No Picture Or Sound Is Output - Marantz SR7005 Service Manual

5.3. No picture or sound is output

Are video signals output from U4203 pin 27 (Y) and pin 24 (C)?
Check the analog video circuit.
Are S/PDIF signals output to U3000 pin 21?
Check the Digital audio circuit.
Checking the set (SR7005):(If no picture is output)
YES
Checking the set (SR7005):(If no sound is output)
YES
NO
You do not use the USB hub.
NO
U3900 and surrounding circuitry is
defective.
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