Read Sharp XG-XV2E (serv.man2) Service Manual online
37
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Yes
Yes
No
No
Is there signal at pin (3) of IC8004?
Is there signal at pin (3) of IC8004?
LCP circuitry faulty.
Yes
Yes
No
No
Is there signal at pin (3) of IC8006?
Is there signal at pin (3) of IC8006?
IC8004 or its peripheral circuit faulty.
Yes
Yes
Yes
No
No
Is there signal at pin (6) of IC8009?
Is there signal at pin (6) of IC8009?
IC8006 or its peripheral circuit faulty.
Yes
No
No
Are there signals at BI1A0 thru -7 and
BI1B0 thru -7 of IC8025?
BI1B0 thru -7 of IC8025?
Are there signals at VAB0 thru -7 of
IC8020?
IC8020?
IC8009 or its peripheral circuit faulty.
Yes
No
Are there signals at BI2A0 thru -7 and
BI2B0 thru -7 of IC8025?
BI2B0 thru -7 of IC8025?
IC8020 or its peripheral circuit faulty.
Yes
No
Are there signals at R1 thru -10 and
G1 thru -10 of IC8032?
G1 thru -10 of IC8032?
IC8025 or its peripheral circuit faulty.
Yes
No
Are there signals at the bases of Q23
and Q25?
and Q25?
IC8032 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (1) and (3) of
TC2?
TC2?
Q13, Q22 thru Q25 or their peripheral
parts faulty.
parts faulty.
TC2 connector or output PWB faulty.
Checking the XGA's
blue video circuit
and its peripheral
circuits
blue video circuit
and its peripheral
circuits
Checking the VGA's
blue video circuit
and its peripheral
circuits
blue video circuit
and its peripheral
circuits
Yes
No
Are there signals at VBB0 thru -7 of
IC8020?
IC8020?
R8279, R8280 or LCP circuitry faulty.
Check the video
system's blue video
circuit and its
peripheral circuits.
system's blue video
circuit and its
peripheral circuits.
D
D
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