Sony str-km55 repair (diy)

Hi I have an issue with my centre channel. The output transistors blew and amp was displaying protect mode and the display went off.

I replaced the 2 output transistors and the 2 100ohm resistors that got damaged when it blew.

Now the amp just turns on by itself when ever it is plugged in and the fans just spin but no display. I checked all the fuses and they seem fine. Could it be a faulty relay?