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CHAPTER 4. TROUBLESHOOTING
No power supply
Does LED turns on in green when power switch is turned on? Yes
No
No output +5V, 12V from power supply unit.
Yes
Replace power supply unit.
LED turns on in red? No
Yes
* 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.
No Backlight turns ON? Yes LED turns on in orange? No Yes
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?
Check for RGB cable input signal. Normal Defective
Check each pin terminal of P3. Normal
No
Synchronizing signal is input to main PWB? Yes No Replace RGB cable with a new one.
A
Replace RGB cable.
* Check inverter PWB unit. Note: Use caution when checking output side because it has a high voltage. Normal Defective
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 inverter PWB unit with a new one.
Replace LCD module lamp with a new one.
Replace any defective unit. [ 1) Power supply PWB, 2) Main PWB, 3) Switch PWB ] with a new one.
LL-T15S3
TROUBLESHOOTING
4�1
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