Meanwell 48v problem - FIXED !!!!

[Ypedal]

top of the board.. the unit on the left is the one with most carnage....

how do i test these things ?..

MW-repair4.JPG (41.04 KiB) Viewed 92 times

And the underside.. copper missing..

I'd solder in a piece if i knew or understood what goes where..

[Ypedal]

alright.. so here is my best guess as to how this should go.....

anyone wanna pipe in before i plug this in again ?

* ( yes.. WITH the grey insulator thing this time )

[hydro-one]

haha thats how u learn ........ u found the membrane hahaha

[Ypedal]

yeah.. learn as i go..

So this time i took it outside to an isolated circuit ( garage sub panel, not in the office with my PC and other sensitive electronics )

Plugged it into a power bar, hit the switch, no smoke, no pop, no output..grrrrr..

[Ypedal]

hey.. does the polarity on that toroid ( round do-nut looking thing wrapped in copper ) matter?

Looking at the goop residue left, i put it in backwards from what it used to be .. if that matters..

anyone ?

---

getting nothing at the output at all, green LED not lighting up.

[heathyoung]

Nope doesn't matter (polarity - its just a coil of wire).

You gone and shorted rectified mains to earth. Oops. Test the base drive resistors, they end up as fuses on these as well. If your transistor isn't shorted (would have taken out the fuse as well) then you may have wrecked more semiconductor havoc in the bridge rectifier, or turned something else into a fuse