A month ago I received an OLED Switch that was in a house fire. I was able to get it working after cleaning out the corrosion and replacing the battery. Switch works fine and haven’t had any issues other than it not being able to read micro SD cards. There isn’t a lot of documentation on OLED repairs so I’m kind of going at this blind. So the OLED switch uses a daughterboard for the SD card and game cart reader.
Oddly enough, it reads game carts fine so the daughterboard gets some form of power. Perhaps the biggest hint as to what’s causing the fault is that the cap under the SD card reader (I THINK) needs 3v3 to read cards but what’s happening is when I turn the console on, 3v is present at the first Nintendo logo, then disappears once the 2nd logo and OS is fully loaded.
I’ve replaced the SD card slot itself as well as the caps under the SD slot (I assume the caps under the switch lite SD card slot are suitable replacements). The PMIC outputs 3v3 so I’m thinking there’s some sort of component between the PMIC and daughterboard that feeds the 3v3 to it, and the corrosion has caused it to go faulty.
Updates:
The headphone jack also works fine.
The “unable to access microsd card” error comes up even without a micro SD card inserted.
The error doesn’t come up at all when the daughter board is disconnected from the motherboard.
I believe this resistor connect to CMD and since it reads a diode value of 274 on the left pad and 588 on the right pad, would this imply that the CMD line itself is faulty?
Gotcha ok. So since all the other pads have a normal diode reading, its probably safe to assume that the connectors are fine? Physically they both look fine. So I suppose I should give an APU reflow a try?
I would make sure MB side CMD line corresponded pad having continuity all the way to sd-reader pad first.
Most time “looks good from eye” got tricked easily
No worries. So I soldered a wire to the CMD pad on the daughterboard, wrapped it around one of the probes then started probing the male connector. There was no continuity between the pads at all. Would these mean faulty daughterboard?
Likely, if device been water damage around daughterboard, CMD line maybe on through whole trace and got corroded inbetween. Do you have hi-res front and back shot of daughter board?
Went ahead and soldered a jumper and the pad now has a diode reading of 617. Now I’m just trying to figure out why the voltage drops from 3.3 to 0 on the cap under the sd slot.
