PS pcb 50418e1 rev 1.b

[Nawual]

This plate is from a wine store that does not power on. I checked the primary transistors and one of them was open. I switched the two and also the electrolytic capacitors but it does not work. The LEDs flash continuously and the primary transformer makes a lot of noise. Any idea?
[IMG][/IMG]

[momaka]

Re: PS pcb 50418e1 rev 1.b

Sounds like the PSU is trying to start and then cutting off, restarting, and trying again. So you might want to check the secondary-side driver transistors (the two TO-92 units by the small transformer), all diodes around those driver transistors, and also all diodes and resistors around the primary-side switch transistors.

[Nawual]

Re: PS pcb 50418e1 rev 1.b

Thanks for you help.
I check all that that you said me but nothing wrong.After i have changed the electrolytic capacitors of the secondary side and it works now!.
Although I think the peltier is not going well because it cool but not enough for the wine, it only reaches 18 degrees