3. Protection or without light (refers to the disappearance of image several seconds
after the emergence of image)
4. White panel
Theimagedisappearedimmediatelyafterthe
emergence; check the plug of high-voltage switch board
for striking sparks and poor contact
No problems identified, replace high-voltage
board; if the fault remains, check the contact
line of back light of LCD for any damage, and
replace LCD board.
Ifthereisspark striking,
replace high-voltage board
YES
NO
White panel refers to the back light works
without visible signal and just show white
screen. Check the voltage of socket for flat
cable connecting the main board to screen
for abnormality
Check the interface between main board
and connect line for any looseness,
shedding,ifnoabnormityexisted,
replace LCD screen
Check the power supply chip of
control screen or replace main
board
YES
NO
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5. White screen after power-off (work normally when power on, but when power-off or
no signal input, the screen shows a white screen)
6. TV without channel or with color cast
Check whether there is change of voltage at the high voltage
board controlled by main board when power-on and power-off
Check whether the voltage change of the control pins on
the plug interface of high voltage board is normal when
power-on and power-off
Check whether the voltage of the pin on main chip
controlling the working voltage of high voltage board is
normal when power-on and power-off
YES
NO
Thecircuit
relatedto
highvoltage
board is poor
Checkwhetherthelines
between main board and high
voltage board is in open-loop
or poor contact
Check relevant circuits of
highvoltageboard
controlled by main board
Replace poor main
chipsorrecopy
software
Check TV antenna plug for looseness and
poor contact
If with color cast, check the setting of
color system under menu; and change
of color system to see whether it is
normal (Usually set to automatic)
Replace antenna plug
Check the antenna and its signal
source, if no problems exist, replace
tuner or control chips with the same
model
NO
YES
YES
YES
NO
NO
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7. Poor sound
8.No VGA input signal
Switch to other audio input, check whether DVD
input and PC main board input has sound
Poor sound refers to without sound or with noise; check
whether the selection of sound system is proper
No sound; check whether remote control mute is
selected and switch sound system
No sound for other inputs; check the sound
amplifier and the shared control circuit
There is sound for other inputs,
replace TV tuner or control chip
YES
YES
NO
NO
VGA signal input does not respond, the screen
prompts “Please input signal”, check whether PC
signal source and signal line is normal.
Check VGA signal input board and see whether the row
and field sync signal protection diode is broke down
Replace PC or signal line, check
display VGA plug for looseness
Replace the motherboard or
factory reset is normal
Replace the 5.6V Zener diode
on the motherboard
NO
YES
YES
NO
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9. Poor embedded power supply of TV
10. Common fault of LCD screen
10.1 Bright line or bright belt (BL): constant longitudinal or transverse illuminating line or
belt due to non-conformed connection between IC and glass
10.2 Dark line (DL):constant longitudinal or transverseilluminating line due to
non-conformed connection between IC and glass.
10.3 White panel (WP): only light tube illuminates owing to non-conformed drive plate of
the LCD, without any display signal in the display area, and the whole screen is white.
10.4 Screen breaking: (overflow of LCD): with damage or invisible damage of the liquid
crystal glass, irregular black defect occurs from liquid crystal body to glass and polarizer,
which can not be seen at any image. The overflow portion can not form image and does not
display.
10.5 Pressing Scrape (PS): after local display area at the front of LCD is heavily pressed,
Power on, check embedded power supply 5VSB in TV for 5V voltage output
High electrical level existed at
STB (higher than 2.5V)
Replace power supply
YES
YES
NO
NO
Check EC2 for 380-400V
voltage; if there is not,
replace power supply
Check +5V , +12V
for normal input
YES
Check power supply line for looseness, check indictor for
working and power supply socket for looseness
NO
NO
Replace power
supply
Fastenlines
and socket
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glass of the pressed portion is not damaged, the liquid crystal body can not display normally,
with spot or block black defect.
10.6 Screen mess: irregular color display arising from damage of driving plate in LCD.
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Factory menu entry: Press MENU, and then press 1999
Primary menu Secondary menu Value,remark
MDOE VGA,YPBPR,Selection
R-GAIN
G-GAIN
ADC ADJUST
PICTURE MODE
W/B ADJUST
SSC SETTING
Spectial set 2HOUR OFF 2hours power off enable
VIF Vif 1 Vif set
B-GAIN
R-OFFSET
G-OFFSET
B-OFFSET
AUTO ADC ADC automatically adjust
Input Source Source Selection
MODE Dynamic/Standard/Sotf/User
BRIGHTNESS BRIGHTNESS
CONTRAST CONTRAST
COLOR COLOR
SHARPNESS SHARPNESS
TINT TINT
Copy all No function
inputsource Source Selection
TEMPERATURE Cool, Stan dard, Warm
R-GAIN
G-GAIN
B-GAIN
R-OFFSET
G-OFFSET
B-OFFSET
Copy all No function
MIU Enable DDR spectrum enable
MIU0 Span Exhibition frequently wide
MIU Step Spread spectrum step
LVDS enable LVDS spectrum enable
LVDS Span Exhibition frequently wide
LVDS Step Spread spectrum step
LVDS swing LVDS swing
WDT Watch dog on/off
White pattern Whi te p att er n sel ect ion
Restore user default Factory reset
PVR_RECORDALL PVR Record on/off
Power Power mode selection
Mirror Mirror function selection
Ageing mode Ageing mode enable
Overscan_vposition Adjust overscal V position
other Test pattern
UART DEBUG DEBUG ON/OFF
HDMI CEC/ARC CEC/ARC ON/OFF
Backlight Adjust backlight
CI+ key usb upgrade CI+ key usb upgrade
SW information SW information
MODE Feature Selection
OSD 0
Non-linear
Channel table1 KTC factory Frequecy table set
CI factory setting No function
Channel table2 KTC factory Frequecy table set
Channel dvbt KTC factory Frequecy table set
* Personal computer (WINDOWS XP or WINDOW7 32 bit operating system,USB2.0)
* AC100~240V power supply and power cord
* ISP burning board
* ISP burning board driver
* ISP Tool V4.5.2.8.SZ.exe
* VGA wire
* USBflash disk(2.0 version,Capacity not more than 8G)
* Mainboard software
2、Preparatory work before the upgrade
Recorded the white balance data of VGA/YPBPR signal source in factory menu before upgrading(FLASH initialization
may occur after the upgrade, flush color calibration data, then restore the data you have been recorded):
(1). In the condition of YPbPb message source, press the MENU button after appear the main menu, then
followed by 8202 number keys to enter the factory menu, select ADC ADJUST item, press the OK key to enter
the next level menu, move the cursor to the MODE item, press the left / right Moving button and move the
cursor selection in YPbPr (SD)item, record the R-GAIN/G-GAIN/B-GAIN value and
R-OFFSET/G-OFFSET/B-OFFSET value.
(2). In the ADC ADJUST item, press OK key to enter the next level menu, move the cursor to the MODE item,
press the left / right cursor keys to select YPbPr (HD) item, record R-GAIN/G-GAIN/B-GAIN value and
R-OFFSET/G-OFFSET/B-OFFSET value.
3、Operations and procedure of software upgrading:
(1). Changed the file name to "MERGE.bin", then store software in the FAT32 format blank U disk.
(2). Insert USB flash disk into the USB upgrade port, upgrade the software according to the following the operating
instructions::
Method 1(Method 1 will not erase the original EDID and HDCP KEY on mainboard. Easy operation, you only need
one U disk to upgrade. So we require customer use this way to upgrade.):
① . Start the machine and wait the normal picture display, press the MENU button on the remote control, will be
popping up the main menu, press the 8202 number keys and enter the Factory Setting menu.
②. Press up/down keys to move the cursor to "software update(USB)" function menu, then press right key to select
"YES", to implement USB upgrade command:
a. After prompt "File system init error", means that the machine have found USB device, but did not find the needing
Record the R/G/B-GAIN and R/B/G-OFFSET value under the
YPbPr(SD) and YPbPr(HD) mode, to be replaced the recorded value
after the machine software upgrade
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upgrade software, please check the software name is correct or format the U disk again and then copy software.
b. After prompt "USB Connect Detect fail", means that the machine does not find USB device, check if the USB device
has been inserted into, or change another U disk and try again.
③. Display percentage progress prompts and about 10 seconds later, the machine black screen and restart automatically,
means that the machine complete the upgrade process, turn off the machine first, then pull out the U disk.
Press
OK
key
升级异常
Upgrading
Abnormal
Did not identify
upgrade file
When software upgrading
completed, the machine will
restart automatically, and then
display this menu
Did not identify
Method 2:Keep pressing VOL+ and CH+ keys on the machine panel, power on the machine, the standby light flashes
quickly after about 5 seconds, standby light goes out and turn into lighting after about a minute, means that upgrade is
completed.
Method 2:Keep pressing
VOL+ and CH+ keys on
the machine panel, power
on the machine, the
standby light flashes
quickly after about 5
seconds, standby light
goes out and turn into
lighting after about a
minute, means that
upgrade is completed.
U disk
(3). Notices:①. When the machine Upgrading (U disk light flash), do not remove U disk or switch off the power, otherwise it will
destroy the software and lead can not upgrade.
②. The machine must be power off when inserted or pulled out U disk, to avoid damaging U disk or machine.
③. Because of compatibility between machine and U disk, some machines will not flicker during upgrading. Please
change U disk (The capacity of U disk is not more than 2G) or use method 1 to upgrade.
④. If the display screen can't display menu normally, it cannot use "method 1" to upgrade, you can use Mstar ISP Tools
to upgrade except method 1 and method 2.
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4、When cannot upgrade in accordance with the step two, or upgrade failed, can only ISP upgrade, please refer to the
following instructions.
(1). Connect the ISP burning board and TV VGA port with VGA cable.
(2). Insert the Mstar USB Tool into the USB port of your PC. The PC can recognize the new device. You can choose to
install it in the list, or choose to install at a specified directory and specify the path to the drive file. See the figure below:
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(3) When PC finds the drive file, it will give the prompts as in the figure below during the installation process. Please
click “Continue" to go ahead. The system will go through three drive installation processes, including Mstar USB Debug
Tool A, Mstar USB Debug Tool B, and Mstar USB SerialPort. They will be installed one by one.
C. Program burning
1. When the drives are installed, connect the Mstar USB Tool board to TV in such a way as specified below. Then,
connect the TV power cord and run the software ISP-Tool V4.5.2.8.SZ.exe to burn the program into the TV drive board..
2. In the config menu bar to select Use USB and Auto release USB, Communication Setting items corresponding to the
Port Type menu select USB。Set the burning speed of 48 in I2C Speed Setting item, ISP Slave Address item menu select
OX92,Serial Debug Slave Address menu select 0XB2。
Computer
USB cable
ISP burning
board
VGA cable
TV VGA
socket
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(3). Click Connect button to connect, if it prompts “Device Type is GD25Q32”, means that normal connecting; if it
prompts “Can't find the Device Type!” means that there is poor connecting, please have a check.
Abnormal
(4). Click "Read" button in tool bar, then click "Read" to load current software.
34
OK
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(5). Click "Auto" button in tool bar to set the corresponding settings.
Then click “RUN”button to burn software.
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When display“PASS”, means that it succeed,then burn EDID according to the following instructions.
5、When upgrading complete, it must be adjusted before leave factory:
(1). Power to the machine, press MENU button on the remote control then press 8202 number keys and then will popping the factory menu
automatically, press the remote control up/down cursor keys to move to the "Reset" option press OK key to implement. After about 5 seconds
latter the machine implement clear command automatically. After about 5 seconds latter the screen will be black and it flashes blue lantern
panel display, it said that the order implement successfully.
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Panel standby light bright, resetting
Press OK key on remote
control to implement
factory reset
(2). Insert signal cable to the machine, switch to the PC message source.
(3). Run the KTC-LCD test software, switch to the mosaic picture and best resolution. Press MENU key to popup the
main menu, and then press 8202 number keys to enter the factory menu, press the shift douwn key to ADC ADJUST
option to press OK key to enter the next level menu. In the MODE option press left/right cursor keys to select RGB, and
then press shift douwn key to move the cursor to the Auto ADC option, press OK key to enter the next level menu, press
the left/right button to implement ADC action (The screen will flash and Auto ADC function menu prompt SUCCESS
means that debug success, prompt FAIL said that debug failed, try again), press the MENU button to exit factory menu
when debugging completed.
Press OK key on remote
control to implement
factory reset
Press OK key on remote
control to implement
factory reset
(4).Under the YPbPb message source, press the MENU button after popping the main menu, then press 8202 number
keys to enter the factory menu, select ADC ADJUST item, press the OK key to enter the next level menu, move the cursor
to the MODE item, press the left/right Moving key mover cursor to select YPbPr(SD)item, change the
R-GAIN/G-GAIN/B-GAIN value and R-OFFSET/G-OFFSET/B-OFFSET value of the machine after the upgrade to the
value before the upgrade.
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Change the
R-GAIN/G-GAIN/B-GAIN value and
R-OFFSET/G-OFFSET/B-OFFSET
value to the value before the upgrade
under the YPbPr(SD/HD) mode
(5).In the ADC ADJUST item, press OK key to enter the next level menu, move the cursor to the MODE item, press the
left/right keys tomove cursor select the YPbPr(HD)item, change the R-GAIN/G-GAIN/B-GAIN value and
R-OFFSET/G-OFFSET/B-OFFSET value of the machine after the upgrade to the value before the upgrade.
Change the
R-GAIN/G-GAIN/B-GAIN value and
R-OFFSET/G-OFFSET/B-OFFSET
value to the value before the upgrade
under the YPbPr(SD/HD) mode
6、Complete the ADC ADJUST debugging, press MENU key succession to exit the factory built-in menu to save the
adjusted data, and then restore the original packaging.