Hardware 0.45A, No boot - Backlight stays on

[Mightyjebus]

I had another Switch fault today that I haven't seen before and thought I'd share.

Switch in question came to me after someone else had worked on it. It looked like someone had replaced the USB-C port at some point and had left a load of flux residue on the motherboard.

Symptoms were 0.45A on the Nintendo Charger, The switch would try to boot with the backlight coming on but nothing on the LCD. The backlight would stay on and there was no sound when trying the touch.

I took the motherboard out the case, cleaned it up and tested on the bench with just a test LCD, test Battery and test power switch attached and the switch booted fine. Fitting everything back into the case I got the same fault.
Replaced the battery with my test one and the switch booted fine. Replaced the battery in the case and switch is now working 100%.

I thought I'd share as the battery being at fault can be misleading when trying to fix other issues.

 

[Justin20020]

I saw a video from tronicsfix where he repairs several switches with that common problem. If the problem stays even with replacing the port, it can be that several solder points are not connected. You could replace it new by your own if you have solder skills. If the problem stays the same, then you have to replace a chip (dont know which it is. You have to google it) carefully

-edit-

nevermind. I read that you already found the problem lol

 

[SheriffBuck]

Thanks for sharing this. Do you think it could be a faulty sensor on the white lead going into the battery? Can you measure the resistance between white and black lines on a good battery and the one you removed?

 

[Mightyjebus]

Thanks for sharing this. Do you think it could be a faulty sensor on the white lead going into the battery? Can you measure the resistance between white and black lines on a good battery and the one you removed?

I will do once I dig it out of the bin tomorrow!