116
Checking the set (AVR-4520):(If no picture is output)
Check the analog video circuit.
Are video signals output from U607 pin 27 (Y) and pin 24 (C)?
U607 and surrounding circuitry is defective.
NO
Checking the set (AVR-4520):(If no sound is output)
YES
YES
Check the Digital audio circuit.
Are S/PDIF signals output to N605 pin 7? U503 and surrounding circuitry is defective.
NO
5.3. No picture or sound is output
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