Sharp VC-H992U, Service Manual

Page: 45 / 82

VC-H992U
VC-H992U(A)
45
Picture E-E does not appear.
Is 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 picture signal output to the pin(52) of IC201?
Is picture signal input into the pin(49) of IC701? Is picture signal output to the 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 picture signal output to 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 the pins(12), (61) and (90) of IC201?
Is 5V applied to the pin(51) of IC701?
Check the YC 5V line.
Check the AT 5V line.
Is serial data clock signal applied to the pins(63) and (62) of IC201?
Check Q251 periphery.
FLOW CHART NO.18