[Dead] SCX-5637FR

[groovy]

Hi there,
my scx-5637fr has a strange issue
Powers up, display say "initializing", then just after "warming up" turns off and on the main power
Changed the SMPS board with no effect.
Disconnected the main fuser power supply with no effect.
Fuser seems is warming up (a little bit because of the power cycle)
What is the next board to investigate? The HVPS or the fuser itself?

[groovy]

Re: SCX-5637FR

News update: after disconnecting the cable to the main motor it seems booting up and stay on....