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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?

Does anyone know about replacement PAL and Video ROM chips?

Thanks!

Glad I found this...what about UC8 or UD8? Looks like I might be replacing UD8. Thanks for any help.

What am I looking for on Mouser for UD8, UE8, UF8 replacement chips? Can I also buy replacement PAL chips on Mouser? These do not need to be programmed? And a chip to program as a Video ROM replacement? I'm sure I won't need all of that but since chips aren't that expensive I might as well...

once I loaded the boot disk, it is responding to key commands like "Apple Q" to quit the installer and eject the disk.

nope. Totally new to the video side of these boards. How would I do that? Thanks for your help.

I cleaned and restored the floppy drive also. I put a disk in it that I knew did not have a system and it ejected it as it should. Then I tried a system disk and it seemeed to boot, although of course I can't see the screen. reset button works also.

Do you know anyone who sells them? I wouldn't mind having a few spares.

That may be my next step. It pains/scares me to pull the chips out of a perfect board. How hard is it to find Video ROM and or PAL chips? If they are tough to replace I may just replace UD8, UE8 and UF8 and see where I'm at.

oh yeah, I didn't think of hitting the reset button. I'll do that just to confirm that it restarts and that is working.

correct yes it does chime after the recap so that did fix the sound for sure. but yeah, basically video blackout before and after the recap. I bought it pretty cheap on eBay as for repair, hoping it was something on the analog side but yeah logic board video issues are unchartered waters for...

I'm trying to understand video issues more clearly. I have an SE/30 board and it chimes and seems to boot, but there is no video output. Occasional static, but usually just completely dark. No simasimac just a blackout with occassional static (see attached video). It is my understanding that if...

Heres an overview of what (I think) I know so far... Analog board, CRT and PSU are fine. They work with other SE and SE/30 logic boards and have been recapped. No video - occasionally displays random dots, snowflakes, static...(see attached video). Then calms down and stays dark. It chimes...

newbie question.. which chip is the video PAL?

is it a good assumption that since it chimes, it is seeing the ROM and therefore the board is working, but there is an obvious video issue. In other words, the ROM, RAM And processor are alive?

well, an update… Making some progress. After a full logic board, analog board, and PSU recap, I've got sound working (it chimes). Still no video. And that problem is isolated to the logic board because this analog board and power supply work fine with other boards. The CRT is no longer making...

fantastic. This is exactly what I've been looking for. Thank you.