Read Sharp LL-T1815 (serv.man14) Service Manual online
PC-UM10M
LL-T1815-H/B TROUBLE SHOOTING
4 – 1
CHAPTER 4. TROUBLE SHOOTING
First of all, check that all the following accessory cables are properly connected.
Also check that the video mode setup of your PC is set to the signal timing conforming to this machine.
Accessory cables
• Exclusive-use AC adapter
• Exclusive-use analog signal cables (RGB cable, DVI-A cable)
• Exclusive-use digital signal cable (DVI-D cable)
THE DISPLAY DOES NOT WORK. (ANALOG RGB)
When the power button is pressed, does the LED
light up?
3
(No)
Execute
1
.
4
(Yes)
When the RGB cable is disconnected, does the
LED turn from Green to Orange?
3
(No)
Execute
1
.
4
(Yes)
When the RGB cable is connected again, does the
LED keep Green?
(Without changing from Green to Orange)
3
(No)
Execute
2
.
4
(Yes)
Does the B/L light up? (
∗
Light leaks from clear-
ance of lead wires on the sheet metal side. )
3
(No)
Execute
3
.
4
(Yes)
Does the display work properly in each video
mode?
3
(No)
Execute
4
.
4
(Yes)
There is no abnormality.
1
4
Is 5V (Main PWB LD69) outputted?
3
(No)
Check IC28 and its peripheral circuits.
4
(Yes)
Is 5V (Main PWB LD69) outputted?
3
(No)
Execute
2
.
4
(Yes)
Do Q8 (1 pin) and R196 supply an output? (4.5V)
3
(No)
Execute
2
.
4
(Yes)
Does FB9
•
CN5 (2 pin) supply on output? (2.0V)
3
(No)
Check Q8 and its peripheral circuits.
4
(Yes)
Do Q7 (1 pin) and R185 supply an output? (4.5V)
3
(No)
Execute
2
.
4
(Yes)
Does FB9
•
CN5 (2 pin) supply on output? (2.0V)
3
(No)
Check Q7 and its peripheral circuits.
4
(Yes)
Check connection of the SW cable and the SW
PWB.
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