Hardware Problem with Nintendo Switch after replacing M92T36

[CtrlAltDelirious]

Hi everyone,

Apologies if this has been answered anywhere else already but I'm having a bit of a problem with my Nintendo switch motherboard.

My switch stopped charging a while back and I have only recently been able to get around to checking the board.

Before I did anything, I tested the switch by taking the battery away and connecting an external power supply at 3.7V across the battery terminals. Screen came on, worked like a charm.

Did some digging around and found some shorted capacitors around the M92T36. I replaced the M92T36 and I started to get 0.41 - 0.44A current draw. The battery charged (slowly) but never entered the fast charge stage. Plugged everything back in, tried turning the switch on, nothing. No screen, no sound, nothing.

Took the battery away and used the external supply again. Turned on the switch and it booted drawing about 0.3A current at 3.8V. Still no screen, no audio, etc but the motherboard had booted up and was doing something.

I've since done a bit more probing of capacitors. All the caps around the M92T36 are fine. All the caps around the BQ24193 are fine. All the caps under the NVIDIA Tegra chip are fine (some have low resistance ~45 Ohms).

I then came to the MAX7762 which has about 6 shorted capacitors. My question is what does the MAX do and is this a reason that the screen would stop working? Should I remove the MAX chip and replace it or could it be something else that's causing the capacitors to short out around the chip?

I should point out that the ribbon cables are all fine and I've checked the inline fuse connecting the USB port to the board.

Any help would be greatly appreciated. I've attached a few photos to show the board as it is. The area highlighted shows the capacitors that are currently shorted.

Thanks again.

 

[Avin]

Have you been able to fox this? Having similar issue

 

[jkyoho]

M92T36 area... You can use either 1uF or 2.2uF caps. Whichever you can get the easiest,

View attachment 165083

your highlight are coils not caps but they should not short anyway.
I do see you missing some components on the right side of M92T

 

[redmagejosh]

Not sure is this might be the issue but it seems you might have a short in this area

 

[rdlf4]

your highlight are coils not caps but they should not short anyway.
I do see you missing some components on the right side of M92T

From your attachment, there's a resistor (maybe 402) at the bottom left of the picture.
Would you happen to know its resistance value? Or is that a cap?

 

[jkyoho]

I think you might be talking about that 1kohm_0402 resistor
Pic Credit to Calvin from https://www.tronicsfixforum.com/u/calvin/summary

 

[rdlf4]

View attachment 294072

I think you might be talking about that 1kohm_0402 resistor
Pic Credit to Calvin from https://www.tronicsfixforum.com/u/calvin/summary

Interesting.
I was comparing this with another picture that I found (I believe it was here on GBATemp). There's a mismatch on one of those resistors surrounding the M92 chip.

Which one is correct?

 

[jkyoho]

I have HAC-CPU-10 AND -20 rev M.B by hand, can confirm left side ,10k is what I found on both rev M.B

 

[rdlf4]

I have HAC-CPU-10 AND -20 rev M.B by hand, can confirm left side ,10k is what I found on both rev M.B

I guess the same goes for this one then?