Switch with water damage noch longer starting, 1V3 Rail missing at Max77620

Nintendo Questions Nintendo Switch
1

Hey guys,

I have a Mariko switch in front of me that has a lot of water damage (maximum in the area of the Max77620).

After cleaning with isopropanol + inspection with a microscope, I noticed that the background flat cable is damaged (but can be fixed with a repair pad). The LCD connector had a bent pin, but I was able to straighten it under the microscope.

USB port is adequate after testing with the help of a breakout board.
The switch also charges the battery when connected to the power supply.

However, when measuring the Max77620, I noticed that the 1.3V rail is not present, the 1.0 rail is at approx. 0.8V, the rest looks ok.

When I connect the switch to the lab power supply with 4.2V via VBAT, it draws 0.046A.

Since I didn’t get any further with the information from Retrosix, I wanted to ask here if anyone else has any ideas.

Thank you very much.

2

I have an OLED with the same symptoms. I’m measuring 10 ohm from the 1.0V output to ground, and it sits at 0.85V when powered on. I’m assuming voltage is being pulled down by this partial short.

I’m also missing the 1.3V rail but perhaps it doesnt get far enough into the boot sequence to bring this one up yet.

Did you resolve your issue?