XG-MB67X (serv.man3). Troubleshooting Table - Sharp Projector Service Manual (repair manual). Page 3

XG-MB67X

8 – 3

Check P2501 for breakage and 
solder crack and peripheral 
resistance for solder crack.

Check SC9101 for breakage 
and solder crack.

Is there any vertical stripe 
(block noise) on the screen?

YES

The main PWB and DMD PWB are in poor 
contact. Check the contact surface for dirt 
and smear. Check the DMD connector for 
breakage. Reassemble the DMD, optical 
mechanism, and DMD PWB. 

NO

Is the screen all black?

NO

Is approx. 7 V applied to TL9303?

NO

Check IC9301 and peripheral cir-
cuits.

YES

YES

Is approx. 26 V applied to TL9301?

NO

Check IC9301 and peripheral cir-
cuits.

YES

Is approx. -26 V applied to TL9302?

NO

Check IC9301 and peripheral cir-
cuits.

YES

The main PWB and DMD PWB are in poor 
contact. Check the contact surface for dirt 
and smear. Check the DMD connector for 
breakage. Reassemble the DMD, optical 
mechanism, and DMD PWB. 

Is 3.27 V applied to IC2231 
pin(1) and 1.8 V to TL2231?

NO

Check IC2231, IC2201, and their peripheral 
circuits.

YES

Is 400 MHz on IC2241 pin(20)? NO

Check IC2241 and peripheral circuits.

1