200v 220uF Main Cap Replacement Advice?

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

Are you sure, the track connects to this daughter board and the two resisters are in line with the pins?

[momaka]

Re: 200v 220uF Main Cap Replacement Advice?

It does, but those aren't the Source resistors. I am 100% sure. Too high of a resistance and the tracks leading to the daughterboard are too thin. Plus, it looks like the Source legs on both MOSFETs go directly to the transformer pins.

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

All sorted, that was probably the hardest but most satisfying repair ive done to get something working again. Pretty much everything ive learned over the last year was of use.

Just a quick question regarding heat, on my solder sucker desoldering station I set it at 360c which I thought was a good temp. But I found myself twice pulling pads whilst working on this, the PCB was a little thinner than normal but still normal.

Is that too high a heat?

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

Got hold of another one of these which had 2 blown irf730 mosfets which ive replaced.

It turns on and then off right away but doesn't blow a fuse and just makes a clicking noise coming from the main PCB.

Sound like a relay switch but for the life of me I cant see one?

Could something else be making the clicking noise?

bridge rectifier, filter caps, small transformer, 2x 104k ceramic caps, yellow thing 22k275v-x2, varistor 14n471k and a thermistor SCK104, 3 resistors all in the early stage

[stj]

Re: 200v 220uF Main Cap Replacement Advice?

or a coil energising and hiting the core.

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

from the small transformer?

[stj]

Re: 200v 220uF Main Cap Replacement Advice?

what's with the resistor right of the main caps?
and try to lift that glue!

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

That glue is a son of *****, so bloody hard to get off.

Resister a bit mangled as I was trying to get it out but had glue all over it, the outer shell broke off when removing. Tested ok.

Looks like this one is beyond repair if the transformers are gone

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

http://www.ebay.co.uk/itm/MURATA-102...cAAOSwrklVOT-i

edit: something like that possible? size is roughly the same and looks very similar

So is a AC line filter inducter, just going to remove the bigger yellow coil (assume that's a transformer!) and see if its still making clicking noise. Was just about to give up but that might be replaceable.

[stj]

Re: 200v 220uF Main Cap Replacement Advice?

i doubt there is anything wrong with them.

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

Seems it's the bigger transformer as when remove clicking stopped and when put back in it started again.

[budm]

Re: 200v 220uF Main Cap Replacement Advice?

Your board is about the same as in this thread but less glues:
https://www.badcaps.net/forum/showth...highlight=diac

[mikay786]

Re: 200v 220uF Main Cap Replacement Advice?

Yes it is, very similar