I figured this would include home electronics/appliance type fixes, so I've got a recent one
We have a nice, high end (cherry metallic red!) LG washer/dryer set, about 7 years old, out of extended warranty. Last Thursday, out of the blue the front display goes dark, so I immediately check the breaker panel, nothing is tripped, not to mention when I open the door, the interior light comes on.
OK, so we pull it out from the wall so I can reach the rear top screws, I confirm some disassembly online, simple to remove the rear bracket, top, access the front panel logic board. I remove it, inspect it for damage. specifically the caps, looks OK, smells a little funky (DC converter looks a little black), board level repair would be a PITA as it's sealed in a thick layer of epoxy (I guess for heat and/or moisture resistance).
However, you don't need full on board level diags on something like this, there's really 4-5 major systems in a dryer, ID and replace.
So dryers have a couple of sensors, one is the thermostat, if that goes, everything else should work, just no heat, clearly this wasn't the case.
A second sensor located right near the thermostat is a thermal fuse, this is a safety switch in case it overheats (due to outlets being blocked/clogged, etc.) FYI, for the aforementioned sensor access if you research via YT, recommends removing the front, the drum/belt: *however*, on our model (and apparently most models), you can reach them through the rear duct cutout, and that's way less disassembly! FYI#2, you can reset them, even though they might be spec'ed as "single use".
So I take out the thermal fuse, to check it with a meter, then I thought to check the front door light, it still works. So I'm thinking if the fuse was some kind of global shutdown, there wouldn't be power to anything, and on top of that, cutting display power seems like an odd behavior, I re-install it, go back to the logic board.
So the board assembly is really two components, the rear board with most of the components, including power, and a daughter board with the switches and LEDs that connect to the external facing front panel. I decide if it is something, it's 95% likely the main component, and it's easy separated (two connectors, 3 screws).
I hop onto Appliance Part Pros who I've used in the past, find the part (they have a terrific search system, that also shows related components). I read a few comments, a few seem to suggest I'm on the right path, so I place my order, $98, the cheaper shipping puts it around 5-6 days, I pay just an extra $12, for next day delivery (and this was at 3p in the afternoon).
Get it around 1p the next day, pop it in, we have sounds and lights! Take some time to clean out a few things while it's away from the wall and I have partial interior access, put it back together, done. Resolved in under 24 hours, no service call, reasonably low cost fix (I would've saved another $30 if I wanted to wait for delivery from a slower source). It's been running for a week and a few days, perfect.