820-3332-A GPU N13P-GT-W-A2 alternative?

[macfix]

I m working Mid 2012 retina 15" 820-3332-A with random freeze problem when using who application need more GPU power. ASD report GPU problem but you know apple no more replacing boards.
Replaced 2 times GPU with new one but now when loading OS freezing and EFI ASD not report error ( Chines seller say new but i cant be sure DataCode is 1240 ) last month same problem solved by replace GPU from donor board and working without problem.

So do you have any idea witch chip can be use alternative for this board or you can share known good chip?

Thanks

 

[dukefawks]

Really? Really? U8900?

 

[roy.ruan]

Im not sure if it is really the problem of the quality of the chipsets. I got few boards in this condition,replaced GPUs all have no luck

 

[macfix]

Yes dukefawks resoldered first and replaced second time U8900 before touch GPU

Its too interesting nobody write any where about this chip replaced worked or didn't work at forums

 

[ALB-Repairs]

Hi
I had a 820-3332 that had no boot issue,
Even after doing the U8900 it was the same, I replaced the GPU and it is now fully working.
If its not working i would try a v-ram reflow or something, Doing GPU's on these boards is tricky and its much the same as the 2915's with the vram being effected by the heat of the rework.

 

[macfix]

thank you ALB-Repairs i think you should be right because around v-ram guile is strong and cant be clean easy... I ll replace all from donors .

 

[ALB-Repairs]

thank you ALB-Repairs i think you should be right because around v-ram guile is strong and cant be clean easy... I ll replace all from donors .

Yes, the only way i got mine done easily was because it apple put weak glue on mine. it was a previously recalled board. i will be interested to see if it fixes your issues.

 

[dukefawks]

Just replace VRAM and GPU all at the same time. Any N13P-GT chip should work.