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4. Picture normal, but no sound
Check power amplifier
relative pins have square-
wave signal output.
Yes
Check power
amplifier rear
stage peripheral
circuit.
Check NV06
corresponding
channel has signal
input.
Yes
Check NV06
peripheral circuit
and its power
supply.
Picture is OK,
but no sound.
Check main
board XV05 has
signal output.
No
No
Check CV18,
CV22 have signal
input amplification.
No
Yes
Check power
amplifier's peripheral
circuit, the power
supply and MUTE pin
circuit.
No
Check every stage
circuit along the
audio input channel
15
Yes
Speaker problem
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