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Well it's clean(er) and I have a bodge wire to UC6 pin3 (Vid5) in my future.

yep. Will do.

Definitely found some serious crud under UE8.

Thanks for the info. Yeah it appears to boot fine...just the video issue of course.

I double checked every pin on UD8, UE8, UF8 and UG8... they all check out with no broken traces to destinations. My next step is to replace UE8 and possibly other U*8 chips. Replacements should be here tomorrow.

Thanks! I've double checked every pin on UE8 to destinations and there are no continuity issues.

also, would this imply that the PAL chips and video ROM are not part of the problem and it is isolated to the U*8 chips and related traces?

Thanks. I've checked all of the pins to ground, +5 and PAL chips. All of those are good. The pins that are Vid(*) are not clear to me. I'm new to schematics so I'm not sure where those ones are going. It looks like they are all connected on the schematic but with small circles?

And a still picture.

Here's a short video of the weirdness I get when I connect pin 13 to 12 on UE8... otherwise the screen is black.

When I connected UE8 pin13 to the neighboring pins 12 or 14, the screen lit up, but it was a mess...I could roughly make out what would be a flashing disk icon and cursor though..and I could move the cursor. I'll upload a picture when I get home.

yeah, I will post a picture tonight thanks but I do recall either vertical or horizontal jail bars

Finally got a logic board connector extension, so I was able to play around with UE8 live... upon testing some of the voltages with a multimeter, the video came to life when I accidentally touched pin 13 to 12 (or14)..... although it was garbled, I could make out the flashing disk icon...and the...

I found something suspicious in my ROM socket (see photo). the board chimes and boots fine but I get no video at all - total blackout. I've been going through potential issues in the video circuit. Is it possible that this is the cause?

got it. Thanks again for your help. I enjoy your channel also!

I didnt realize it but UF8 and UG8 are 14 pin chips but the rest are 16 pin chips. Are we certain that A-E are the same?

All of my pins on UE8 have continuity to where they should go..PAL , +5 , ground

Thanks! I've cleaned all the black and green I can find on the board. Check continuity on all vias near all the U*8 chips and that's fine. I realize there are still traces I need to check but my big question is: Is there anything on the logic board that would cause a chiming/booting board to...

Thanks!

thanks. Where would I find these files? Is there one for the video ROM as well?