Hi Alex,
I've had a slightly similar issue with my LXD75. A few years after purchase the motors clapped out (probably the circuitry more likely). Long story short I purchased a Skywatcher EQ5 dual axis drive kit (no goto) for just under $250 AUD at the time from 365Astronomy. You're probably looking for a cheaper fix but this is a viable option to consider. I used it for the first time last month on Fraser Is with guiding for widefield; worked well.
If you're interested I have the LXD75 motor units and the directional controller/paddle sitting a box taking up space. The motor units I wouldn't trust (no/uncontrollable slewing at times) but the paddle should be ok. PM me if you'd like me to send any/all of it your way.
Cheers
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