Power Supply Pwb Check - Sharp XV-Z3000 Service Manual

Power supply PWB
check
Is 6 V applied to pins (7)
and (8) of the connector
P704?
YES
Is 13 V applied to pins (3)
and (4) of the connector
P704?
YES
Does the lamp turn on?
YES
Check the main PWB.
Are connectors P704 and
CN901 fully inserted?
YES
Is DC voltage of 380 V
applied to both ends of
C704?
YES
Is R766 in the OPEN
status?
YES
Check circuits R766 and
after or replace R766.
NO
1
NO
Check peripheral circuits of
IC703.
NO
NO Securely insert the
connectors.
NO
Is pin (11) of the connector
P704 at "H"?
YES
Check peripheral circuits
of IC902.
Is LAMP-COM signal
properly sent to pin (14) of
NO
the connector P704?
(Refer to the waveform
chart 1.)
YES
Are GATE waveforms of
Q901 and Q903
appropriate?
(See waveform diagram
8.)
31
NO
Check the main PWB.
NO
Check the main PWB.
NO
Check the ballast PWB.
XV-Z3000
DT-500