Hitachi DV-PF73U Service Manual page 25

FLOW CHART NO.9
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 Main CBA?
CN1601 7PIN S-Y
CN1601 9PIN S-C
CN1601 5PIN Cb
CN1601 3PIN Cr
Are the video signals shown above inputted into
each pin of IC1402?
IC1402 6PIN S-Y
IC1402 2PIN S-C
IC1402 9PIN Cb
IC1402 11PIN Cr
Are the video signals outputted to each pin
of IC1402?
IC1402 21PIN CVBS
IC1402 18PIN S-Y
IC1402 23PIN S-C
IC1402 15PIN Cb
IC1402 13PIN Cr
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 (JK1403)?
Are the composite video signals outputted to
the VIDEO OUT terminal (JK751)?
Are the composite video signals outputted to
Pin(15) of IC751?
Are the "H" pulse inputted into Pins(9,10,11) of IC751?
Check the line between Q760 and OUTPUT SELECT,
and service it if detective.
3-6
Yes
Yes
Yes
No
No
No
No
Replace the DVD Main CBA or the DVD
Mecha.
Check the line between each pin of CN1601 and
each pin of IC1402 on the Main CBA, and service
it if detective.
No
CN1601 7PIN → IC1402
CN1601 9PIN → IC1402
CN1601 5PIN → IC1402
CN1601 3PIN → IC1402 11PIN Cr
Check P-ON+5V line and service it if detective.
No
Is 5V voltage applied to the Pin(1, 24) of
IC1402?
Replace IC1402?
Check the periphery of JK1401 from
No
Pin (18) of IC1402 and service it if detective.
Check the periphery of JK1401 from
No
Pin (23) of IC1402 and service it if detective.
Check the periphery of JK1403 from Pins (13, 15,
No
18) of IC1402 and service it if detective.
No
Yes
Check the line between Pin(15) of IC751 and JK751
and service it if detective.
Yes
Replace IC751.
6PIN S-Y
2PIN S-C
9PIN Cb
No
Yes