21KF-80F
NO PICTURE, NO SOUND
Does the noise level increase at
max.
Contrast, Brightness and Sound
Noise increase but .
No snow noise.
No signal is received.
Check the tuner supply voltageDoes noise or signal appear
LB must be approx 5V.at pin40 of IC801?
BT must be approx. 32V,
and CH preset data check.
Does noise orCheck IC801and
signal appear atits related
pin38 of IC801?circuit.
Check the Tuner
Check Q401,
AGC at TP201.Does noise or
Q402 and its
signal appear at
related
pin23 and 24
circuit.
of IC801?
Check pin27
Check pin38of IC801, TunerCheck pin1,2Check pin37
of IC801.and related of (SA), Tunerof IC801and
circuit.and related related
circuit.circuit.
NO SOUND
Check IC3001and
Does signal appear
its related
at pin6 of IC302 / 303?
circuit.
Does signal appear
at pin2 of IC302 / 303?
Check IC302 / 303
Check Speaker.and peripheral
circuit.
38 |