Hi,
I'm trying to fix a really nice looking Rev.6a motherboard (512k), no corrosion damage.

First power on, only give me yellow screen.
Taken out all chips, and give them a round with ipa and deoxide, all looks like new. Still yellow screen.
Measured all voltage, cpu got good clock, reset, and halt stays high.
Don't know the history of this board, but caps will be replaced later, un-soldered a few, and they measured good.
Inserted Diagrom 1.3, but it only give me a strange color output (attaching a short video) (don't have a serial cable yet)
I hope some of you know what this it, I cant find any documentation explaining this.
So now i'm stuck.

Please help me bring back this lovely board to life.
My guessing is that the first bank of chipram is bad, so kickstart/diagrom can't execute code, but that just a hunch.

(Chips and sockets are in the mail)
(Sorry for any bad english, norwegian is my preferred language)

Petter