Hardware M92T36 or BQ24193

[Pintglass]

hmmm how do i test that ? do i need to test all those points ? continuity against ground ?

Test for continuity from one side to the other of the choke

 

[Agilato]

Test for continuity from one side to the other of the choke

And also that choke doesn't have lines shorted to each-other.

 

[solac]

Sorry for the late reply been kinda busy these days. Hmmm let me see if i understand this correctly. So all same number chokes should have continuity, and they are not suppose to have continuity to other chokes with different numbers (e.g.choke 1 continuity to choke 1). Pintglass was wondering if your's had docking issues? seems to me that we have the same issues from the broken charge port to a shorted P13USB. I haven't tested the switch with the dock.

 

[Pintglass]

Sorry for the late reply been kinda busy these days. Hmmm let me see if i understand this correctly. So all same number chokes should have continuity, and they are not suppose to have continuity to other chokes with different numbers (e.g.choke 1 continuity to choke 1). Pintglass was wondering if your's had docking issues? seems to me that we have the same issues from the broken charge port to a shorted P13USB. I haven't tested the switch with the dock.

Have you not got a dock to test it in, it may work as it is.

 

[solac]

Have you not got a dock to test it in, it may work as it is.

I don't have a dock, il try to borrow one and test it out. I will update soon as i tested it.

Was i correct on how to check continuity with the common chokes?

 

[Pintglass]

I don't have a dock, il try to borrow one and test it out. I will update soon as i tested it.

Was i correct on how to check continuity with the common chokes?

Each choke has 2 lines in it check that you have continuity on each line from one side to the other. Imagine that your just testing a piece of wire as that's all they really are.

 

[paraskevas]

Hey guys, I'm trying to troubleshoot a non-working switch I got.

Switch seems to charge but it doesn't boot. I also has AutoRCM installed. The Switch died after plugging it into a dodgy USB port of a PC.

Battery voltage is 3.8V without the charger and 4.0V plugged into Nintendo charger.

Here are my findings after reading the thread:
1) Pin 5 on M92T36 has 3.3V (meter shows 3.28V) and isn't shorted to ground. Pin has 0V when I plug in the battery, changes to 3.3V when I plug the charger and then stays at 3.3V even if I remove the charger.

2) I could not find any capacitors that are shorted near M92T36, BQ24193 or P13USB. I could only find some shorted capacitors. I've marked them on the attached photo.

The Switch seems to make a really high pitched noise when plugged to the charger. I couldn't hear any noise (though the case) on my working Switch.

 

[Pintglass]

2) I could not find any capacitors that are shorted near M92T36, BQ24193 or P13USB. I could only find some shorted capacitors. I've marked them on the attached photo.

There not capacitors they are inductor's

Have you tried to connect the switch to a pc after you've inserted the charger, does the pc recognise it.

 

[paraskevas]

There not capacitors they are inductor's

Have you tried to connect the switch to a pc after you've inserted the charger, does the pc recognise it.

No, it doesn't make any sound. I've tried with my working Switch to be sure drivers etc work. I have tried connecting it without the eMMC, will it show up as RCM without it?

Edit:
I've found this wiki entry: https://switchbrew.org/wiki/Testpads

Measuring across Cluster B 6 and 4 gives me -4.0V. Measuring across 6 and 5 I get -4.5V. Not sure why I get negative voltages (black probe is on 6 which is ground).

 

[Pintglass]

Measuring across Cluster B 6 and 4 gives me -4.0V. Measuring across 6 and 5 I get -4.5V. Not sure why I get negative voltages (black probe is on 6 which is ground).

Do you get the same readings on the pins of m92T36, are the readings with a charger plugged in.
Are you sure you've not got a short on the 3v3 rail

 

[Agilato]

Inductors can make that sound, Video chip can go bad common situation with non original docks. Does it load hekate?

 

[fnwhatnow]

Guys,

I have a switch that will boot hektate only, it also doesn't seem to want to fast charge.

When I plug in the charger I get nothing on the screen, no power indication.

I tested the continuity across the caps by the M92T36, BQ24193 and P13USB, no issues.

Because the last unit I repaired had a P13USB issue, I just went ahead and replaced it as I had ordered 2.

I pulled the board out and plugged in a battery and a USB-C through a USB tester. I get .48 amps at 5volts being pulled.

Because everything checked out good and I was stumped I tossed it into RCM mode and was able to boot to hektate!

It came up and the screen works, everything looks good.

No clue what this is now, is it a hardware problem or a firmware issue?

Thanks!

 

[Pintglass]

Guys,

I have a switch that will boot hektate only, it also doesn't seem to want to fast charge.

When I plug in the charger I get nothing on the screen, no power indication.

I tested the continuity across the caps by the M92T36, BQ24193 and P13USB, no issues.

Because the last unit I repaired had a P13USB issue, I just went ahead and replaced it as I had ordered 2.

I pulled the board out and plugged in a battery and a USB-C through a USB tester. I get .48 amps at 5volts being pulled.

Because everything checked out good and I was stumped I tossed it into RCM mode and was able to boot to hektate!

It came up and the screen works, everything looks good.

No clue what this is now, is it a hardware problem or a firmware issue?

Thanks!

What charger are you using?

 

[Agilato]

Guys,

I have a switch that will boot hektate only, it also doesn't seem to want to fast charge.

When I plug in the charger I get nothing on the screen, no power indication.

I tested the continuity across the caps by the M92T36, BQ24193 and P13USB, no issues.

Because the last unit I repaired had a P13USB issue, I just went ahead and replaced it as I had ordered 2.

I pulled the board out and plugged in a battery and a USB-C through a USB tester. I get .48 amps at 5volts being pulled.

Because everything checked out good and I was stumped I tossed it into RCM mode and was able to boot to hektate!

It came up and the screen works, everything looks good.

No clue what this is now, is it a hardware problem or a firmware issue?

Thanks!

First try briccmii tool.
I have water damaged switch that behaves exactly same way... my guess problem around BQ chip... compare small elements around it....

 

[paraskevas]

Do you get the same readings on the pins of m92T36, are the readings with a charger plugged in.
Are you sure you've not got a short on the 3v3 rail

I do get the same readings. The readings are with a charger and no battery connected. I don't have a short in the 3.3V rail!

Inductors can make that sound, Video chip can go bad common situation with non original docks. Does it load hekate?

It doesn't load anything. PC doesn't recognize it at all. It only charges at .45A (and then drops when I presume the battery is full)

 

[Agilato]

Check chokes right before Video Chip, you should be able to read continuity on each line.

 

[Pintglass]

I do get the same readings. The readings are with a charger and no battery connected. I don't have a short in the 3.3V rail!

Are you using an original nintendo charger, check to see if you have a short on the usb D+ and D- lines

 

[paraskevas]

Check chokes right before Video Chip, you should be able to read continuity on each line.

I can read continuity on each choke (on opposite pins)

Are you using an original nintendo charger, check to see if you have a short on the usb D+ and D- lines

Yes. Only original charger and official cable (from Pro Con) when connecting to PC. No short there. I also plugged the cable and confirmed continuity from the male end (USB A) to the board test pads

 

[Pintglass]

Yes. Only original charger and official cable (from Pro Con) when connecting to PC. No short there. I also plugged the cable and confirmed continuity from the male end (USB A) to the board test pads

Check that you've got continuity on the choke just above the usb port on the D+ D- lines, if you've tested for continuity up to the usb test points under the audio chip then its fine.

 

[paraskevas]

Check that you've got continuity on the choke just above the usb port on the D+ D- lines, if you've tested for continuity up to the usb test points under the audio chip then its fine.

What chokes are you referring to?