Sharp XV-Z12000 II Service Manual page 39

Checking IC3503 (3D Y/C
separation) and its
Peripheral Circuits
Are there the input signals
at pins (93) (Y signal) of
IC3503?
YES
Are there the output
signals at pins (89) (Y
NO
signal) and (88) (C signal)
of IC3503?
YES
Check the line up to the
PC board connector or
the circuits that follow the
PC board.
Checking the
Component and RGB
Inputs
Are there signals at pins
(34), (36) and (38) of
IC2505?
YES
Are there signals at pins
(60/30),(58/28),(56/26) and
(51/21) on the board-to-
board section of P3580?
YES
Check the board-to-board
connections or the
circuits that follow the PC
board.
NO
Check the signal input
circuit or IC2505 and its
peripheral circuits.
Check IC3503 and its
peripheral circuits.
NO
Check the signal input
circuit or IC2505 and its
peripheral circuits.
NO
Check the line from
Q2518 through Q2520 to
Q2523 and its peripheral
circuits.
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