CHAPTER 5. TROUBLESHOOTING
No power supply
Does LED turns on in green
when power switch is turned
on?
No
No
No
No
No
No
LED turns on in red?
Yes
Yes
Yes
Yes
Yes
* Check LED for breakage.
* Check the path between JP2 (9pin) and
U11(27pin).
* Check cable for disconnection.
Replace any unit (main PWB, SW PWB, cable
Power jack) which shows any defect, with a new
1) PC is turned off?
2) RGB cable is disconnected?
3) Synchronizing signal is output from RGB
cable?
Check whether the unit is in power save
mode (synchronizing signal is not input.).
Synchronizing signal is input to main PWB?
Replace RGB cable
with a new one.
LED turns on in orange?
Check power input system.
1) AC adapter
* Normal?
* Connected properly?
2) Blown out fuse (F1) or power jack PWB?
3) EEPROM (U11) has +5V (VCC)?
4) LED
* Check LED for breakage.
* Check the path between JP2 (9pin)
and U11 (27pin).
* Check the cable for disconnection.
Replace any defective unit.
[ 1) Adapter, 2) A Main PWB, 3) Switch
PWB, 4) Power jack PWB] with a new one.
Backlight turns ON?
Check for RGB cable input
signal.
Replace RGB cable.
Check each pin terminal
of JP5.
Normal
Normal
Normal
Defective
Defective
Check output circuit to JP5.
1) If +12V is NG, replace main
PWB.
* Check inverter PWB unit.
Note: Use caution when checking output
side because it has a high voltage.
(1400 Vrms when starting)
Replace LCD module lamp with
a new one.
Replace inverter PWB
unit with a new one.
A
