I wouldn't throw the blame on the user just yet. There's not much in the bottom part of the phone that should be getting hot (certainly not when no charging is going on!).
https://megous.com/dl/tmp/e05b1202e1a053c7.png
What should be getting hot down there? There's nothing there. It's just connector and some protection diodes, vibrator motor (but that one is not thermally connected to the type-C connector, so it would be hard for it to melt the USB-C cable), etc. It's some kind of problem with one of the connectors probably.
Measuring the USB-A side if there's a short or close to it there, might exclude it.
Imperfect connection (increased resistance of the contacts) or misalignment, or dirt might also cause heating of the connectors. Do the connectors lock completely, or is it a bit wiggly, or do the connectors separate easily? They should not.
Too long, or not too good a cable would actually help reduce the power loss on the connector, because pinephone monitors the voltage drop, and if it gets bellow 4.5V on the phone side, it starts reducing current consumption. If you're unlucky and have a very good cable, but not so good contact in the connector, and lose 0.5V on the contact (worst case) and very little in the great cable itself, with 2A going through the connector, that's a whopping 1W being concentrated in the tiny connector. That will probably melt it over time.
"Bad cables" would have the power losses spread more throughout the cable.
https://megous.com/dl/tmp/e05b1202e1a053c7.png
What should be getting hot down there? There's nothing there. It's just connector and some protection diodes, vibrator motor (but that one is not thermally connected to the type-C connector, so it would be hard for it to melt the USB-C cable), etc. It's some kind of problem with one of the connectors probably.
Measuring the USB-A side if there's a short or close to it there, might exclude it.
Imperfect connection (increased resistance of the contacts) or misalignment, or dirt might also cause heating of the connectors. Do the connectors lock completely, or is it a bit wiggly, or do the connectors separate easily? They should not.
(08-25-2021, 10:20 AM)bcnaz Wrote: Simple :
Your cord is much too long !
At 5 volts DC the voltage drop over long cords causes an over-current condition.
If you had the phone turned on, it was probably still discharging, even with the charger plugged-in.
Too long, or not too good a cable would actually help reduce the power loss on the connector, because pinephone monitors the voltage drop, and if it gets bellow 4.5V on the phone side, it starts reducing current consumption. If you're unlucky and have a very good cable, but not so good contact in the connector, and lose 0.5V on the contact (worst case) and very little in the great cable itself, with 2A going through the connector, that's a whopping 1W being concentrated in the tiny connector. That will probably melt it over time.
"Bad cables" would have the power losses spread more throughout the cable.
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