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Optoisolator ? To be honest, the CRT swap was not relevant, unless they are broken, they cannot give this kind of problem. The issue with voltages going all other the place are usually related to the Optoisolator, there is no way to troubleshoot this item, but the part is cheap ans socketed.

I think you are ok with those, but probably using schematics to confirm will be the best choice.

Original capacitors for sure, and lot of juice everywhere

I have not found any evidence anywhere, but i can think about serial numbers as the following : first generation M5010 were twin 800k drives or single drive without any hard drives or supplied with the external 20SC hard drives. then the M5011 with internal hard drive and 800k drive, the new...

I have seen another SE for sale, the main rear label says 800k drive, 1 Mb and 20sc hard drive, while the small sticker has a M5011 serial number. Front is just the usual SE label. Don’t know what to think about it, maybe at some point all were 5011, with or without the new drive and Roms ?

Yes, just remove the 800k and fit a 1.4Mb, will work. I have done it with a manual inject also, still have it, a bit tricky to get a disk in, but works and ejects just fine

remove and replace the RIFA as soon as possible.

Concerning cable, this is an easy fix, as a phone cable with a small modification will fit.

Nice, the 400k drive will probably need some elbow grease before working again

Also, concerning sound, broken trace somewhere Looking at the video, the image is stretched up too much… so either a voltage issue, or a potentiometer to be properly set to achieve the correct dimension.

Never seen this issue, but you still can have an issue with the Analog Board, what voltages have you got at the Molex (HD connector) Seems like the 12 volt is ok but the 5 volt is not in the first place.

IIRC I used an ISO file

will be better in the Trading post thread section

USB stick didn't worked for me, had to use an external HD

Not a 100% but IIRC there is a bunch of LED for troubleshooting purposes in the Logic Board

really cool

Caps first...

Well, to be honest, if you just look at the label and serial number, you should have a FDHD unit. But the serial is just a sticker in the rear case, so, probably the rear bucket was swapped at some point. All new models (M5011) were sold under the FDHD or Superdrive name, both having it...

I agree, they are always bad

Can you try monitoring voltages ? You should know what you are dealing with.