Hi,
I have a mining rig powered by solar, I wanted to power it 24 hours a day by solar and batteries,
I got another 1000w psu (it needs to be 1000w to run the rig) to test where I could connect 12v (missing out the 240v reducing coil) I was hoping to let the psu do the dc step down to 5v and 3v, it would also have all the power leads out the back to connect all the gpu’s on the rig,
Upon testing the psu with a multi meter I blew something, now we are trying to find out what is wrong with it,
However, if I could still connect 12v somewhere so to use the psu as I intended, without fixing the 240v area/problem, that would be ideal,
Hope that explains everything,
DODGYDAVE thermistor is back in and there’s still nothing between live and neutral,
Thanks,
Phil.

 

Hi again,
I’ve just done a few tests on what I think are called mosfets, there is a row of them as in the pic,
The red box is the one that tested bad,

This one tested bad

Just to clarify, i tested it by putting the multi meter leads on, red to middle and black to the right one then the left one, on both there is continuity, so it is shorted open on both, is that right and would it cause the mains to trip out,
Thanks for being patient,
Phil.

 

What is shorted open?

A shorted connection means that there is continuity between both nodes, with zero resistance.

An open connection means there is no connectivity between the nodes, with an infinite resistance.

From your description, I’d guess that you mean it’s shorted. But can’t be sure.

MOSFETs should be tested on the diode range of the multimeter, lest the testing process destroys them. Here is an article on testing MOSFETs.

 

Wow djfantasi,
You were there last time I needed help with coding, which by the way works spot on, thank you,
This one tested completely different to the rest on diode mode, there was a continued bleep with the red lead on the middle node and the black lead on the right node, also continued bleep with red on middle node and black on the left node,
Looking at the link I have completed all the tests, the drain goes to the gate and source,
I’ll get another one tomorrow, hopefully nothing else has gone like it says in the link,
I’ll let you guys know tomorrow when it’s fitted,
Thank you all again,
Phil.

 

I’m in the uk, and yes it’s tripping at the mains breaker,
How does it happen that is blows something using a multi meter checking for volts?
I’ll put it back in and retest,
Thanks very much,
Phil.

So it's taking too much current at switch on, you must have blown the mosfets on the start up oscillator, or the bridge rectifier is faulty, can you check the rectifier on diode test and the fets on the heatsink,,