IMac internal GPU not working

[eladnova]

Hi all.
my iMac was purchased in 2013 with an NVIDIAGeForce GTX780M 4GB GDDR5
SwitchEd on today to see blue vertical lines down the screen.

Does anyone still sell these as replacement GPUs? I took the display off, checked all connections I could access.

finally, I read about extending the GPU life by baking but cannot locate a removal guide.

thanks

 

[q64ceo]

Baking a GPU works only temporarily. It's not a fix but a work-around.

I believe the GPU is soldered on the logic board for this iMac.

 

[chscag]

I read about extending the GPU life by baking but cannot locate a removal guide.

Have you checked at the ifixit site?

www.ifixit.com

 

[Nguyen Duc Hieu]

Hi all.
my iMac was purchased in 2013 with an NVIDIAGeForce GTX780M 4GB GDDR5
SwitchEd on today to see blue vertical lines down the screen.

Does anyone still sell these as replacement GPUs? I took the display off, checked all connections I could access.

finally, I read about extending the GPU life by baking but cannot locate a removal guide.

thanks

As thi GPU is soldered onto the logic board.
The baking trick is not for you. Period.
It's the job of a professional repair shop which has this kind of machine:

By the way, how can you be sure that it's the GPU that went bad?
Have you tried hooking up an external monitor to see if video signal is sent to it?
If the external monitor works, then the internal LCD is bad, not the GPU.

Watch the below video to see what maybe inside your iMac 2013.

 

[cltd]

Welcome to the club... I had iMac 2013 27, its GPU (GeForce GTX 775M) died. This iMac is unreparable; they offer whole mainboard switch but it doesn't make sense (you pay for 7 years old specs). No backing trick, no reballing - doesn't work on iMac 2013.

 

[Nguyen Duc Hieu]

Welcome to the club... I had iMac 2013 27, its GPU (GeForce GTX 775M) died. This iMac is unreparable; they offer whole mainboard switch but it doesn't make sense (you pay for 7 years old specs). No backing trick, no reballing - doesn't work on iMac 2013.

Nothing else to do, then.
If you are an environmentalist, then re-purpose it as a 2k monitor, or a hackintosh iMac is a good idea, better considering it as a fun project.
If you are more of a pragmatist, then listing it for parts is also a good idea. The LCD is still usable for guys who incidentaly broke the LCD on their iMac.

 

[eladnova]

Hey all
Thanks for all the replies and suggestions. I will find some way to recycle this or sell parts etc.