Corsair HX850w blown internal fuse?

[mikay786]

Got a corsair HX850w PSu that has a blown internal ceramic fuse

Tested it by just doing a continuity test out of board and its dead.

E.T12AH250V Pigtail (soldered to board) Anyone know where I can source in UK?

Also given it has blown is just a case of replacing it or perhaps a sign of other issues?

[stj]

Re: Corsair HX850w blown internal fuse?

you need to fix what killed it first.
start by checking the rectifier & fets.

[mikay786]

Re: Corsair HX850w blown internal fuse?

Can they be checked inboard?

[Bungz]

Re: Corsair HX850w blown internal fuse?

These things have a 7 year warranty, prob not now you have messed with it mind lol

[ep9es]

Re: Corsair HX850w blown internal fuse?

Well, I'm stupid
I was using in the multimeter the continuity scale(200R) but not the diode scale (2KR).

I desoldered the rectifier.

If the pins are like this - ac1 ac2 + , and the multimeter cables are Red(R) and Black(B), the measures are:
-(R) ac1(B) 0.55
-(R) ac2(B) 0.55
-(R) +(B) 1.241

+(B) ac2(R) 0.544
+(B) ac1(R) 0.544
+(R) -(B) infinite

ac1(R) ac2(B) infinite
ac1(B) ac2(R) infinite

Other combinations, also infinite.

Then, Is it ok??

I will wait your answer to solder it again into the board.

Thanks

You can try to check bridge rectifier soldered to the board.

If wrong measures, then check it unsoldered.



.

[mikay786]

Re: Corsair HX850w blown internal fuse?

These things have a 7 year warranty, prob not now you have messed with it mind lol

2nd hand, bought a faulty PC and seller said PSU was dead.

Weighed up the risks and took a chance as it has some decent parts in it, and given its a Corsair HX unit which are quality, there was a good chance it would have protected the other components when dying.

Might as well tinker with it, learn and if it gets fixed great if not no loss.

[budm]

Re: Corsair HX850w blown internal fuse?

What is resistance between the two outer pads (no bridge rectifier in place) where the bridge was soldered to? Same question for the two inner pads.

[mikay786]

Re: Corsair HX850w blown internal fuse?

http://uk.mouser.com/Circuit-Protect...c+fuse&FS=True

is that the correct type of fuse? E.T12AH250V is what it says on the current fuse

[stj]

Re: Corsair HX850w blown internal fuse?

that's a match.

not good having 12A in a 6.3mm package though, they are only designed to go upto 6.3 originally.

[mikay786]

Re: Corsair HX850w blown internal fuse?

Could you link me somewhere I can actually buy, struggling to find anywhere in stock.

Went to maplins and they only had 10a, cant see any on farnells either.

[stj]

Re: Corsair HX850w blown internal fuse?

i have not seen anywhere in the u.k. that sells 20mm fuses with wires on them - i looked a while back for some 6.3a ones for dell psu's

try ebay - the chinese probably have them.

[mikay786]

Re: Corsair HX850w blown internal fuse?

Would using a 10a be suitable?

[Per Hansson]

Re: Corsair HX850w blown internal fuse?

No Problem, you are in the UK so have 230v, the big rating of the fuse is only needed if you feed it 110v...

[stj]

Re: Corsair HX850w blown internal fuse?

does maplin sell 20mm ceramic fuses with wires on them???

[mikay786]

Re: Corsair HX850w blown internal fuse?

No, they are useless. They didn't even know they exist.

I've just thought sod it and order 5 off eBay US for £15 delivered. Nothing in stock in the U.K. with reasonable postage. Even the 10a were hard to find. Mouser had them but wanted £12 shipping for the privilege.

So I'll have a few spare if anyone in the U.K. needs some.

[stj]

Re: Corsair HX850w blown internal fuse?

well at that price, dont go fitting them till you find what made the original blow!

[mariushm]

Re: Corsair HX850w blown internal fuse?

Make sure you get a TIME DELAY fuse.

The original fuse is 250v, 12A time delay. ATX power supplies can pull up to 30-40A for a few ms when they're plugged into the mains socket, so a regular fuse may blow.

As you are on 230v, the current used regularly is smaller, so you'll probably be fine with a fuse rated for less current, worst that could happen would be fuse blowing up.

Still, you should check the circuit before installing a new fuse.

See cpc.farnell.com , they may have something, even if not with premade leads, you could bodge something there.

[mikay786]

Re: Corsair HX850w blown internal fuse?

http://www.ebay.co.uk/itm/5x-T12A-25...item258978939c

Ordered these

[stj]

Re: Corsair HX850w blown internal fuse?

soldering wires to 20mm fuses usually wont work btw, the heat makes the air/gas in the fuse expand and blow the cap off the end!
you can guess how i found out!

[Ricardo Q]

Re: Corsair HX850w blown internal fuse?

http://www.ebay.co.uk/itm/5x-T12A-25...item258978939c

Ordered these

So what happened Mikey? Did it work ok?

Have the exact same issue with a CX750