Hardware Hardmodded switch won't charge

[whinis]

I have an original switch that I hard modded almost as soon as the firmware for the trinkets were released with a custom designed board with a samd21e on flex to reduce the cutting of the EMI shield. Everything worked fine for awhile. I had a few moves in my life, the switch got neglected and whenever I got back to it it was 100% dead, took 2 nights on a non-pd charger just to get it to report RCM before nearly instantly shutting off.

Once I got it charged up over the coarse of a week I realized that some of my magnet wire had rubbed through each other and I had to modify my hack a bit to prevent it. Even though I could see RCM and send a payload from a PC or phone, the hardmod chip could not. I rearranged the wires but since then I realize outside of rare instances the switch just won't charge, if plugged in it doesn't lose battery but it doesn't gain it either. Originally I thought it was the USB-C port however I tested all the connections with a breakout card. I use hekate and checked the battery info and that's when I saw its properly negotiating USB-PD and getting the correct voltage but the charging IC is reporting its overheated and won't charge. Attached is a view from hekate.

Where should I start debugging this, or is it just time to replace the charging IC?

 

[Hayato213]

What happen to the OEM charger?

 

[whinis]

Nothing? It doesn't charge on dock or standard USB or usb-pd charger

 

[Hayato213]

Nothing? It doesn't charge on dock or standard USB or usb-pd charger

Well your problem is your charger IC chip.

 

[whinis]

Well your problem is your charger IC chip.

Is that why Hekate is reporting temperature hot? Just catch all for charging ic error?

 

[Hayato213]

Is that why Hekate is reporting temperature hot? Just catch all for charging ic error?

Yea it is stating that the temperature for the Charging IC is hot, normally it would says normal.

 

[whinis]

Yea it is stating that the temperature for the Charging IC is hot, normally it would says normal.

That's why I find it odd cause it not hot, I checked it by hand. I assumed that's why it's not charging

 

[Hayato213]

That's why I find it odd cause it not hot, I checked it by hand. I assumed that's why it's not charging

The chip gone bad, you should have stick with OEM charger.

 

[whinis]

Eh it's not the most expensive or worst to replacement

 

[Hayato213]

Eh it's not the most expensive or worst to replacement

I have mine since late 2018, I only been using the oem charger, so it definitely your chargers you are using.

 

[whinis]

View attachment 366430

I have mine since late 2018, I only been using the oem charger, so it definitely your chargers you are using.

That's what's odd cause I have not introduced any new chargers to it. Oh well. I will test a bit more but seems the most likely cause

Post automatically merged: Apr 22, 2023

So I just did the test procedures I found.
As soon as I plug in 5v only or USB-PD the charging IC reports hot. Whenever unplugged its fine so something is wrong with the battery charge IC. Guess ill order one and replace it, fun little weekend project