CoreGrafx II troubleshooting

[daty2k1]

Hello, I'm in the process of trying to resurrect a CoreGrafx II from the dead. This one started by giving a black screen but it seemed to have power. I didn't see anything obvious so I did a full recap.

Now I am getting something but graphics are corrupted and/or missing in places. From the very few posts I could find on the web, it could be bad RAM chips.

Has anyone any experience with this ? Are there any replacement chips that we can buy somewhere or will need to canibalize another dead unit ?

Thanks

[daty2k1]

Well I replaced both ram chips and it still has glitches. Seems like I won't be able to fix it myself...

[NoAffinity]

Get a logic probe and start probing. Itll be the best $20 you ever spent.

https://www.amazon.com/dp/B000Z9HAP4/re ... EKMDQA7WKM

Sent from my SM-G955U using Tapatalk

[Gunstar]

Might be the HU C6270 chip? I had graphical issues with it on a TurboDuo and reflowing it seemed to help.

[daty2k1]

Get a logic probe and start probing. Itll be the best $20 you ever spent.

https://www.amazon.com/dp/B000Z9HAP4/re ... EKMDQA7WKM

Sent from my SM-G955U using Tapatalk

Well then I'm going to have step up my game and start studying electronics...

I did try to reflow all other ICs but not dice. I think I'm just going to sell it for parts. Hopefully someone smarter than me will figure it out.

[SavagePencil]

Any pics? Is it a particular type of graphic (e.g., only sprites are garbled) that could help isolate where to look?