Sharp PG-F320W Service Manual page 31

DMD system check
Check P2501 for breakage and solder crack and peripheral resis-
tance for solder crack.
Check SC9101 on the DMD PWB for breakage and solder crack.
Is there any vertical stripe (block noise) on the Screen?
Is the screen all black?
Is 12.5 V applied to IC3803 pin (2) and 1.8 V to
TL3809?
Is 400 MHz on IC2201 pin (26) and pin (27)?
Is 320 MHz on IC2204 pin (13) and pin (14)?
NO
Is approx. 8 V applied to TL9303 on the DMD PWB?
Is approx. 26 V applied to TL9301 on the DMD PWB?
Is approx. -26 V applied to TL9302 on the DMD PWB?
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
YES
YES
YES
YES
YES
YES
YES
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 Check IC3803, IC2205, and their peripheral circuits.
NO Check IC2201 and peripheral circuits.
NO Check IC2204 and peripheral circuits.
NO
NO Check IC9301 and peripheral circuits.
NO
5 – 3
PG-F320W