Matrix-hd7970-3gd5 death

[manotari]

Hello, I have a VGA to put it on the PC, leaving it dead, will not start.

I've found that I had a capacitor backwards, I placed well but still the same. Now I'm looking for a new capacitor to discard.

Could have charged more?

This is the photo of the capacitor appears backwards.




Thanks

[DJduck]

Re: Matrix-hd7970-3gd5 death

It APPEARS backwards, but is it really? Check for markings on the board. And if it really was backwards, then somehting might be blown. Also, it might be a gpu issue. Those caps are polymers and probably al good, because the dont go bad very easily

[Uranium-235]

Re: Matrix-hd7970-3gd5 death

its an asus board, motherboard or vga board, they mark everything on the positive side, so yes, it is backwards

its actually a Functional Polymer, which stands a higher chance of dying than a full blown polymer in the case of a umm well just call it 'reverse polarity incident', actually I see a slight shadowing on the top which means it might have a slight bloat. Solids don't usually bloat they usually pop, but this is an FP and some of that pressure might of been released through the bottom

its hard to tell what series it is, cause of the convoluted way nichicon marks the FP-CAP series, but its 270uf 16v, thats about all I can tell you

[selldoor]

Re: Matrix-hd7970-3gd5 death

I have been looking for a fuse but cant see one. However i notice that you have an excess of thermal paste -(use a rice grain size blob only) - anyway it is on several of the components and unless it is totally non conductive (electrical) it will be shorting them out.
Clean off with Isopropyl alcohol.

[rogfanther]

Re: Matrix-hd7970-3gd5 death

Also, what is the history of the board ? Was it recapped, stopped working, what else ?

[tmiha71]

Re: Matrix-hd7970-3gd5 death

i notice that you have an excess of thermal paste -(use a rice grain size blob only) -

Even less will do the job, half or even a quarter (of size of rice grain) will be enough (at lest did job on CPU's)...

[mariushm]

Re: Matrix-hd7970-3gd5 death

PCE101 is soldered incorrectly. Look at all the other capacitors, that PCE101 is the only one backwards.
After desoldering it, make sure it's not shorted before soldering it the right way. But you should just replace it with a new polymer capacitor instead.

Get some isopropyl alcohol and remove the excess paste that touches those resistor networks near the gpu chip.

Otherwise, there's nothing obviously broken on the card. Measure voltages on the capacitors when board runs and go from there.