Sharp PG-C30XU - No or unusual Y signal; No or unusual horizontal sync; No or unusual vertical sync

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PG-C30XU
TROUBLE SHOOTING TABLE (Continued)
No or unusual Y signal
Yes
No
Go back to the signal processing
block.
No
Check IC801 and its peripheral
circuits.
Yes
No
Check IC803 and its peripheral
circuits as well as IC805 (AGC).
Yes
Check IC803 and its peripheral
circuits.
Is there Y signal output at pin (17) of
IC803?
Is there Y signal output at pin (40) of
IC801?
Is there Y signal input at pin (21) of
IC801?
No or unusual horizontal sync
Yes
No
Check IC801 and its peripheral
circuits.
Yes
No
Is there horizontal sync pulse output
at pin (9) of IC603?
Check the pulse shaping circuit of
IC602 and IC603.
Check IC604 and its peripheral
circuits, and go to "Trouble shooting
table for PC I/F unit".
Is there horizontal sync pulse output
at pin (56) of IC801?
No or unusual vertical sync
No
Check IC801 and its peripheral
circuits.
Yes
Check IC604 and its peripheral
circuits, and go to "Trouble shooting
table for PC I/F unit".
Is there vertical sync pulse output at
pin (4) of IC801?