Sharp XG-NV2SB, Service Manual

Page: 42 / 148

42
XG-NV2SB
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-1
Checking the clock circuit and its peripheral circuits
Yes
No
Is X8002 oscillating?
X8002 or its peripheral part faulty.
Yes
No
Is pin (3) of IC8001 oscillating?
No
Does pin (63) of IC8001 function?
C8288 or its peripheral part faulty.
IC8001 or its peripheral circuit faulty.
Yes
Check the sync signal circuit and its
peripheral circuits.
No
Are there signals at pins (275) thru
(277) of IC8025?
LCP circuitry faulty.
Yes
No
No
Are there signals at pins (141), (145),
(148) and (150) of IC8020?
IC8025 or its peripheral circuit faulty.
Yes
Is the input having a resolution below
S-VGA level or in the video mode?
Yes
Yes
No
Are there signals at pins (13), (14),
(43) and (44) of TC2 connector?
IC8025 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (238) and
(239) of IC8025?
IC8020 or its peripheral circuit faulty.
Go to "Checking the PLL circuit and
its peripheral circuits".