Sharp XG-NV2SB Service Manual page 42

XG-NV2SB
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-1
Checking the clock circuit and its peripheral circuits
Is X8002 oscillating?
Yes
Is pin (3) of IC8001 oscillating?
Yes
Does pin (63) of IC8001 function?
Yes
Check the sync signal circuit and its
peripheral circuits.
Are there signals at pins (275) thru
(277) of IC8025?
Yes
Are there signals at pins (141), (145),
(148) and (150) of IC8020?
Yes
No
Is the input having a resolution below
S-VGA level or in the video mode?
Yes
Are there signals at pins (238) and
(239) of IC8025?
Yes
Are there signals at pins (13), (14),
(43) and (44) of TC2 connector?
Yes
Go to "Checking the PLL circuit and
its peripheral circuits".
No
X8002 or its peripheral part faulty.
No
C8288 or its peripheral part faulty.
No
IC8001 or its peripheral circuit faulty.
No
LCP circuitry faulty.
No
IC8025 or its peripheral circuit faulty.
No
IC8020 or its peripheral circuit faulty.
No
IC8025 or its peripheral circuit faulty.
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