45
VC-A422U
VC-H822U
Picture E-E does not appear.
Is the picture signal input into pins(30) and (31) of IC201?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
1
External input mode
Check the line between the rear video input terminal
and pin(30) of IC201.
2
U/V tuner mode
Check the line between the pin(25) of U/V tuner and
pin(31) of IC201.
Is the picture signal output from pin(52) of IC201?
Is the picture signal input into pin(49) of IC701?
Is the picture signal output from pin(47) of IC701 ?
Check the line between pin(52) of IC201
and pin(49) of IC701.
Check the line between pins(63) and (62) of
IC201 and pins(56) and (57) of IC701.
Is the picture signal output from the emitter of video
output buffer (Q251)?
1
Line output: Check Q251 periphery and output terminal periphery.
2
RF output: Check Q251 periphery and tuner pin(6) periphery.
Is 5V applied to pins(12), (61) and (90) of IC201?
Is 5V applied to pin(51) of IC701?
Check the PC 5V line.
Check the AT 5V line.
Is the serial data clock signal applied to
pins(63) and (62) of IC201?
Check Q251 periphery.
FLOW CHART NO.17
Summary of Contents for VC-A422U
Page 51: ...VC A422U VC H822U VC A422U VC H822U 52 53 SIGNAL FLOW BLOCK DIAGRAM VC A422U ...
Page 52: ...VC A422U VC H822U VC A422U VC H822U 54 55 SIGNAL FLOW BLOCK DIAGRAM VC H822U ...
Page 53: ...56 VC A422U VC H822U POWER CIRCUIT BLOCK DIAGRAM ...
Page 63: ...72 VC A422U VC H822U M E M O ...
Page 76: ...85 VC A422U VC H822U M E M O ...
