To be more precise, what was your highest ratio of repair ease to value of equipment?
This was mine, a few days ago.
I was given a very cute, modern, small LCD projector, a DELL M900HD. It had been thrown out by a large institution due to being 'faulty'. It powers up, then after a few moments says "fan fail" then "over-temp, shutting down". Which it does.
On opening it up, this is what I found. There are several fans. They are not even screwed in, just slid into slots, with foam tape to prevent vibration noise. With the cover off they can be simply lifted out.
The two largest fans (still tiny) have rotor shafts that are only held in the sleeve bearings by quite weak plastic clips on the shaft end-ring. Mostly they are held in place by the field magnets.
Someone had bumped the projector sharply enough to dislodge one of the fan rotors. It had slid out of the sleeve bearing and wedged.
I just popped it back in, and screwed the case lid back on. Four screws. That was it. This is a really nice projector, very small, with lots of inputs, and even WiFi video input. Also the lamp is LEDs, so no short-lifetime HID lamp to fail.
In the pic showing it running I have the brightness turned down to the very lowest setting.