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PC-UM10M
CHAPTER 4. TROUBLESHOOTING
No power supply
Does LED turns on in green
when power switch is turned
on?
Backlight turns ON?
Yes
Check for RGB cable input
signal.
Normal
Defective
Replace RGB cable.
A
* Check inverter PWB unit.
Note: Use caution when checking output
Replace LCD module with a
new one.
No
No
LED turns on in orange?
Check each pin terminal
of connector (W05)
Normal
side because it has a high voltage.
Defective
Normal
Replace inverter PWB
unit with a new one.
LL-T15V1
Yes
LED turns on in red?
No
Yes
No
TROUBLESHOOTING
4 – 1
* Check LED for breakage.
* Check key cable for disconnection.
Yes
Replace any unit (main PWB, SW PWB, cable)
which shows any defect, with a new one.
Check whether the unit is in power save
mode (synchronizing signal is not input.).
1) PC is turned off?
2) RGB cable is disconnected?
3) Synchronizing signal is output from RGB
cable?
No
Synchronizing signal is input to main PWB?
Yes
Replace RGB cable
with a new one.
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).
Yes
Replace any defective unit.
[ 1) Adapter, 2) A Main PWB, 3) Switch
PWB ] with a new one.
No
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