Sharp PG-A20X Service Manual page 37

Checking the S-video
system
Is the lamp on ?
YES
Is the specified voltage EA
connectors?
YES
Is the video signal inputted
into the pins(43) and (44)
of IC3105?
YES
Go to "Checking IC3102"
Checking the video
system
Is the lamp on ?
YES
Is the specified voltage EA
connectors?
YES
Is the video signal inputted
into the pin(7) of IC3506?
YES
Is the video signal
outputted from the pins(25)
and (27) of IC3506?
YES
Is the signal inputted into
the pins(39) and (41) of
IC3105?
YES
Check IC3105 and its
peripheral circuits.
NO
Go to "Lamp light-up".
NO
Check power circuit and its
parts.
NO
Check the video terminal
and its peripheral circuits.
NO
Go to "Lamp light-up".
NO
Check power circuit and its
peripheral parts.
NO
Check the video terminal
and its peripheral circuits.
NO
Check IC3506 and its
peripheral circuits.
NO
Check Q3501, Q3502 and
their peripheral circuits.
NO
Check IC1103 and its
peripheral circuits.
37
PG-A20X