Sharp XG-NV2SB Service Manual page 43

TROUBLE SHOOTING TABLE FOR PC I/F UNIT-2
Checking the PLL circuit and its peripheral circuits
Are there signals at pins (4) and (5) of
IC8026?
Yes
Is there signal at pin (236) of IC8025?
Yes
Are there signals at pins (6) and (22)
of IC8015?
Yes
Is there signal at pin (15) of IC8015?
Yes
Check the video circuit and its
peripheral circuits.
Is image as specified at resolution
above S-VGA level?
Yes
Is image as specified at resolution
below S-VGA level?
Yes
Hook up a video system. Is the
display as specified?
Yes
A
No
IC8025 or its peripheral circuit faulty.
No
IC8026 or its peripheral circuit faulty.
No
IC8025 or its peripheral circuit faulty.
No
IC8015 or its peripheral circuit faulty.
No
Check the XGA video circuit and its
peripheral circuits.
No
Check the S-VGA video circuit and its
peripheral circuits.
No
Check the video system's video
circuit and its peripheral circuits.
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XG-NV2SB