical shock, use only a properly grounded 3 prong outlet or extension
cord.
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 and will void the
LCD TV Service Manual
manufacturer's warranty.
1.1.5
Safety regulations require that after a repair the set must be returned in its original
condition. In addition, prior to closing set, check that:
-Note:
>All wire harnesses and flex cables are properly routed and secured with factory tape
and/or mounted cable clamps.
> All cables and connectors are properly insulated and do not have any bare wires/lead
exposed.
Hisense Confidential
- 5 -
1.1.6
(1) Do not supply a voltage higher than that specified to this product. This may
damage the product and may cause a fire.
(2) Do not use this product:
> High humidity areas
> In an area where any water could enter or splash into the unit.
High humidity and water could damage the product and cause fire.
(3) 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
LCD TV Service Manual
or electric shock.
(4) 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.
(5) Do not pull out or insert the power cable from/to an outlet with wet hands. It may
cause electric shock.
(6) Do not damage or modify the power cable. It may cause fire or electric shock.
(7) 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.
(8) 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.
(9) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,
Hisense Confidential
- 6 -
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
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
may trip the main 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
Hisense Confidential
- 7 -
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.
• 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
LCD TV Service Manual
short-circuits due to residual electric charge.
• 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.
Hisense Confidential
- 8 -
LCD TV Service Manual
2. LCD Panel Spec
LCD42V68PAM
Panel Model：V420H1-L15\JK\ROH SN：1058010
2.1 General Description
Hisense Confidential
- 9 -
2.2General Features
LCD TV Service Manual
Hisense Confidential
- 10 -
LCD TV Service Manual
3. Chassis Layout and Overall Wiring Diagrams
Chassis Layout
LCD42V68PAM
No Description Part No. Type/Model PCB/ Model
（1）
（2）
（3）
（4）
Main Board
Power Board
Keypad PCA
IR Board
116295 RSAG2.908.1260-2\ROH RSAG7.820.1337\VER.B\ROH
120070 RSAG2.908.1497-3\ROH RSAG7.820.1637\VER.E\ROH
120173 RSAG2.908.1192-13\ROH RSAG7.820.1185\VER.E\ROH
113354 RSAG2.908.1088\ROH RSAG7.820.1101\VER.B\ROH
Hisense Confidential
- 11 -
LCD TV Service Manual
4. Factory/Service OSD Menu and Adjustment
4.1 To enter the Factory OSD Menu
a.. 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.
b. With user’s RC
7. Power TV On
8. Press Menu button and call up User OSD Menu
9. Select Audio-> Balance
10. Enter 0->5->3 ->2 in sequence.
Note: If necessary, re-do number keys.
11. Factory OSD appears.
12. Press Menu again and leave factory OSD.
4.2 Factory OSD Menu
4.2.1 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. And at others signal sources, the
“auto colour “does not work.
Before adjusting, prepare the signal instruments s u ch 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*768 gray-3color For VGA source
2 ADC HDTV 720P gray-3color For Component Video
Notes:
a、Press “M” button and enter factory mode.
Hisense Confidential
- 12 -
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.
3.2.2 Factory Option
Item 0 Item 1 Note
White Balance R DRV Red Driver adjust
G DRV Green Driver adjust
B DRV Blue Driver adjust
R CUT Red Cut adjust
G CUT Green Cut adjust
B CUT Blue Cut adjust
Note: Before adjusting, please change to desired source. Different source has different WB
values.
Factory RESET Zhong Shi Qingdao Jiangxi Road factory
Huang Dao Huangdao Industrial Park
Gui Yang Gui Yang Industrial Park
Liao Ning Liao Ning Industrial Park
Hungary Hisense Hungary
Australia Hisense Australia
France Hisense France
Clean Protected
Clean All
Auto Color
Color T em p
LCD TV Service Manual
Clean data except
WB data and Auto Color data
Clean all data
For VGA and Component Video
sources, WB values must be
adjusted
Color
And at others signal sources,
the “auto colour “does not
work.
Standard
Picture Mode
R Offset
G Offset
B Offset
Brightness Min Min Brightness
Brightness Mid Mid Brightness
Brightness Max Max Brightness
Contrast Min Min Contrast
Contrast Mid Mid Contrast
Contrast Max Max Contrast s
Saturation Min Min Saturation
Saturation Mid Mid Saturation
Saturation Max Max Saturation
Hisense Confidential
- 13 -
LCD TV Service Manual
Factory Option
MODE “M” is only used for factory production.
SW Version
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.
4.3 Designer Menu
Item 0 Item 1 Item 2 Note
Designer Menu
Audio Set
Picture Mode SOURCE The current program
Brightness Brightness Brightness of VIVID
Brightness Contrast Contrast of VIVID
Brightness Saturation Saturation of VIVID
STD Brightness Brightness of STD
STD Contrast Contrast of STD
STD Saturation Saturation of STD
Soft Brightness Brightness of Movie
Soft Contrast Contrast of Movie
Soft Saturation Saturation of Movie
OSD English
Logo Option Devant
To FAC M
Version： Current Software version
Panel Info： The date of current version
Flash:
source
mode
mode
mode
mode
mode
mode
mode
mode
mode
Volume Min When value is 1
Hisense Confidential
- 14 -
Think about the
Audio out power
Loading...