PC-UM10M
LL-T15V1
TROUBLESHOOTING
4 – 1
CHAPTER 4. 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
Yes
* Check LED for breakage.
* Check key cable for disconnection.
Replace any unit (main PWB, SW PWB, cable)
which shows any defect, with a new one.
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)?
3) +5VX, 3.3V, PVD, VDD, VD, 3V3, VLCD,
3V3 signal is output?
4) LED
* Check LED for breakage.
* Check the path between J101 (Pin 3)
and IC101 (Pin 16).
Replace any defective unit.
[ 1) Adapter, 2) A Main PWB, 3) Switch
PWB ] with a new one.
Backlight turns ON?
Check for RGB cable input
signal.
Replace RGB cable.
Check each pin terminal
of connector (W05)
Normal
Normal
Normal
Defective
Defective
* Check inverter PWB unit.
Note: Use caution when checking output
side because it has a high voltage.
Replace LCD module with a
new one.
Replace inverter PWB
unit with a new one.
A
