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Just to follow up on this - there was significant damage around the SCSI chip. I tried to remove and replace, attempting to repair the pads that fell off the board during removal, then installing a new SCSI chip . but I have now been left with a machine that has horizontal black bars across the...

Save that L2 G3 upgrade card for a Twentieth Anniversary Mac! :)

Yeah. Used this truck to jump start my II power supply. Unfortunately, no startup or error chime. Going to do a recap at some point as it looks like it was done with radial caps and it looks bad. Also unsure of the quality of the caps, so restarting with fresh caps feels like a good start. No...

I guess that's my question. I've seen some documentation saying it's two 3.6v batteries (7.2v total) and others stating it is two 3v batteries, for 6v total. Anyone confirm what they are using in theirs and if it is 3v or 3.6v batteries for the two slots?

Anyone know if I used a couple 3x AAA battery holders if it would work? If it's expecting 3v, the 3.6v of the AAAs would be a bit high. Too high?

So it seems to be a problem with the logic board, as I plugged the board into my other SE/30 (known working analog board) and got the same behavior. I'll take a closer look around the SCSI chip for anything that looks out of place. I may simply save this board and use it with the SE/30...

That was useful. I checked the 5v pin on the bluepill, assuming that would carry through the voltage from the SCSI 5v line. It was less than 3v. I'll check out the pins from the analog board to see if the voltage is bad there, or if there is a problem on the analog board getting the power to...

Sorry, I should have made it clear that I can use these BlueSCSIs with their SD cards in my other SE/30 and they work properly. I wasn't trying to imply the BlueSCSI was the issue, just wondering if the solid red led on the BlueSCSI might help track down why the SCSI ports on the SE/30 aren't...

I picked up a SE/30 that had some pretty significant capacitor leak damage. I had a transistor at Q3 fall off the board from corrosion. I didn't initially see it, but I had pin rot on UE8 that lead to a jail bar pattern on the screen. I replaced Q3, and installed a brand new UE8, and the...

OK, so UE8 it was. I swapped it with a new one (https://www.digikey.com/en/products/detail/texas-instruments/SN74LS166AD/1590375) and the bars are now gone! If you are having a jail bar pattern on your SE/30, and video RAM seems to be OK, check for UE8 legs and traces. SCSI still doesn't...

Finally got the new chips in and unfortunately, the problem persists. Although it went from intermittent to permanent lines. I don't see any traces that look bad (none looked to have any damage under the video ram chips). I found another post with similar symptoms and it pointed to the UE8...

I had a board that behaved this way. It ended up being a broken pin on the edge connector of the board, so maybe inspect those. Mine had been bent back, so it wasn't making contact, and then it snapped off when I tried to bend it back. Some incredibly bad soldering with a pin I cut off...

I always thought it used the first 1MB of RAM for video? I took a closer look at UC6 and UC7. and didn't notice anything that looked unusual. Solder looked fine, legs seemed ok. Testing chip level functionality is beyond me, unfortunately. Would these be a possible replacement...

I picked up a SE/30 off FB MArketplace and in the picture it had the vertical lines and a floppy (interestingly the bars were only on the background - the floppy icon was in tact: But, it's an SE/30, so I figured its is worth trying to fix. I got it home and fortunately, the battery was...

My understanding is you want to ensure the capacitance is the same, but the voltage simply needs to be higher.

I threw in some Eneloops in the case, added some velcro and put it in my Mystic Color Classic and it seems to be working. Was reading a bit over 4v after I charged them. Settings are being kept between boots. I'll see how long it lasts.

Sorry, I should have made that more clear. Yes, we've all seen our favorite Maxwell lithium batteries leak. Typically those batteries are 20-30+ years old. However, I've had 1 year old alkaline batteries leak and start corroding things. If I can get 10 years out of a battery without worrying...

The possiblilities I can think of are: 1. You got extremely unlucky and both power supplies are non-working. 2. There is a problem with the logic board that is preventing it from sending the power on signal to the power supply. There's probably a way to short out some pins on the power...

So it was unable to power up before the recapping. Then you sent the logic board for recapping, and it still refused to start up. Then you replaced the power supply, and it still refused to power up from either the power switch or the keyboard?

Did it ever work after the recapping? Was it working before you replaced the capacitor? I'm not sure if the problem can happen on the 840, but I have a Mac Color Classic (all in one) that would refuse to boot with the keyboard (there was no soft power button on the Color Classic), but I read...