Sharp VC-MH705HM/LM Service Manual page 27

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Is picture signal output to the emitter of video output buffer
(Q251)?
FLOW CHART NO.19 E-E MODE TROUBLESHOOTING
No picture E-E signal. (by pass)
Is picture signal input into the pins(31) and (32) of IC201?
YES
Is picture signal outputted to the pin(52) of IC201?
YES
YES
1 Line output: Check video output buffer(Q251) peripheral and output terminal periphery.
2 RF output: Check video output buffer(Q251) peripheral and video input terminal of RF converter periphery.
Digitized in Heiloo the Netherlands
Check the line between pin(24) of TU101 and pin(31) of IC201.
NO Check the line between external video input terminal (J201) and
pin(31) of IC201.
Check the line betweem video input terminal and pin(28) of IC201.
Is supply voltage of 5V(Y-Vcc) fed to the pin(12) of IC201?
YES
Check the PC 5V line.
Is there Y/C serial data and Y/C signal clock applied
to the pins(63) and (62) of IC201?
Check the line between pins(63) and (62) of IC201
and all the way up thru to pins(84) and (85) of IC701.
NO
Check peripheral circuit of Q251.
NO
NO
NO
6/17/2019
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