Sharp XG-NV5XB, Service Manual

Page: 43 / 122

43
XG-NV5XB
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-4
C
Yes
Yes
No No
C
Yes
Yes
No No
Yes
Yes
Yes
No No
Yes
Are there signals at TL45 and TL47?
Yes
No No
Yes
No
Are there signals at Pins (179) thru
(187) of IC8020?
IC8020 or its peripheral circuit faulty.
Yes
Yes
No
Are there signals at pins (5) and (6) of
CON4 (P8405) connector?
Are there signals at pins (11) thru (20)
of IC8051?
IC8051 or its peripheral parts faulty.
No
IC 8029 or its perpheral parts faulty.
No
IC8025 or its peripheral circuit faulty.
CON4 (P8405) connector or output
PWB faulty.
Checking the S-
VGA's green video
circuit and its
peripheral circuits Checking the VGA's
green video circuit
and its peripheral
circuits
Yes
No
Are there signals at Pins (185) thru
(177) of IC8020?
Check the video
system's green
video circuit and its
peripheral circuits
Is there signal at pin (8) of IC8004?
Is there signal at pin (8) of IC8004?
LCP circuitry faulty.
Is there signal at the base of Q8006?
Is there signal at the base of Q8006?
IC8004 or its peripheral circuit faulty.
Is there signal at pin (6) of IC8010?
Is there signal at pin (6) of IC8010?
Q8006 and Q8007 or there peripheral
circuit faulty.
Are there signals at Pins (21) thru
(27) and (33) thru (40) of IC8010? Are there signals at Pins (112) thru
(119) of IC8020?
IC8010 or its peripheral circuit faulty.