LL-T17D3 - Sharp Monitor Service Manual (repair manual). Page 15

LL-T17D3-H/B

TROUBLESHOOTING

5 – 1

No power supply

Does LED turns on in green 
when power switch is turned 
on?

No

No

No

No

No

No

LED turns on in red?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

*  Check LED for breakage.
*  Check key cable for disconnection.

Replace any unit (main PWB, SW PWB, cable) 
which shows any defect, with a new one.

1) PC is turned off?
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.).

Synchronizing signal is input to main PWB?

Replace RGB/DVI 
cable with a new one.

LED turns on in orange?

Check power input system.

1) AC adapter
   *  Normal?
   *  Connected properly?
2) Blown out fuse (F1, F02, F03)?
3) Check +5VX, 3.3VX, 3.3VA, VDD, VD
    and VLCD are output?
4) LED
   *  Check LED for breakage.
   *  Check the path between W04 and 

IC15.

   *  Check the cable for disconnection.

Replace any defective unit.
[ 1) AC adapter, 2) Main PWB, 
3) Switch PWB ] with a new one.

Backlight turns ON?

Check for RGB/DVI cable 
input signal.

Replace RGB/DVI cable.

Check each pin terminal 
of W05.

Normal

Normal

Normal

Defective

Defective

*  Check inverter PWB unit.
Note: Use caution when checking output 

side because it has a high voltage. 

Replace LCD module lamp with 
a new one.

Replace inverter PWB 
unit with a new one.

A