Sharp PG-C20XU Service Manual page 39

Checking the SOG circuit
Using the oscilloscope,
measure the land of R8231
(pin (32) of IC8026). Is
there composite sync
signal?
NO
Using the oscilloscope,
measure the land of R8110
(base of Q8010). Does the
video signal contain the
sync signal?
YES
IC8008, IC8009, IC8031 or
their peripheral circuit
defective.
Checking the video input
Feed the specified video
signal.
Select VIDEO with the
set's key or remote control
button.
Does an image appear?
YES
Is the image disturbed?
NO
Are the colors as
specified?
YES
End
IC8003 or its peripheral
circuit defective.
YES
End
NO
Is there video signal with
sync signal at pin (18) of
IC3002 connection
terminal PWB?
YES
SC3003 or its peripheral
circuit defective.
NO
YES
NO
Go to "Checking the
video sync signal".
39
NO
IC3002 connection
terminal PWB or its
peripheral circuit defective.
YES
Is there video signal at pin
(73) of IC8003?
NO
Is there video signal at pin
(7) of IC3403 connection
terminal PWB?
YES
IC3403 or its peripheral
circuit defective. Or
SC3003 in poor contact.
J3303 or its peripheral
circuit defective.
PG-C20XU
PG-C20XE
AN-Z7T
NO