Hardware Unresponsive Switch After Trinket M0 Internal Install.

[TheKiteKing]

Hi,

Firstly thanks to anyone who can help me with this. I tried to install a Trinket M0 internally as a modchip inside my switch. The switch now won't boot at all. When I plug in the battery the Trinket M0 lights up and makes a very quiet buzzing noise. The fan on the switch doesn't start turning and the screen doesn't light up. I can post my information if anyone needs it. I'm not bad at soldering, I've done other similar things before. Thank you so much to anyone who can help as I can't afford another Switch so fixing this one is really my only option.

Thanks.

 

[CompSciOrBust]

I think I had a similar issue when installing my rebug. Where are you drawing the power from? If you're using the resistor next to the battery make sure you haven't bridged two of them together because they're quite close.

 

[TheKiteKing]

I think I had a similar issue when installing my rebug. Where are you drawing the power from? If you're using the resistor next to the battery make sure you haven't bridged two of them together because they're quite close.

Thanks for replying. I used this layout. Does this help to clear anything up? Thanks.

 

[CompSciOrBust]

Thanks for replying. I used this layout. Does this help to clear anything up? Thanks.

Yes. That's the same setup I used. Look at the wire connected to pin 4 on the trinket. It's connected to a resistor which is very close to another one which is used in the battery decoupling circuit. Make sure no solder is connecting the two.

 

[TheKiteKing]

Yes. That's the same setup I used. Look at the wire connected to pin 4 on the trinket. It's connected to a resistor which is very close to another one which is used in the battery decoupling circuit. Make sure no solder is connecting the two.

Looking at mine now I'm almost certain that I've done exactly what you are describing. Thanks for the help I'm going to have a go at fixing it tomorrow and I'll let you know how it goes .

 

[CompSciOrBust]

Looking at mine now I'm almost certain that I've done exactly what you are describing. Thanks for the help I'm going to have a go at fixing it tomorrow and I'll let you know how it goes .

No problem. The other resistor isn't actually needed so no pressure if you accidentally remove it entirely. I did it and my switch works fine (I asked someone on the ReSwitched discord and they said my switch will probably just charge a bit slower now but in the year I have had the mod I haven't noticed a difference). Good luck.

 

[TheKiteKing]

No problem. The other resistor isn't actually needed so no pressure if you accidentally remove it entirely. I did it and my switch works fine (I asked someone on the ReSwitched discord and they said my switch will probably just charge a bit slower now but in the year I have had the mod I haven't noticed a difference). Good luck.

I took your advice and my switch now boots up again so thank you so much. However when I try and boot into rcm mode / cfw the switch doesn't do anything the screen just stays black. The Trinket does its usual pattern of flashing lights (ending with red and not green). I also tried putting my jig into the joycon rail but it still doesn't work. Using my SX Pro and a jig now also doesn't work. Lol I have basically patched my own switch. Any idea what could be causing this? Thanks again for helping.

 

[Pintglass]

I took your advice and my switch now boots up again so thank you so much. However when I try and boot into rcm mode / cfw the switch doesn't do anything the screen just stays black. The Trinket does its usual pattern of flashing lights (ending with red and not green). I also tried putting my jig into the joycon rail but it still doesn't work. Using my SX Pro and a jig now also doesn't work. Lol I have basically patched my own switch. Any idea what could be causing this? Thanks again for helping.

What did you do when following @CompSciOrBust advice.

 

[TheKiteKing]

What did you do when following @CompSciOrBust advice.

I had accidentally joined the two resistors together with a big blob of solder. I heated it up with the soldering iron and used this tool that I have (not sure of its name) to suck the solder off. Then I resoldered the wire to the resistor making sure that it only covered one of them this time.

 

[Pintglass]

I had accidentally joined the two resistors together with a big blob of solder. I heated it up with the soldering iron and used this tool that I have (not sure of its name) to suck the solder off. Then I resoldered the wire to the resistor making sure that it only covered one of them this time.

Are you talking about the connection point from pin 4 of the trinket, if so there capacitors not resistors and nothing to do with battery decoupling or the charging circuit, although removing the short between pins 5/6 of the m92t36 would cure your problem.

 

[TheKiteKing]

Are you talking about the connection point from pin 4 of the trinket, if so there capacitors not resistors and nothing to do with battery decoupling or the charging circuit, although removing the short between pins 5/6 of the m92t36 would cure your problem.

Yeah it was the one coming from pin 4. Haha I've got no clue what they are but it started working when I stopped them from being connected. I guess that that could've been a crazy coincidence but it did start working .

Edit : Can you clarify what you mean by the pins 5/6 thing please. Do you mean that it would fix my issue with not being able to boot into rcm mode? Thanks.

--------------------- MERGED ---------------------------

 

[Pintglass]

Edit : Can you clarify what you mean by the pins 5/6 thing please. Do you mean that it would fix my issue with not being able to boot into rcm mode? Thanks.

No I meant it would be the cause of your issues before you removed the short.

Is your switch working ok in ofw?

Check you've not shorted the D+ D- connections together.

I'm not sure what that connection is for in the strap diagram that your following (logic maybe) as power seems to be from the bat connection, @mattytrog will be able to help with this.

 

[TheKiteKing]

No I meant it would be the cause of your issues before you removed the short.

Is your switch working ok in ofw?

Check you've not shorted the D+ D- connections together.

I'm not sure what that connection is for in the strap diagram that your following (logic maybe) as power seems to be from the bat connection, @mattytrog will be able to help with this.

Yeah it still works in OFW, just can't get it to boot into rcm mode. Thanks for the help.

 

[Pintglass]

Take an image of your soldering so we can have a look

 

[mattytrog]

Yeah it still works in OFW, just can't get it to boot into rcm mode. Thanks for the help.

If you cannot get it to boot in RCM mode, there are several possibilities...

Missing / Incorrect "part1" uf2 file. Is it TRINKETBOOT? If so, this is incorrect. You need SWITCHBOOT part 1 file, or the Fusee Suite part 1 file for your chip.

Ensure you flash part 1 and part 2, if reflashing part 1.

Secondly, a bad strap somewhere.

Double-check Joycon strap and vol+ strap. If using my UF2s, if soldered correctly, press VOL+ and LED on chip should light.

There is also strap checking features.

Check your GND too. A poor GND can stop straps being pulled low (causes all sorts of issues).

Good luck sir!