What equipment??

[budm]

Re: What equipment??

Another key point for locating shorts is that you have the schematic to see how the signal lines or power lines are distributed.

[newtothis]

Re: What equipment??

Yeah this is the issue budm, Rarely can I ever find schematics for graphics cards... Cheers everyone else for the input too...

I may get a bench PSU and inject voltage through after putting IPA over parts of the board.... I do know that the IPA will evaporate a lot quicker with even the slightest heat change and should see the general area at least

[retiredcaps]

Re: What equipment??

I may get a bench PSU and inject voltage through after putting IPA over parts of the board....

Wait, I thought any liquid on top of powered on electronics could cause problems including shorts?

I recently received a Dell laptop that would not power on. The history was unknown and after several hours of troubleshooting, I finally narrowed down the problem to the keyboard. Some probably spilled liquid on the laptop while it was powered on and cause the keyboard to short out. Removing the keyboard allowed the laptop to power on and function correctly.

[diif]

Re: What equipment??

IPA of a decent purity isn't conductive. I've used this trick a couple of times.

[newtothis]

Re: What equipment??

Yeah IPA won't conduct. I have Gallons of it as I use it for cleaning off flux after BGA rework

[retiredcaps]

Re: What equipment??

IPA of a decent purity isn't conductive.

Hmm, I guess I'm overly cautious then and letting IPA cleaned boards dry overnight before powering them on.

However, I don't have the 91%+ IPA. I have the 70% stuff.

[newtothis]

Re: What equipment??

Hmm, I guess I'm overly cautious then and letting IPA cleaned boards dry overnight before powering them on.

However, I don't have the 91%+ IPA. I have the 70% stuff.

Mines 99.9%

Not sure what 70% would do so yeah best let it evap first

[SteveNielsen]

Re: What equipment??

70% rubbing alcohol contains lanolin so don't use that, if it's not rubbing alcohol then it's probably just 30% water and can us a hair dryer to evap the water off.

[newtothis]

Re: What equipment??

This is seriously giving me a headache... Attempted to input current into the circuit and see if IPA evaps faster... No component is heating up :S

So seems using an ESR is useless... I have no schematic... Inputting current doesn't yield any clue...

What else can i try other than tearing components off one by one?

[stj]

Re: What equipment??

what voltage is shorted?
if it's a very low one then start by lifting the gpu

[newtothis]

Re: What equipment??

I have no clue what is shorted, Just 12v rail to ground is <1 ohm.

[Behemot]

Re: What equipment??

Its some graphics I understand? Often the MOSFETs go bad, and they are pretty special ones, often impossible to get and you need reflow station to replace them. What graphics it is?

SMD is unlikely, if it blasted fuses on 150W connector, 0402/0201 SMD component would vaporize if it was shorted.

[stj]

Re: What equipment??

12v line doesnt have much on it, just some caps and fets usually.

got a good pair of front/back foto's of the card near the 12v connector?

[newtothis]

Re: What equipment??

I will have to take some.

All inputs are 12v so I am not sure after that what line the short will be on. Just know there are 2 connectors both 8 pin, One side shows no short but the other does.

[Behemot]

Re: What equipment??

What card?

[newtothis]

Re: What equipment??

Sapphire R9 290 4GB Tri-x

[newtothis]

Re: What equipment??

Its some graphics I understand? Often the MOSFETs go bad, and they are pretty special ones, often impossible to get and you need reflow station to replace them. What graphics it is?

SMD is unlikely, if it blasted fuses on 150W connector, 0402/0201 SMD component would vaporize if it was shorted.

I have IR reflow station BTW, I also have a 800x microscope and fine pitch soldering equipment. Pretty much no soldering Job I can't do.

If I can find whatever shorted then I can get a donor card and use parts

[Behemot]

Re: What equipment??

Quite possible, very high consumption card. It has those bloody special transistors, see http://images.bit-tech.net/content_i...p290xoc-7b.jpg

[newtothis]

Re: What equipment??

I will get pics soon, My card is different layout