How to Repair ITM
Content
1 Component
2 repair instruction
3 How to define problem
4 How to repair
5 How to disassemble
6 PC part
7 Button and Ports
1.1\Component
LED driver
board
Power board
60HZLEDscreen
PC power on button and
touch pinboard
PC
touch screen
external connection
pinboard
182VG2.0 mother
board
1.2\ 6M48V2.0 Port
Power port
Back light port
LVDS port
Button port
Remote
control port
USB
HDMI1
HDMI2
VGA
Audio
input
Audio port
1.3\182VG2.0 Port
Power port
Button port
Back light
control
LVDS port
Audio output
Remote
control port
USB
HDMI x 3
VGA
音频输入
2 repair instruction
Precaution
• Make sure panel is shut down and power is cut.
• Non-professional can not do repair
• This manual is suit to panel model (black)
Tools
• Screwdriver
• Multimeter
• PC/laptop
• tweezers
2 repair instruction
Part can be replaced
TV
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TV power board
TV mother board
Speakers
LVDS cable
Cables
Button board
Remote control receiver board
Touch screen pinboard
LED driver board
Touch screen
PC
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Memory card
Hard disk
Mother board
CPU
Fan
PC power
Cables
Touch/button pinboard
3/How to define problem
 Problem1：panel can not power on
1) Check if power indicator is RED after power connects and power button
is on.
2) When indicator is RED, use remote control to power on panel, if can
power on, the power on/off button is fault. If remote control can not power
on panel, to update TV mother board software. If update fail, to replace
TV mother board.
3) When power indicator is not light
 take off back cover of panel
 Check electric of power switch button and power board, use multimeter to
test if power output is good under 5V/12V/24V.
 If there is no power, replace power board and check if panel works
4) When power indicator is not light and there is power from power board.
 to check the connection between power board and TV mother board
 to check TV mother board power port, if there is power
 If there is power from TV mother board power port, to replace TV mother
board
3/How to define problem
Connect power and check
power indicator is light
Replace power
switch or power
board
Indicator is RED or Blue,
but screen can not light
on
Check connections
between power board
and TV mother board
Replace TV mother
board
Update TV mother board
by software
Power on?
Power on?
Test
End
Contact with supplier
3/How to define problem
 Problem2: Screen Blurred
1)
2)
3)
4)
5)
Adjust TV software specs in factory mode (10 BIT or TIB)
If fail, to update TV mother board software
If not work, disassemble panel and check LVDS cable connection.
If LVDS cable connects good, to replace TV mother board
If screen still blurred after above steps, check if the screen is 120HZ.
If so, replace pinboard of 120HZ screen or update software.
3/How to define problem
Adjust software
specs
Update TV mother
board software
Replace TV
mother board
Display ok
Check LVDS
connection or replace
test
replace pin board of
120HZ screen or
update software
end
Display ok
Contact supplier
3/How to define problem
 Problem3: No signal
1)
2)
3)
4)
5)
Check PC power indicator is YELLOW
If so, check resource setting is correct
If still no signal, check cable between PC and TV
Connect with external PC, if there is signal, PC has problem
When PC connects with TV by HDMI, replace it by VGA (to judge if port is
wrong or connection not good)
6) If still no signal, take out the PC box and check memory card loose or
dusty.
7) Replace memory card and check, if fail, replace PC mother board.
3/How to define problem
PC power indicator
is YELLOW
Check power
connection
Check PC if fan
works
Set signal resource
Connect with
other PC, no
signal
Replace memory
card or clean it
test
end
Replace TV
mother board
signal port
Replace PC
mother board
Signal ok
Replace CPU
Check PC button
and flat cable
Replace PC power
Signal ok
3/How to define problem
Problem 4: screen can not display
1) When power on, after LOGO shows screen can not display
 TV program damages, to update TV board. If not work, replace TV
board
 If still not display, take off panel cover and check back light cable
connection
2) Screen can not display when power on
 check power indicator is light
 If power indicator do not light, it is problem 1
3/How to define problem
Screen can not
display
Check
connection of
back light cable
Update TV
software
Replace TV
board
Display is ok
test
Organize back
light cable and
LVDS
Display is ok
end
Contact supplier
3/How to define problem
 Problem 5：NO sound
1) Check if there is audio output from PC
2) If there is audio output from PC, check connection between PC and TV
3) If connection good, take off back cover of panel, test speaker by
multimeter and check connections. Replace speaker when it is faulty.
4) If still on sound after above steps. To replace TV mother board or
replace amplifier IC(TDA7491LP) on TV mother board.
3/How to define problem
Check audio
output from PC
Check sound
driver
Check sound
setting
Check
connections
Check speakers
Replace PC
mother board
Replace TV
mother board
Replace
speakers
Check sound
test
end
Check audio
output
4/Touch part repair
1. Touch part structure
flat cable
These PCB marked different number, there are
different numbers on different size panel
Black PCB is receiver, white PCB is sender.
MCU is sender No.1. the position must be
correct when repair
Flat cable
Flat cable
PCB with USB cable
4/Touch part repair
2. How to define problem
 Problem 1: can not touch
1) Connect panel with external PC, test by Checktool
If Checktool can not work, take off back cover and check USB port
connection. If connection is good, take off touch screen and check touch
port. Firstly, to see USB touch cable welding is good or not.
2) When welding is good, replace a good MCU and test.
3) If still not work after MCU replaced, to check PCB one by one.
4/Touch part repair
Connect panel with
external PC
Check connection
between Pinboard
and PC
Check flat cable, USB
cable welding is good
Replace cable or
pinboard
Replace MCU
Check PCB one by
one
Touch is good
Replace faulty PCB
end
Contact supplier
Replace USB port on
PC board
Touch is good
4/Touch part repair
 Problem 2: Touch is not smooth
1) Connect panel with external PC, check infrared part by Checktool. ( see
picture next page)
2) For example, if tube 1-14 on No.2 PCB is faulty in picture next page
 Find No.2 PCB from receiver or sender by multimeter, and then replace.
 Or directly replace No. 2 PCB from receiver or sender, and check AD by
checktool.
4/Touch part repair
Fault is
No.2 PCB
Infrared tube
number
AD is 0,
wrong
number, so
it is red
Wrong AD
4/Touch part repair
Checktool interface in English
5/How to disassemble
 Take off all external connection cables and wall mount bracket
 Take off back cover to check board, connections
 If there is problem from touch part

Disconnect USB cable, button flat cable, control flat cable,etc

Take out fix part around four sides, see picture next pages
 Take screen and glass to avoid dust

Replace touch part
5/How to disassemble
The part fix screen and glass
5/How to disassemble
Take out the
screws
Take out all screws around frame and
take off screen and glass , put them
together carefully to safe place
5/How to disassemble
Touch frame
Connect this part with PC,
use Checktool to test and
replace PCB
6/PC part
Hard disk
Touch button
connect board
memory
PC
power
fan
PC mother
board
7/Button and Ports
USB Touch
1.PC power on
Audio
input
Power
switch
4.menu
2.TV power on
3. source
HDMI port
Volume adjust
Channel adjust
TV power light
Power on,
Light is red, light is blue
when press TV button
later
VGA port
PC power light
Light is
yellow when
press PC
button