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I’m thinking that the RJ-11 jack could be removed entirely and a blanking plate could be 3d printed for the port

I figured, I forgot how much voltage phone lines carry  :p

Considering that the board was already recapped it is possible that the previous owner did not install the caps correctly and caused this issue,  check the polarity of all the caps and their values. Considering how cheap capacitors are it might be worth getting a new set and recapping it yourself.

I’m guessing that the RJ-11 jack would be unusable after this modification? 

As someone who used to own a duo, and is about to purchase one again this is very exciting 

You really want to recap this machine, especially the screen as electrolyte can leak and permanently damage the LCD

I might have a power adapter you can have, I’ll look for it tonight if you want it

If you have already recapped the machine try cleaning the board again as sometimes cap goo can get underneath chips and components 

+1  I would also like to source a pair 

No problem!

Does the USB cable look like this? this is a data transfer cable for a graphing calculator

You can use some superglue, I use this to cover traces as it can be easily dissolved by acetone if you ever need to get to the trace, plus it dries fairly quickly

I had to buy a new switch and socket for the PSU does anyone have a picture of the wiring?

Thanks that’s perfect!

I am trying to recap a Dynacomp PSU, specifically model DCF 353-614-0028 and I’m having trouble figuring out what capacitors are used in position C28 and C9, I was stupid and lost/misplaced the original caps so I have no clue as to what rating/voltage of capacitor is supposed to be in those spots.

I just bought a pair of these https://www.amazon.com/Synergy-Digital-Combo-Pack-Compatible-Dogwatch/dp/B06XQ7V7R2/ref=mp_s_a_1_4?dchild=1&keywords=3.6+volt+lithium+battery&qid=1604150589&sr=8-4   Really anything with 3.6v will work, if you are handy then you could rig up your own...

No problem!

I’m still trying to get a hold of a mAcTX adapter so I can replace the original PSU, maybe that will solve the problem 

Ah okay, thought it would be really neat to see a portable apple II (even if it’s technically not an apple II) 

Mine has no Reset button but there are solder pads for one