Chapter 4. Troubleshooting - Sharp LL-T15G1 Service Manual

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
LED turns on in red?
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-T15G1/E15G1 TROUBLESHOOTING
Yes
* Check LED for breakage.
* Check key 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)?
3) +5VX, 3.3V, PVD, VDD, VD, 3V3, VLCD,
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?
3V3 signal is output?
* Check LED for breakage.
* Check the path between J101 (Pin 3)
and IC101 (Pin 16).
Yes