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TROUBLE SHOOTING FLOWCHART
Snow noise increase
Does approx.30V appear
at pin (9) of TU201(tuner)
Check TU201 and their
peripheral parts.
NO PICTURE
Does the snow noise appear on
the CRT at max contrast and
brightness control?
Check L202, D759 and
R761
Check R651(Heater), Screen
connection and Peripheral
circuits of T630(FBT) and CRT
No Snow noise
Check pin(1) and (2) of
IC201
(Noise or signal appear)
Check pin(12) of (SE)
(Noise)
connector
Does noise or signal appear?
(Signal)
Check IC4003 RGB output
Normal?
Check pin(3) of IC1801,
IC1802, IC1803 Signal or
Noise?
Check TU201(tuner),
SF201 and Peripheral
parts.
Check IC201, Q205 and
their Peripheral circuits.
Check IC4003 and their
Peripheral circuits.
Check "KY" connection,
IC1801, IC1802, IC1803
and their Peripheral circuits
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