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LL-T1512W
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
Replace LCD module lamp with
a new one.
No
No
LED turns on in orange?
Check each signal of
BL_ON,+12V,BRI(150Hz,
Duty 15~65%)
Normal
* Check inverter block of main PWB.
Note: Use caution when checking output
side because it has a high voltage.
Defective
Normal
Replace main PWB
unit with a new one.
Yes
LED turns on in red?
* Check LED for breakage.
* Check cable for disconnection.
No
Replace any unit (main PWB, SW PWB, cable)
which shows any defect, with a new one.
Yes
Check whether the unit is in power save
mode (synchronizing signal is not input.).
1) PC is turned off?
No
2) RGB cable is disconnected?
3) Synchronizing signal is output from RGB
Synchronizing signal is input to main PWB?
Check power input system.
1) AC adapter
2) Blown out fuse (F1, F2) ?
3) Each signal of 5V, D3, 3V, PVDD,
4) LED
Replace any defective unit.
[ 1) Adapter, 2) A Main PWB, 3) Switch
PWB, ] with a new one.
4 – 1
Yes
cable?
No
No
Yes
Replace RGB cable
with a new one.
* Normal?
* Connected properly?
AVDD1.8V is output ?
* Check LED for breakage.
* Check the path between CN10 and
IC22.
* Check the cable for disconnection.
Yes
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