Sharp DV-740/T, Руководство по обслуживанию

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9
DV-740/X/W/T
Picture does not operate normally.
Set the disc on the disc tray.
Are the video signals outputted to the pins
of video encoder chip U11?
U11 32PIN CVBS
U11 27PIN S-Y/YUV-Y
U11 26PIN S-C/YUV-Cr
U11 31PIN YUV/Cb
Is the setup menu “TV OUTPUT” set
correct?
YES
YES
Set it correct.
NO
NO
Check other pin of
U11.
Make sure
Pin38-42, 2-4;
Pin23 SCLOCK,
Pin24 SDATA,
Pin44 CLOCK
work normally.
Replace U11.
YES
NO
Check U1.
Are the video signals outputted to each
emitter of the Q12, Q17, Q18, and Q19?
Q12, Q17, Q18, Q19 is video buffer.
Q12: YUV-Y/S-Y
Q18: YUV-Cr/S-C
Q17: YUV-Cb
Q19: CVBS
Check the each buffer
and each filter.
NO
YES
Are the video signals outputted to the
specific output terminal?
Are the composite video signals outputted
to the Video Out terminal (Pin1 of P5)?
Are the Y/C signals outputted to the
S-Video out terminal (Pin5, 3 of P5)?
Are the YUV signals outputted to the YUV
Out terminal (Pin1, 2,3 of P5)?
YES
Check the connect circuit from
Q19 to P5.
Check the connect circuit from
Q12 and Q18 to P5.
Check the connect circuit from
Q12 and Q17 and Q18 to P4.
NO
NO
NO