XG-MB67X
8 – 3
DMD system check
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
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