Hi! I've been chasing this issue for a few days now where my Switch v1 won't charge the joycons and spin up the fan when it's connected to a 15V charger or docked which results with it overheating on the dock. This issue doesn't occur when I use a 5V charger.
I've already changed M92 for a known good one and checked around MAX8969 area (AJZ chip) where voltage for the fan and joycons comes from. I figured out that when I connect a 15V charger (original Nintendo one) this chip doesn't get an EN signal (1.8V) which means something on the board isn't telling it to turn on.
By looking at the PCB scans available online I traced EN signal to two places. First being the component marked 42 nearby the dual mosfet (PP5) where the output of 8969 is connected and the second being the CPU. I think this signal originates from the CPU and firmware since this 42 IC is connected to the gate of the dual mosfet. I might be wrong here, but it seems like it's there to let the output of 8969 through when EN is present.
Now, here comes the interesting part. Since my switch is moddable I booted up Linux and fan works there without any issues on a 15V charger. Joycon charging still doesn't work there but I think it's not supported. So I rebuild my eMMC with a fresh OS guessing it's the firmware at fault but it didn't solve this.
I've come to this point with the help of TronicsFix forum users and that's where the original thread is, but I decided to start a new one here to maybe reach someone who had this weird issue before. I'm really out of ideas at this point.
Thanks!
I've already changed M92 for a known good one and checked around MAX8969 area (AJZ chip) where voltage for the fan and joycons comes from. I figured out that when I connect a 15V charger (original Nintendo one) this chip doesn't get an EN signal (1.8V) which means something on the board isn't telling it to turn on.
By looking at the PCB scans available online I traced EN signal to two places. First being the component marked 42 nearby the dual mosfet (PP5) where the output of 8969 is connected and the second being the CPU. I think this signal originates from the CPU and firmware since this 42 IC is connected to the gate of the dual mosfet. I might be wrong here, but it seems like it's there to let the output of 8969 through when EN is present.
Now, here comes the interesting part. Since my switch is moddable I booted up Linux and fan works there without any issues on a 15V charger. Joycon charging still doesn't work there but I think it's not supported. So I rebuild my eMMC with a fresh OS guessing it's the firmware at fault but it didn't solve this.
I've come to this point with the help of TronicsFix forum users and that's where the original thread is, but I decided to start a new one here to maybe reach someone who had this weird issue before. I'm really out of ideas at this point.
Thanks!
