Read Sharp LL-T15G4 Service Manual online
LL-T15G4-H/LL-T15G4-B
TROUBLESHOOTING
4 – 1
CHAPTER 4. TROUBLESHOOTING
Replace power supply unit.
Check LED for breakage.
Check key cable for disconnection.
Check key cable for disconnection.
No power supply
Does LED turns on in green
when power switch is turned
on?
when power switch is turned
on?
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1) PC is turned off?
2) RGB/DVI cable is disconnected?
3) Synchronizing signal is output from
2) RGB/DVI cable is disconnected?
3) Synchronizing signal is output from
RGB/DVI cable?
Check whether the unit is in power save
mode (synchronizing signal is not input.).
mode (synchronizing signal is not input.).
Synchronizing signal is input to main PWB?
Replace
RGB/DVI cable with a new one.
RGB/DVI cable with a new one.
LED turns on in orange?
LED turns on in red?
No
No output +5V, 12V from
power supply unit.
power supply unit.
Check power input system.
1) Power suply PWB
* Normal?
* Connected properly?
2) Blown out fuse (F1) on main PWB?
3) Check +5VX, 3.3VX, VCC3.3, VCC2.5
* Normal?
* Connected properly?
2) Blown out fuse (F1) on main PWB?
3) Check +5VX, 3.3VX, VCC3.3, VCC2.5
and VLCD are output?
4) LED
Check LED for breakage.
Check the path between P2 and V3.
Check the cable for disconnection.
Check LED for breakage.
Check the path between P2 and V3.
Check the cable for disconnection.
Replace any defective unit.
[ 1) Power suply PWB, 2) A Main PWB,
3) Switch PWB] with a new one.
[ 1) Power suply PWB, 2) A Main PWB,
3) Switch PWB] with a new one.
Backlight turns ON?
Check for RGB/DVI cable
input signal.
input signal.
Replace
RGB/DVI cable.
RGB/DVI cable.
Check each pin terminal
of Connector (P12).
of Connector (P12).
Normal
Normal
Normal
Defective
Defective
Defective
Check output circuit
to Connector (P12).
1) If +12V is NG, replace
to Connector (P12).
1) If +12V is NG, replace
* Check inverter PWB unit.
Note: Use caution when checking output
Note: Use caution when checking output
side because it has a high voltage.
(1400 Vrms when starting)
(1400 Vrms when starting)
Replace LCD module lamp with
a new one.
a new one.
Replace inverter PWB
unit with a new one.
unit with a new one.
A
No
Replace RGB/DVI cable with a new one.
*
*
*
*
*
Click on the first or last page to see other LL-T15G4 service manuals if exist.