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Funny enough this is why I also think batteries should be soldered. :)

I already elaborated on this in my former/ last post in reply to Daniel.
It?s doable to make it good an reliable.

I know that my chances of success are much lower on a digital synth like the TX802 because of the proprietary IC's and because I don't have a logic analyzer.

^^^^
THIS !

You?d need the right tools to move on,- but often and for a private uswer, the right tools are way too expensive.
My humble repair shop is limited in this department too,- so I wouldn?t be much help even you were livin? i the neighborhood.

With an analog synth I can chase the control voltages using a single oscilloscope probe but in a digital synth the "control voltages" are byte streams and for that you need a logic analyzer.

I ran into the same issue w/ 1 of my AKAI S-1100.
It loads samples and programs, you can operate it, see cursor moving in display, change parameters by pressing buttons and using the rotatry pot, RAM works, converters work,- but no sound except a very low level click in headphones when it receives a MIDI note.
the clock seems to be o.k. too ...
We also work w/ an oscilloscope,- but no chance to analyze the control signals.
We might come back to it again,- but some time again, we gave up, last but not least because we got the impression the issue must have to do w/ these big 1xx contact/legs proprietary chips we weren?t able to solder out and in anyway.
I own a heat gun for soldering too, but it?s not the best as also not for professional repair shops working all day,- and you need a lot of accessories for when you want to solder such parts and all the SMD types too.
I?m a musician and it?s simply uneconomic to buy all of these toys.

... because I enjoy the fault finding.

I think big in that department too,- I always did.
OTOH, I?ll retire soon,- old eyes make problems reading blurry schematics and service manuals,- same w/ music notation and even wearing glasses.

Cheers, Jacob

ditto

PeWe