Read Sharp LL-T19D1 Service Manual online
LL-T19D1
TROUBLE SHOOTING
5 – 1
CHAPTER 5. TROUBLE SHOOTING
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
Yes
Yes
Yes
Yes
Yes
1) PC is turned off?
2) RGB/DVI cable is disconnected?
3) Synchronizing signal is output from RGB
2) RGB/DVI cable is disconnected?
3) Synchronizing signal is output from RGB
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.
cable with a new one.
LED turns on in orange?
Check power input system.
1) AC adapter
* Normal?
* Connected properly?
2) Blown out fuse?
3) Check +5V, 3.3V are output?
4) LED
* Check LED for breakage.
* Check the cable for disconnection.
Replace any defective unit.
[ 1) Power/inverter PWB, 2) Main PWB,
3) Switch PWB ] with a new one.
[ 1) Power/inverter PWB, 2) 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.
Check each pin terminal.
Normal
Normal
Normal
Defective
Defective
* Check power/inverter PWB unit.
Note: Use caution when checking output
Note: Use caution when checking output
side because it has a high voltage.
Replace LCD module lamp with
a new one.
a new one.
Replace power/inverter
PWB unit with a new one.
PWB unit with a new one.
A
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