SE/30 rebooting problem with screenshot

[macclassic]

My SE/30 has now started rebooting by itself in a vicious loop, and "extensions off" makes no difference.

On a couple of switch on's it also displayed the shown pattern for a couple of seconds, which then disappears before it tries to boot?

 

[dochilli]

Check the voltage of the AB. May me low voltages. Must be 12 and 5 V. Voltages can be checked at the floppy port.

Is the logic board recapped?

Check the reset button. Can be the cause, if it is

Reseat Rom and Ram.

 

[macclassic]

Yes it's been recapped.

But I've just checked the voltages at the port and the 12V is reading 12.72v and the 5v is fluctuating between 4.59 and 4.62v :-(

 

[Bolle]

That’s right on the edge of when one of the Sony soundchips resets the system.

The Sony PSU is easy to recap, that’s what I would start with. I think there’s even a list of the needed caps around here somewhere...

 

[jessenator]

list of the needed caps around here somewhere

I just keep snagging the one on JDW's re-capping video  
https://docs.google.com/spreadsheets/d/18X-EN67lQdZ2crCBAlkHrtqCCoJK6cLw_BkIYdlJvgs/edit#gid=0

 

[macclassic]

Thanks for the help and assistance in this matter.

I've just swapped in a spare power supply producing 4.9v and the problem has gone.

The recap will have to wait