Switch Lite: Shorted Caps at M92T36 and MAX77620H

Nintendo Questions Nintendo Switch Lite
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1

I have an HDH-0001 Switch Lite that is unable to power on or charge. I’ve tested the USB-C port and power does go through (though for some reason it only charges on one side. It doesn’t charge after reversing the cord, but I can deal with that later). I got to the motherboard and tested the various chips relating to the power/battery. The BQ and the MAX17050 have no issues, but I found one shorted cap at M92 and 3 shorted caps at MAX77620H.

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I am unsure how to go about solving this. My initial thought is to replace the chips and see if that solves the shorts, but I am unsure on whether the other sides of the caps are connected to something that could be the culprit. I am also unsure on whether or not some of the caps are actually an issue. I saw a thread on here that sometimes a cap will appear as a short due to its low resistance.

This is my first time attempting a repair like this, so any guidance on this issue would be greatly appreciated!

Edit: For some reason, I can’t use the photo directly, and I’m only allowed one link due to being a new user…

2

So, here’s the second photo in the form of a reply.

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3

a working v2/lite motherboard has 18~25 ohm to ground on such 0.8v line you circled

4

Are you saying that the resistance of that specific part is low enough to be mistaken as a short, or was that more of a suggestion to check whether the actual resistance value is matches close to those values?

5

exactly, you should check front side max77812 status understanding what stage the switch goes into prior to judge what ic goes wrong

6

you should check front side max77812 status understanding what stage the switch goes into prior to judge what ic goes wrong

I see. Thank you! I missed that chip on my initial search for anything wrong since it wasn’t shown on iFixit’s Switch Lite teardown page. I’ll give it a look and see what I find. Is there anything in this area I should be wary of? Like low resistances or anything?

7

Just measure the voltages, and dont get freak out with the low resistance there

9

I took the motherboard out and tested the caps I can reliably reach in that area. I measured ~0.2mV for each of the caps.

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I also did some additional things. I saw a different post similar to mine, and they were asked to measure certain points, so I did the same.

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Switch Lite Charging Diagnosis
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Since I’m only getting 0.02V at C, that would point the BQ. I don’t know what point D is though.

10

if C point no voltage, you likely have bad m92t

11

I see. Thank you so much for the help! I really appreciate it.

Also, I went back to the post I got the diagram from and turns out it was from you! So, thank past you as well!!! :grin:

I’ll get that replaced once I get the part and hopefully that solves my issue. If not, I guess you’ll see another post from me in the future.

12

Hey! I finally got around to replacing M9 and the Switch powers on and charges now. Thanks again for all the help you gave me!