Sharp XG-MB70X Serviceanleitung Seite 39

Checking the RGB input
Send RGB signals to INPUT1
or INPUT2. Use keys on the
main unit or remote control to
select INPUT1 or INPUT2.
Are sync signals input to pins
(30) and (31) of IC3005?
YES
Are picture signals input to pins
(43), (48) and (54) of IC3005?
NO
Are picture signals input to
pins (2), (5), (11), (3), (6) and
(10) of IC3003?
YES
Are picture signals input to pins
(1), (5) and (8) of IC4003, and
pins (1), (5) and (8) of IC4004?
YES
Check SC4003, SC4001 and
peripheral circuits.
YES
Are picture signals input to pins (43),
(48) and (54), and sync signals input
to pins (30) and (31) of IC3005?
YES
Are sync signals output from pins
(64), (65) and (66), and sine wave
output from pin (67) of IC3005?
YES
Are signals input to pins (56),
(58), (62) and (64) of SC2501?
YES
Go to "Checking the peripheral
circuits of the formatter".
NO
Go to "Checking the sync
signal".
YES
1
NO
When toggling between INPUT1
and INPUT2 by using keys on
the main unit and remote
control, does the voltage of pin
(1) of IC3003 change?
Replace IC3003.
NO
When toggling between INPUT1
and INPUT2 by using keys on
the main unit and remote control,
does the voltage of pins (2), (4)
and (7) of IC4003, and pins (2),
(4) and (7) of IC4004 change?
Replace IC4003 or IC4004.
NO
Check IC3106, 3107, 3108
and peripheral circuits.
1
NO
Check IC3005 and peripheral
circuits.
NO
Check IC8001 and peripheral
circuits.
NO
YES
NO
YES
39
XG-MB70X
Check Q3123, IC2003 and
peripheral circuits.
Check IC4009, IC2003 and
peripheral circuits.