Sharp PG-C30XU - TROUBLE SHOOTING TABLE FOR PC I;F UNIT-6; Checking the OSD circuit and its peripheral circuits; Checking the remote control

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PG-C30XU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-6
Checking the OSD circuit and its peripheral circuits
Yes
Display OSD on the screen.
Yes
No
Are there signals at pins (56), (58),
(71) and (72) of IC8048?
IC8029 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (12), (14)
thru (17) and (20) of IC8048?
IC8048 or its peripheral circuit faulty.
Yes
No
Are there signals at pins (23) thru
(42) of IC8048?
IC8046, IC8047 or their peripheral
circuit faulty.
IC8048 or its peripheral circuit faulty.
IC8001 circuit faulty.
Checking the remote control
Yes
No
Run the remote control. Are there
signals at pin (59) of CON4 (P8405)
connector?
output PWB faulty.