Read Sharp XG-MB67X (serv.man3) Service Manual online
XG-MB67X
8 – 8
Check when the lamp turns
off soon after turning on
off soon after turning on
Have connectors P1703,
P1721, P1722, P1723 and
P1724 come off or are they
loose?
P1721, P1722, P1723 and
P1724 come off or are they
loose?
YES
Securely insert the connec-
tors.
tors.
NO
Is each cooling fan rotating?
NO
Check the cooling fan.
YES
Is approx. 3 V applied to
TL1721?
TL1721?
NO
Check peripheral circuits of
Q1721.
Q1721.
YES
Is 12 V applied to TL1761?
NO
Check IC1761, IC3581 and
peripheral circuits.
peripheral circuits.
Go to "DMD system check".
YES
Is 2.5 V applied to TL1763?
NO
Is 3.3 V applied to TL1762? YES
Check IC1762 and peripheral cir-
cuits.
cuits.
YES
NO
Check IC1763 and periph-
eral circuits.
eral circuits.
Is 5 V applied to TL1791?
NO
Check IC1791 and periph-
eral circuits.
eral circuits.
YES
Is 5 V applied to TL1712?
NO
Is 5 V applied to TL1712
with P1703 removed?
with P1703 removed?
NO
Check connection of FB1710.
YES
YES
Is the signal of 180 Hz sent to
TL1716? (When vertical fre-
quency of the input signal is
60 Hz)
TL1716? (When vertical fre-
quency of the input signal is
60 Hz)
NO
Check PHOTO SENSOR
PWB.
PWB.
YES
Is the signal of 180 Hz sent to
TL1706? (When vertical fre-
quency of the input signal is
60 Hz)
TL1706? (When vertical fre-
quency of the input signal is
60 Hz)
NO
Check IC1701 and periph-
eral circuits.
eral circuits.
YES
Check the power PWB.
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