Read Sharp XG-MB67X (serv.man3) Service Manual online
XG-MB67X
8 – 2
Main PWB check
Is 6 V applied to TL1702 and 13 V to
TL1703?
TL1703?
NO
Go to "Power supply ballast PWB check".
YES
Is approx. 6 V applied to TL1742?
NO
Check IC1742 and peripheral circuits.
YES
Is 1.5 V applied to TL1741?
NO
Check IC1741 and peripheral circuits.
YES
Is 3.3 V applied to TL1762?
NO
Check IC1763 and peripheral circuits.
YES
Is 2.5 V applied to TL1763?
NO
Check IC1762 and peripheral circuits.
YES
Is 5 V applied to TL1791?
NO
Check IC1791 and peripheral circuits.
YES
Is 3.3 V applied to TL1792?
NO
Check IC1792 and peripheral circuits.
YES
Is 12 V applied to TL1761?
NO
Check IC1761 and peripheral circuits.
YES
Is3.3 V applied to pin(1) of IC1743?
NO
Check IC1743 and peripheral circuits.
YES
Is 3.18V applied to pin(1) of IC2001? NO
Check IC2001 and peripheral circuits.
YES
Is 3.3 V applied to pin(3) of S2001?
NO
Check that it is set to the N side. Or remove
S2001.
S2001.
YES
Is rectangular wave of 50 MHz sent
to X2251 pin(3)?
to X2251 pin(3)?
NO
Check X2251 and peripheral circuits.
YRS
Check IC2002, IC2262, IC2263 and
peripheral circuits.
peripheral circuits.
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