I hope someone can assist, i have a shabby 130xe that is reliable but it has no sound out of the monitor socket (just thought: i will have to try the RF modulator..)
anyhoo, heres what ive done so far:
desoldered pokey - it works fine in my 600xl
desoldered LM358 (U1) - also works fine in my 600xl.
metered up all the associated resistors (as specified in sams computerfacts) - R3 showed no reading. great! - or so i thought. i replaced it but sadly no change...
desoldered 2x elect