Electronics > Repair
Help Please, Switching Power supply shutting stright off.
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JFerris321:
Testing has been done both with and with out a load attached, it does not seem to make an difference to the results.
asis:
You said you replaced some ECAP's.
The most vulnerable is ECAP C8 (10mF x 25-50V?).
Check C8 & C9 carefully by disassembling them.
Or replace it.
JFerris321:
C8 (10uf 50v) and C9 (0.68uf 50v) have both been replaced already, C8 was dried up and measured out of spec, C9 was okay but changed it anyway just in case. Have checked the new caps they seem fine, also tried the original C9 back in the supply it made no diffrence.
tautech:

--- Quote from: JFerris321 on June 09, 2024, 01:10:18 am ---C8 (10uf 50v) and C9 (0.68uf 50v) have both been replaced already, C8 was dried up and measured out of spec, C9 was okay but changed it anyway just in case. Have checked the new caps they seem fine, also tried the original C9 back in the supply it made no diffrence.

--- End quote ---
C8 is on controller VCC rail, right ?
Sounds like the controller is kicking off but dropping out due to its UVLOCKOUT.
Than means VCC supply is not fully working and the flyback diode would then be your first suspect.
Poroit:
Looking at your original post where you said the PSU was working out of the case at 11.6V.
Did you try adjusting the trimpot to see if it increased the output?

Also...when you put it back in the case and power it up...does it trip your home/workshop Earth Leakage Breaker
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