Sharp PG-C30XU - TROUBLE SHOOTING TABLE FOR PC I;F UNIT-2; Checking the PLL circuit and its peripheral circuits

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PG-C30XU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-2
Checking the PLL circuit and its peripheral circuits
Yes
No
Are there signals at pin(111) of
IC8606 and TL8606?
IC8025 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (100) and
(101) of IC8606?
IC8606 or its peripheral circuit faulty.
Check the video circuit and its
peripheral circuits.
No
Is image as specified at resolution
above XGA level?
Check the S-XGA video circuit and
its peripheral circuits.
Yes
No
Is image as specified at resolution
below XGA level?
Check the VGA video circuit and its
peripheral circuits.
Yes
No
Hook up a video system. Is the
display as specified?
Check the video system’s video
circuit and its peripheral circuits.
Yes
A