820-02773-a A2338 short

[lincev]

Hello, I received this device, it does not turn on and there are no liquid damages. I bought the F5200 and I have a short to ground with a value of 002

I have checked the coils and the mains and they seem to be fine

Any ideas? Thanks

 

[2informaticos]

Which side of the fuse remains the short to ground?

 

[lincev]

ups !! sorry I forgot to put it

in PIN: 2 PPBUS_AON

 

[2informaticos]

Check if any coil gives the same reading.

 

[lincev]

All the large/medium coils seem to be fine, I have values of 3.8, 8.5, etc.

I checked pin2 of F5200 again but the value is 000, 002 has disappeared

 

[2informaticos]

I hope you meant F5200.
So the short is on PPBUS_AON power rail.

If no secondary coil shorted, then is safe to inject voltage.
With such (pure) short, 1-2V should be enough to find the culprit.
Set first amp limit to max on lab PSU.

 

[lincev]

nice problem is CR634

thanks so much