Hi everyone! I signed up here because it seems to be the best place to talk about Switch hardware repairs. I decided to try my hand at fixing a switch after doing a lot of work on laptops and phones, and I'm a little stumped at the moment. Life sure is easier when there are readily available board views and schematics!
The switch I have was apparently liquid damaged and now will not boot. There was a tiny bit of corrosion on the screen ribbon cable, the power/volume button ribbon cable, and the capacitors near the MAX77621 in the lower left corner of the board. I haven't found any capacitors shorted. The switch will not connect to a PC when plugged in with a USB cable. Nothing is displayed on the screen. It will charge the battery at 5V/0.4A, and will negotiate with a usb-c charger up to 15V/0.4A. The current there doesn't seem right to me, but it does charge the battery albeit very slowly. The CPU appears to be doing something as well, as the copper plate on the shield underneath the heat pipe will get warm, but not hot, after applying power for a few minutes.
Any idea where to look? I know the M92T36 and the BQ24193 are the two charging and power related components that often fail, but I haven't seen symptoms quite like these when searching for answers. What are good test points for voltages required for operation?
Thanks in advance!
The switch I have was apparently liquid damaged and now will not boot. There was a tiny bit of corrosion on the screen ribbon cable, the power/volume button ribbon cable, and the capacitors near the MAX77621 in the lower left corner of the board. I haven't found any capacitors shorted. The switch will not connect to a PC when plugged in with a USB cable. Nothing is displayed on the screen. It will charge the battery at 5V/0.4A, and will negotiate with a usb-c charger up to 15V/0.4A. The current there doesn't seem right to me, but it does charge the battery albeit very slowly. The CPU appears to be doing something as well, as the copper plate on the shield underneath the heat pipe will get warm, but not hot, after applying power for a few minutes.
Any idea where to look? I know the M92T36 and the BQ24193 are the two charging and power related components that often fail, but I haven't seen symptoms quite like these when searching for answers. What are good test points for voltages required for operation?
Thanks in advance!
