XG-C455W (serv.man5). Troubleshooting Table - Sharp Projector Service Manual (repair manual). Page 5

XG-C455W/PG-C355W

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Send component signal or RGB signal of 1080i (or 720P) from 
COMPUTER/COMPONENT Terminal.
Select COMPUTER1 or COMPUTER2 using keys on the main 
unit or the remote control.

YES

Is image displayed normally?

YES

End

                                          

NO

Are picture signals sent to TL2502, TL2507, and TL2508?

NO

Check IC2403 and the peripheral circuits.

YES

Is 3.3V applied to TL1723 and TL1734?

NO

Check IC1703, IC1713 and peripheral circuits.

YES

Is 2.5V applied to TL1733?

NO

Check IC1711 and peripheral circuits.

YES

Check IC2505 and peripheral circuits.

                                               
Send the DVI digital signal to the DVI Terminal.
Select “DVI-D Computer” using the keys on the main unit or the 
remote controller.

                                                
Does an image appear properly?

YES

End

 NO

Is the DVI signal supplied to R2549, R2550, R2552, R2553, 
R2555, R2556, R2557 and R2558?

NO

Check DVI Terminal, L2801, L2802, L2803, L2804, D2801, 
D2802 and peripheral circuits.

YES

Is 3.3V applied to TL1723 and TL1734?

NO

Check IC1703, IC1713 and peripheral circuits.

YES

Is 2.5V applied to TL1733?

NO

Check IC1711 and peripheral circuits.

YES

Check IC2505 and peripheral circuits.