Sharp AN-S422U, Service Manual

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45
XG-V10WU
AN-SD1U/S422U
TROUBLE SHOOTING TABLE
(Continued)
Yes
Checking the output PWB unit
Is there signal input at
SC6801?
Are voltages applied to EA
connectors and SC8404,
SC8405 and SC8502?
Yes
No
No No
Check IC2101, IC2102,
IC2201, IC2202, IC2301,
IC2302 and their peripheral
circuits.
Are there signal outputs at
pins (17) of IC2101, IC2102,
IC2201, IC2202, IC2301,
IC2302?
Yes
No
Are there signal inputs at pin
(47) of IC1101, IC1102,
IC1201, IC1202, IC1301 and
IC1302?
Yes
No
Check IC1101, IC1102,
IC1201,IC1202, IC1301,
IC1302 and their peripheral
circuits.
Are there signal outputs at pins
(17), (19), (21), (28), (30) and
(32) of IC1101, IC1102,
IC1201, IC1202, IC1301 and
IC1302?
Yes
Yes
No
If there is no signal input at
pins (15) and (30) of
SC1101, SC1201 and
SC1301, check IC1601
and their peripheral
circuits.
No
If there is no signal input at
pins (1) and (32) of SC1101,
SC1201 and SC1301, check
the switching circuit and
amplifier circuit of IC1101,
IC1201, IC1301, IC1102,
IC1202, IC1302 and their
peripheral circuits.
Are there signal inputs at
SC1101, SC1201 and
SC1301?
Check IC1611, IC1612,
IC1613, IC1615, IC1621,
IC1622, IC1623, IC1624
and their peripheral
circuits.
Check the R, G and B panels.
If there is no signal at EA
connector or SC8404, SC8405
and SC8502, go to Checking
the power unitblock.
If there is no signal at SC8404
and SC8405, go to "Trouble
shooting table for PC I/F unit".
If there is no signal at SC6801,
go to the video system block.
Check IC2101, IC2102, IC2201,
IC2202, IC2301, IC2302 and
their peripheral circuits.