Sharp PG-F320W Service Manual page 34

PG-F320W
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
The lamp light-up. After about 30 sec-
onds, the TEMP LED flash red and
the lamp turn off.
NO
Is approx. 3 V applied to TL1721?
YES
Is 12 V applied to TL1761?
YES
Is 2.5 V applied to TL3801?
YES
Is 5 V applied to TL3814?
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.
YES Check the TEMP1 and TEMP0
signal line.
NO Check peripheral circuits of Q1721.
NO Check IC1761, IC3802 and peripheral
circuits.
NO Is 3.3 V applied to TL3802?
NO
Check L3801 and peripheral
circuits.
NO Check L3806 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.
5 – 6
Go to "DMD system check".
YES Check L3802 and peripheral
circuits.
NO Check connection of FB1710 and
Q1707 and Q1708.