Sharp XG-MB50X Service Manual page 32

XG-MB50X
XR-11XC
XR-10X/S
XR-20X/S
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
NO
Is the screen all black?
Is 3.27 V applied to IC2231
pin(1) and 1.8 V to TL2231?
Is 400 MHz on IC2241 pin
(20)?
Is approx. 7 V applied to
TL9303?
Is approx. 26 V applied to
TL9301?
Is approx. -26 V applied to
TL9302?
YES
NO
YES
NO
Check IC2231, IC2201,
and their peripheral
circuits.
YES
NO
Check IC2241 and
peripheral circuits.
YES
NO
YES
NO
Check IC9301 and
peripheral circuits.
YES
NO
YES
32
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.