2, Trouble Shooting - Sanyo LMU-TK12A Service Manual

2. TROUBLE SHOOTING
The "TROUBLESHOOTING for LCD Monitor" is described in below. Please refer to the manual "TROUBLE SHOOTING
for Touch-Screen" in CD-ROM.
No. SYMPTOM
1 No Picture with Power
Indicator OFF
2 No Picture with Power
Indicator in Amber
3 No Picture with Power
Indicator in Green
4 No Picture with Power
Indicator blinking in
Green
It is possible to treated by end-user
It must be treated by Professional Technical Staff
It might be possible to treat by end-user in some case.
CHECK POINTS
1 Is the Power to a LCD monitor "ON"?
2 Is an AC Adapter defective?
3 Is the wire harness between main PCB
and DC-IN PCB secured firmly ?
4 The Power Supply circuit on main PCB
may be defective
1 Is the Power to a computer "ON"?
2 Is a computer standing by ?
3 The Image Processing circuit on main
PCB may be defective
1 Is a screen saver programming
running ?
2 Is a signal cable connected securely ? Check the connection of a signal cable
3 Disconnected a signal cable ? or Bent a
terminal pin ?
4 Is the computer's signal timing not
agreeable to the LCD's specification ?
5 Is the wire harness between Inverter
PCB and a LCD module secured
firmly ?
6 Is the wire harness between main PCB
and Inverter PCB secured firmly ?
7 The Brightness control volume may be
defective
8 The LCD module may be defective
9 The Inverter unit may be defective
10 The display circuit on main PCB may
be defective ?
1 Is a computer standing by ?
2 Is a signal cable connected securely ? Check the connection of a signal cable
3 Disconnected a signal cable ? or Bent a
terminal pin ?
TREATMENTS
Check AC outlet, AC cord, DC Jack and
Power switch for a LCD monitor
Replace an AC Adapter with the new
one
Check the connection
Replace the main PCB with the new one
Check AC outlet, AC cord, DC Jack and
Power switch for a computer
Be out of standing by condition, by
operating to a computer
Replace the main PCB with the new one
Press any key or touch the mouse, to
end the screen saver program
Replace a signal cable with the new one
Adjust the computer's signal timing, if
possible
Check the connection of wire harness
Check the connection of wire harness
Replace the Volume PCB with new one,
and check the screen
Replace a LCD module with the new
one
Replace an Inverter unit with the new
one
Replace the main PCB with the new one
Be out of standing by condition, by
operating to a computer
Replace a signal cable with the new one