Buying a shorted mxm GPU : worth the risk ?

[JadeRover]

Hi guys,

 

So I found a guy in France, were I live, selling a quadro p4000 mxm card (I think a Dell one but not sure). He is selling it for parts and says he is not sure what the issue is as he used it on his desktop with a riser and it suddenly made his PC refuse to power on. He wants 45 euros for it but I'm pretty sure I can get it down to like 35/40 euros. 

 

The idea is that I buy it, and attempt to repair it to try to put it in my precision m6700.

 

I know a good bit about laptop motherboard repairs, I have already bought dead motherboards in hopes of fixing them, and I have already witnessed an i7-4700hq surviving a high side mosfet short. I also have access to good quality tools : a good hot air gun + microscope.

 

I am assuming that there is a short on this quadro, either a capacitor or a mosfet (seing as his pc refuses to power on at all). I have read up of people just replacing mosfets on mxm cards, especially 980m's and that they started working again no problem even though the GPU die was exposed to 19v. 

 

So for people who have attempted to repair mxm cards : in your opinion is it worth the risk, what is the average sucess rate ? What components give out more often? Vram, Dies, VRM, Capacitors ?

 

Also just thinking of it now, if it's a mosfet short, since the guy was using it in a desktop it was 12v and not 19v meaning higher chance that the gpu die survied ?

 

Anyways, hope someone has info on repairing these mxm GPUs.

Thanks

[GuitarG]

It is exactly like you think! I think price is okay, you will end learning few things on way. I bought GTX980 with visibly overheated PCB where damaged mosfet was, it also was shorted and turned  overcurrent protection on PSU. I regret not taking second one - guy sold 2 of them. I got it for 10 $.
I also added 3 more mosfet and caps, so it would not be damaged in same way.

It is always a gamble, sometimes core, vram or buck converter may be damaged. Remember to trust your logic more than multimeter - Quadro P5200 I bought had whooping 0,1 ohm resistance on VCORE ! It worked no problem for years and now somebody else uses it (reference- working silicon I tested always had at least 2 ohms when tested).

From GPU die point of view there is no difference if it was 12V or 20V - any overvoltage is going to kill it succesfully. So don't count on common sense in electronics repair 🙂

 

[loopster]

@GuitarG Are you still rocking that RTX 5000 in your 8570w btw? Impressive mod. I could only ever muster an overclocked M1000M in that machine 😁

[runix18]

3 hours ago, JadeRover said:

Hi guys,

 

So I found a guy in France, were I live, selling a quadro p4000 mxm card (I think a Dell one but not sure). He is selling it for parts and says he is not sure what the issue is as he used it on his desktop with a riser and it suddenly made his PC refuse to power on. He wants 45 euros for it but I'm pretty sure I can get it down to like 35/40 euros. 

 

The idea is that I buy it, and attempt to repair it to try to put it in my precision m6700.

 

I know a good bit about laptop motherboard repairs, I have already bought dead motherboards in hopes of fixing them, and I have already witnessed an i7-4700hq surviving a high side mosfet short. I also have access to good quality tools : a good hot air gun + microscope.

 

I am assuming that there is a short on this quadro, either a capacitor or a mosfet (seing as his pc refuses to power on at all). I have read up of people just replacing mosfets on mxm cards, especially 980m's and that they started working again no problem even though the GPU die was exposed to 19v. 

 

So for people who have attempted to repair mxm cards : in your opinion is it worth the risk, what is the average sucess rate ? What components give out more often? Vram, Dies, VRM, Capacitors ?

 

Also just thinking of it now, if it's a mosfet short, since the guy was using it in a desktop it was 12v and not 19v meaning higher chance that the gpu die survied ?

 

Anyways, hope someone has info on repairing these mxm GPUs.

Thanks

For that price, it could be a good buy.

[GuitarG]

Just now, loopster said:

@GuitarG Are you still rocking that RTX 5000 in your 8570w btw? Impressive mod. I could only ever muster an overclocked M1000M in that machine 😁

Sure, I do! I made custom CAD heatsink already, but I have big design choices right now. I am deciding if I would want to use vapor chamber in my 8570w.

I'm looking for other RTX GPU for my P750ZM, too 😄