Yamaha RX-V483 - dead

[ponteley]

Yamaha RX-V483 dead. No 5.5V on secondary.
Tested all fuses, diodes, transistors and caps.
Unsoldered transformer, - seems to ring trough on all coils. Fuses are OK. Primary DC voltage 160V. I suspect 3A453 IC, but I can't find replacement or substitute anywhere.

Please help.

Thank you.

[easy_mike]

Re: Yamaha RX-V483 - dead

Do you have a schematic or service manual?

- does 3A453 IC get the supply voltage?
- are there any optocouplers on that board?
- does the circuit make any sound whatsoever when turned on? Clicks, silent beeps?

[redwire]

Re: Yamaha RX-V483 - dead

OP why did you cross-post pics here and leave us nothing?