Sharp 29F-PE550 - Page 38

29F-PE550 / 29F-PD570
4 - 5
No snow noise
Check pin 45 &
46 of IC 1100.
Abnormal
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
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.
(No signal or noise)