Missing gray objects

[Turbo-Torch]

Odd issue.  My O2 boots up to a gray background and all black background games play in gray.

 

If I play UFO, any gray colored UFOs are invisible.  If I jump pins 11 and 12 on IC4, I get normal black backgrounds, but light gray object like UFOs are still invisible.  All other colors seem fine.

I swapped out IC4 74LS00N with one I had on hand and it didn't make a difference.

 

Should I suspect anything other than the 8244 GPU at this point?  And if that is the cause, are they unobtainium?  I assume the 8245 is PAL (not that it would be any easier to find).

 

[Turbo-Torch]

Update for anyone that runs into a similar problem...

 

I picked up another Odyssey 2 at a local video game store for $34 and it works fine.  I removed the 8244 GPU from my old O2 and put it in the new working unit and the problem followed it.  Definitely a partially failed GPU.

 

Anyone have a working 8244 kicking around that they'd let go for a reasonable price?

[mtshark7]

I might have one? What does the chip look like/where is it located? Pics?

Sent from my SM-G986U1 using Tapatalk

[Turbo-Torch]

4 hours ago, mtshark7 said:

I might have one? What does the chip look like/where is it located? Pics?

Sent from my SM-G986U1 using Tapatalk
 

 

Thanks for the offer, but I managed to find a spare GPU on eBay and that O2 is now working perfect again.