No improvement after cleaning the corrosion off the board
Problem found?Checked the resistance from probe tip to it's PCB solder joint: black seems okay, red is in the megaohms. Could this be it? Replace the red lead with some other wire lying around...
Put the necessary bits back together, and... bingo! Got you.
Replacing the probesNote to self... check whether the tips are screwed in before freeing them with a soldering iron.
(You can see the heat damage on the red probe below haha)
I thought it would've been the solder joint coming loose between the wire and tip, but surprisingly, it appears that it's the wires themselves.
The red wire appears as if it's (literally) hanging on by a thread. The black at 6 ohms isn't fairing much better to be honest... best to replace them both. A bit tricky to find the right gauge of wire to fit through the probe body, but our donor today is cable from a set of old crappy PC speakers!
Alright, everything cut to length and soldered back together (mostly).
Everything fits back into the box nicely and yay it works!
(Side note: the continuity buzzer on this thing is amazing - absolutely instant with latched tone!)
Finally!A beautiful little pocket multimeter, 100% working and now with white probe leads! (I'm actually quite liking the white, it's growing on me)