Need help identifying this part

[stj]

Re: Need help identifying this part

ohms setting,
either side of the board - whatever is easier to get the probes on.

[buchman]

Re: Need help identifying this part

there are 3 possible combinations to check.
pins 1-2
pins 1-3
pins 2-3

Where do I find these pins?

[Khron]

Re: Need help identifying this part

By "pins", we understand "the (three) legs of the transistor".

[buchman]

Re: Need help identifying this part







I ordered a new transistor on Ebay.
Thanks any way guys... I blew it up-literally.
Came today from work impatiently to solder the last component (800ma pico fuse that I bought), soldered the fuse, connected to the wall socket and it almost exploded in my hands. The fuse exploded like a fireworks...
well, what can I say... newbe. We all need to learn somehow.

[buchman]

Re: Need help identifying this part

and more photos

[stj]

Re: Need help identifying this part

hmmm - the fuse should have blown first!
where did you get the picofuse and can you check it now with a meter?

[buchman]

Re: Need help identifying this part

There is nothing left of the Pico fuse. He exploded right away. I bought it in a reliable store.

[stj]

Re: Need help identifying this part

picofuse should not explode.
anyway - obviously something is shorted - probably the rectifier or fet.

didnt you check them?

[Sparkey55]

Re: Need help identifying this part

I ordered a new transistor on Ebay.
Thanks any way guys... I blew it up-literally.
Came today from work impatiently to solder the last component (800ma pico fuse that I bought), soldered the fuse, connected to the wall socket and it almost exploded in my hands. The fuse exploded like a fireworks...
well, what can I say... newbe. We all need to learn somehow.

You need to find you another hobby besides trying to fix electronics otherwise you just might burn your house down.

[buchman]

Re: Need help identifying this part

You need to find you another hobby besides trying to fix electronics otherwise you just might burn your house down.

I have an insurance.

[buchman]

Re: Need help identifying this part

picofuse should not explode.
anyway - obviously something is shorted - probably the rectifier or fet.

didnt you check them?

It was a new fet.
How do I check the rectifier?

[budm]

Re: Need help identifying this part

Are you sure it is 800mA fuse not 8A fuse?

[buchman]

Re: Need help identifying this part

Absolutely. I believe 8A fuse will be much larger.

I am wondering if it supposed to be a fuse in the first place. Maybe it was a diode? I mean the original one.

[budm]

Re: Need help identifying this part

Absolutely. I believe 8A fuse will be much larger.

I am wondering if it supposed to be a fuse in the first place. Maybe it was a diode? I mean the original one.

Pico fuse 8A will be the same size. The board already has the bridge rectifier, so no it is the Diode.
What the P/N of the old and the new MOSFET you replaced?

[budm]

Re: Need help identifying this part

BTW, did you also check the transistor Q2?

[buchman]

Re: Need help identifying this part

Hi budm,

The new mosfet P/N is
AUK
P50723
STK 0460

unfortunately I threw away the old mosfet but I do remember that it was a STK0460.

No, I didn't check the Q2.

[stj]

Re: Need help identifying this part

check across the main capacitor
it's very rare, but they can short out.

[redwire]

Re: Need help identifying this part

EEK!
Any fuse with decent UL/CSA safety approvals will not spitzensparks. I've never seen a blue Picofuse, only green.
Dirty flux/solder bridge on the PCB (ahead of the fuse) that's my guess what happened. The melted trace takes more than 8A to melt!

When the original parts went bad and you put in the wrong mosfet, I think more components are damaged like Q2 and the bridge rectifier. Did you replace R11 (0.47R 2W) it looks new?

From now on, I would power it up with a 25-40W light bulb in series, if you are confident in your electronics skills, because it is dangerous to have all that loose mains wiring. At least it will stop the Tesla Coil action.

[budm]

Re: Need help identifying this part

I sure like to see the spare fuse that he bought, I doubt that 0.8A will blow up like that. If the PICO fuse blew up that bad, the original glass body fuse would have blown up spectacularly.

[Sparkey55]

Re: Need help identifying this part

The only thing that board is good for now is to practice desoldering skills on. Not worth trying to fix.