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CHAPTER 4. TROUBLESHOOTING
No power supply
Does LED turns on in green
when power switch is turned
on?
Yes
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 lamp with
a new one.
No
No output +5V, 12V from
LED turns on in red?
No
LED turns on in orange?
Check each pin terminal
of P3.
Normal
side because it has a high voltage.
Defective
Normal
Replace inverter PWB
unit with a new one.
LL-T15S3 TROUBLESHOOTING
Yes
power supply unit.
Yes
No
Yes
No
4 – 1
Replace power supply unit.
* 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) Power supply PWB
* Normal?
* Connected properly?
2) Blown out fuse (F1)?
3) Check +5VX, 3.3VX, 3.3VA, VDD, VD
and VLCD are output?
4) LED
* Check LED for breakage.
* Check the path between P5 and U6.
* Check the cable for disconnection.
Yes
Replace any defective unit.
[ 1) Power supply PWB, 2) Main PWB,
3) Switch PWB ] with a new one.
No
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