Sharp 9Q-FG1A - Page 23

29Q-FG1A/1F/1N/1S/1U
4 – 5
No snow noise
Check pin 45 &
46 of IC 1100.
Abnormal (No
signal or noise)
Noise or signal
appear.
Check TU 251
(Tuner), SF 202 and
its related circuit.
Does AV input at
AV1 & AV2 normal ?
Check pin 29 & 31 of
IC 1100. Does signal
or noise appear ?
NO
Check IC 1100 and
its related circuits.
YES
Check circuit
between AV-in
terminal and pin 29 &
31 of IC 1100.
NO
YES
Check IC 1100 RGB
out at pin 6, 7 & 8.
Is the output normal ?
Check IC 1100 and
its related circuit.
NO
YES
Does signal output
atpin7,8&9of
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.