Sanyo LMU-TK18AG2, Service Manual

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2. TROUBLESHOOTING
Check the following for troubles of LCD monitor.
No. Check Points Treatments Class
1
1 Is the Power "ON" to a LCD Monitor ?
Check AC outlet, AC cord, DC Jack and
Power switch for a LCD monitor
A
2 Is the Power "ON" to a Computer ? Check the Power for a Computer A
3 Is a signal cable connected securely ? Check the connection of a signal cable A
4 Is a computer standing by ?
Be out of standing by condition, by operating
to a computer
A
5
Disconnected a signal cable ? or Bent a
terminal pin ?
Ensure the connection of a signal cable B
6 Is an AC Adapter defective? Replace an AC Adapter with the new one C
7
Is the wire harness between main PCB and
LCD module secured firmly ?
Check the connection of wire harness C
8
Is the wire harness between LCD module and
DC/DC Comnv. secured firmly ?
Check the connection of wire harness C
9
Is the wire harness between DC IN PCB and
DC/DC Conv. PCB secured firmly ?
Check the connection of wire harness C
10
Is the wire harness between main PCB and DC
IN PCB secured firmly ?
Check the connection of wire harness C
11 Is the LCD module defective ? Replace a LCD module with the new one C
12 Is the Inverter block on LCD module defective ? Replace a LCD module with the new one C
13 Is the DC/DC Conv. PCB defective ?
Replace a DC/DC Conv. PCB with the new
one
C
14 Is the display circuit on main PCB defective ? Replace the main PCB with the new one C
15
Is the Power Supply circuit on main PCB
defective ?
Replace the main PCB with the new one C
2
1 Is a screen saver programming running ?
Press any key or touch the mouse, to end the
screen saver program
A
2
Is the computer's signal timing not agreeable to
the LCD's specification ? Adjust the computer's signal timing, if
possible
B
3
Is the Image Processing circuit on main PCB
defective ?
Replace the main PCB with the new one C
3
1
Is the wire harness between main PCB and
LCD module secured firmly ?
Ensure the connection of wire harness C
2 Is the LCD module defective ? Replace a LCD module with the new one C
3
Is the Image Processing block circuit on main
PCB defective ?
Replace the main PCB with the new one C
A It is possible to treated by end-user
B It might be possible to treat by end-user in some case.
C It must be treated by Professional Technical Staff
Symptom
No Picture with Back light OFF
No Picture with Back light ON
White/Grey on whole screen(Nothing on screen)
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