Sharp XG-MB50X Service Manual page 36

XG-MB50X
XR-11XC
XR-10X/S
XR-20X/S
Check when the lamp turns
off soon after turning on
Have connectors P1703,
P1721, P1722, P1723 and
P1724 come off or are they
loose?
NO
Is each cooling fan
rotating?
YES
Is approx. 3 V applied to
TL1721?
YES
Is 12 V applied to TL1761?
YES
Is 2.5 V applied to
TL1763?
YES
Is 5 V applied to TL1791?
YES
Is 5 V applied to TL1712?
YES
Is the signal of 180 Hz
sent to TL1716?(When
vertical frequency of the
input signal is 60 Hz)
YES
Is the signal of 180 Hz
sent to TL1706? (When
vertical frequency of the
input signal is 60 Hz)
YES
Check the power supply
ballast PWB.
YES
Securely insert the
connectors.
NO
Check the cooling fan.
NO
Check peripheral circuits of
Q1721.
NO
Check IC1761, IC3581 and
peripheral circuits.
NO
Is 3.3 V applied to TL1762?
NO
Check IC1763 and
peripheral circuits.
NO
Check IC1791 and
peripheral circuits.
NO
Is 5 V applied to TL1712
with P1703 removed?
YES
NO
Check PHOTO SENSOR
PWB.
NO
Check IC1701 and
peripheral circuits.
36
Go to "DMD system check".
YES
Check IC1762 and
peripheral circuits.
NO
Check connection of
FB1710.