Sharp 29L-FG1L, Service Manual

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29L-FG1L
4 – 5
No snow noise
Check pin 104 &
105 of IC 2100.
Normal
Abnormal
Noise or signal
appear.
Check TU 51 (Tuner),
SF 202 and its
related circuit.
Does AV input at
AV1 & AV2 normal ?
Check pin 71 & 78 of
IC 2100. Does signal
or noise appear ?
NO
Check IC 2100 and
its related circuits.
YES
Check circuit
between AV-in
terminal and pin 71 &
78 of IC 2100.
NO
YES
Check IC 2100 RGB
out at pin 42, 43 & 44.
Is the output normal ?
Check IC 2100 and
its related circuit.
NO
YES
Does signal output
at pin 7, 8 & 9 of
IC 851 normal ?
Check IC 851 at
input pin 1, 2 & 3
and its related
circuit.
NO
Check the related
circuit of screen
heater (FBT) and
A
YES
the CRT.