Something wiped out the memory and the region code needs to be reset. I would suggest taking it into a shop that knows how to do this as I'm not sure that Yamaha wants the procedure sent out to the general public
SOURCE: Yamaha RX-V660 Display Light Out
if you not tech ..suggest send to service
this problem is display negative voltage missing......or display driver ic bad.....
SOURCE: Display is permanently "off" on the Yamaha RX-V620
Sounds like the LED that lights up the display has burnt out. An easy fix, if you're not afraid to take the front panel apart and resolder a new one.
SOURCE: Yamaha Amp RX-V1700B Receiver - no power to head unit
Go to the shop.
Testimonial: "Thanks - I came to the same conclusion myself - hopefully something simple and not too expensive."
SOURCE: i have a yamaha rx-v2700
Service Manual can aid you with the troubleshooting,
Audio Yamaha RX... - Electronics Repair
It is number 55 on the list.
Only with a fee.
Your unit , besides the standby transformer , there
is a much bigger transformer that supplies
voltages to the Amplifiers.
These amplifiers will not operate without the necessary
split supply ,
These power transformer will not have output voltages
if the primary windings are open.
( open meaning no internal resistance ).
If these transformer is not open,
Check for low voltage regulators that activates ( latch )
the relay that turns On your Power transformer.
If these are OK , three ( 3 ) things to check
a) check Micro
b ) check for cold solder joints
c ) check for possible shorted power
Transistors
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