Hisense MTK8222 User Manual
LCD Television
Service Manual
Chassis： MTK8222
Ver 1.0
Hisense Electric Co.，Ltd.
August，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. Factory/Service OSD Menu and Adjustment..................................................................................................- 10 -
2.1 T o enter the Factory OSD Menu...........................................................................................................- 10 -
2.2 Factory OSD Menu...............................................................................................................................- 10 -
3 Software Upgrading........................................................................................................................................- 14 -
3.1 Get ready for upgrading........................................................................................................................- 14 -
3.2 Upgrading with the MtkTool................................................................................................................- 16 -
3.3 Update with USB directly.....................................................................................................................- 20 -
4. Troubleshooting..............................................................................................................................................- 22 -
4.1 Troubleshooting for Remote Control....................................................................................................- 22 -
4.2 Troubleshooting for Function Key........................................................................................................- 23 -
4.3 TV won’t Power On..............................................................................................................................- 24 -
4.4 Troubleshooting for Audio....................................................................................................................- 25 -
4.5 Troubleshooting for TV/VGA/HDMI input..........................................................................................- 26 -
4.6 Troubleshooting for YPbPr input..........................................................................................................- 27 -
4.7 Troubleshooting for Video/S-Video input.............................................................................................- 28 -
5. Explode View..................................................................................................................................................- 29 -
6. Schematic circuit diagram..............................................................................................................................- 29 -
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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 not undertaken any
such broad evaluation. Accordingly, a serviceman that uses a service procedure or tools,
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LCD TV Service Manual
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.
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, make sure
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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 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.
LCD TV Service Manual
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
LCD TV Service Manual
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.
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
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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.
LCD TV Service Manual
• 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.
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. Factory/Service OSD Menu and Adjustment
2.1 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.
2.2 Factory OSD Menu
2.2.1 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:
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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.
2.2.2 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
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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.
2.3 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
LCD TV Service Manual
Saturation Max Max Saturation
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
Think about the
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Audio Mode
Backlight co
EMI 0
Power Mode Last station
The above “Factory/Service OSD Menu” are reference only, please refer to the actual units to
determine the appearances.
LCD TV Service Manual
Audio out power
before adjusting
When value is 25
Volume 25
Volume Mid
Volume 75
Volume Max
Audio Mode
120HZ
500HZ
1.5kHZ
5kHZ
10kHZ
PVM 0-350
PVM 350-500
PVM500-1000
PVM 1000-10000
PVM 10000-
Think about the
Audio out power
before adjusting
When value is 50
Think about the
Audio out power
before adjusting
When value is 75
Think about the
Audio out power
before adjusting
When value is 100
Think about the
Audio out power
before adjusting
Standard 、 user 、
Music 、 Speech,
Music
Different frequencies
for different Audio
Mode
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