Picture Does Not Appear Normally. (Tuner Input / Video Input/S-Video Input.); Picture Does Not Appear Normally. (Y / Pb / Pr Input.) - Sharp LC-15AV1U Service Manual

2. VIDEO SIGNAL SECTION
FLOW CHART NO.23

Picture does not appear normally. (Tuner input / Video input/S-Video input.)

Are the video signals inputted to the specific
input terminal?
Are the luminance signals inputted to the
Pin(1) of IC781?
Are the chrominance signals inputted to the
Pin(13) of IC781?
Are the component video signals inputted to the
Pin(5) of IC781?
Are the component video signals inputted to the
Pin(3) of IC781?
Yes
Are the video signals outputted to the specific
output terminal?
Are the luminance signals outputted to the
Pin(15) of IC781?
Are the chrominance signals outputted to the
Pin(14) of IC781?
Are the component video signals inputted to the
Pin(4) of IC781?
Yes
Are the video signals outputted to the specific
output terminal?
Are the luminance signals outputted to the
Pin(9) of CN103A?
Are the chrominance signals outputted to the
Pin(7 of CN103A?
Are the component video signals inputted to the
Pin(11) of CN103A?
Yes
Replace LCD MAIN CBA UNIT or LCD MODULE.
FLOW CHART NO.24

Picture does not appear normally. (Y / Pb / Pr input.)

Are the video signals outputted to the specific
input terminal?
Are the Y signals outputted to the Pin(5) of
CN103A?
Are the Pb signals outputted to the Pin(3) of
CN103A?
Are the Pr signals outputted to the Pin(1) of
CN103A?
Yes
Replace LCD MAIN CBA UNIT or LCD MODULE.
Check the line between each pin of IC781 and input
terminal and service it if defective.
No
Check the line between Pin(1) of IC781 and JK721,
and service it if defective.
No
Check the line between Pin(13) of IC781 and JK721,
and service it if defective.
No
Check the line between Pin(5) of IC781 and JK722,
and service it if defective.
No
Check the line between Pin(3) of IC781 and TU1,
and service it if defective.
No
Check IC781 and the periphery circuit,
and service it if defective.
No
No
Check the line between each pin of IC781 and CN103A
and service it if defective.
No
Check the line between Pin(15) of IC781 and Pin(9)
of CN103A, and service it if defective.
No
Check the line between Pin(14) of IC781 and Pin(7)
of CN103A, and service it if defective.
No
Check the line between Pin(4) of IC781 and Pin(11)
of CN103A, and service it if defective.
Check the line between each input terminal and CN103A
and service it if defective.
No
Check the line between JK726 and Pin(5)
of CN103A, and service it if defective.
No
Check the line between JK727 and Pin(3)
of CN103A, and service it if defective.
No
Check the line between JK728 and Pin(1)
of CN103A, and service it if defective.
6-7
L0370TS