Hitachi DV-P745U Service Manual page 21

FLOW CHART NO.19
Both functions of picture and sound do not operate normally.
Replace the DVD Main CBA.
No improvement can be found.
Replace the DVD Mecha.
FLOW CHART NO.20
Picture does not appear normally.
Set the disc on the disc tray, and playback.
Are the video signals outputted to each pin of
CN1601 on the AV CBA?
CN1601 3PIN S-Y
CN1601 4PIN Cr
CN1601 6PIN Cb
CN1601 8PIN S-Y
CN1601 10PIN S-C
Are the video signals shown above inputted into
each pin of IC1402, IC1403?
IC1402 3PIN S-Y
IC1402 6PIN Cb
IC1402 8PIN Cr
IC1403 3PIN S-Y
IC1403 1PIN S-C
Are the video signals outputted to each pin
of IC1402, IC1403?
IC1402 13PIN S-Y
IC1402 11PIN Cb
IC1402 10PIN Cr
IC1403 6PIN CVBS
IC1403 5PIN S-Y
IC1403 7PIN S-C
Are the video signals outputted to the specific
output terminal?
Are the luminance signals outputted to the
S-OUT terminal (JK1401)?
Are the chroma signals outputted to the
S-OUT terminal (JK1401)?
Are the component video signals outputted to the
VIDEO OUT terminal (JK1404)?
Are the composite video signals outputted to
the VIDEO OUT terminal (JK1404)?
Yes
Yes
Yes
Yes
No
Original DVD Main CBA is poor.
No
Replace the DVD Main CBA or DVD Mecha.
Check the line between each pin of CN1601 and
each pin of IC1402, IC1403 on the AV CBA, and
No service it if detective.
8PIN → IC1402
CN1601
6PIN → IC1402
CN1601
4PIN → IC1402
CN1601
3PIN → IC1403
CN1601
CN1601 10PIN → IC1403
No
Is 5V voltage applied to the pin(4, 12) of
IC1402, pin(4) of IC1403?
Yes
Replace IC1402,
IC1403.
Check the periphery of JK1401 from
No
Pin (5) of IC1403 and service it if detective.
No Check the periphery of JK1401 from
Pin (7) of IC1403 and service it if detective.
No
Check the periphery of JK1404 from Pins (10, 11,
13) of IC1402 and service it if detective.
No
Check the periphery of JK1404 from Pin(6) of
IC1403 and service it if detective.
3-5
3PIN S-Y
6PIN Cb
8PIN Cr
3PIN S-Y
1PIN S-C
No
Check P-ON+5V line and
service it if detective.