Sharp XG-P20XE Service Manual page 39

TROUBLE SHOOTING TABLE
No or unusual Y signal
Is there Y signal input at pin (84) of
IC4502?
Yes
Is there Y signal output at pin (7) of
IC4501?
Yes
Is there Y signal output at pin (5) of
IC4311?
Yes
Check SC4303 and its peripheral
circuits.
(Continued)
No
Check IC4502 and its peripheral
circuits.
No
Check IC4501 and its peripheral
circuits.
No
Check IC4311 and its peripheral
circuits.
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XG-P20XU
XG-P20XE
XG-P20XD