MishterKirby
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[SOLVED] Is the USB-C port supposed to get hot during use?

Mon Jan 04, 2021 8:49 pm

My Pi 4's USB-C port gets unbearably hot during use. Is that normal?
Last edited by MishterKirby on Tue Jan 05, 2021 8:43 pm, edited 1 time in total.
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Re: Is the USB-C port supposed to get hot during use?

Mon Jan 04, 2021 9:29 pm

MishterKirby wrote:
Mon Jan 04, 2021 8:49 pm
My Pi 4's USB-C port gets unbearably hot during use. Is that normal?
In my experience that isn't "normal".
How hot is "unbearably hot"? (Eg. what does vcgencmd measure_temp report for the Pi's "temperature"?)
What are you using to power the P4B?
If not an "official PSU"** does it have a separate USB3 A to USB3 C lead and/or an in-line switch?
Is the P4B in a case? If so which case?
Trev.
** Some, UK, examples here: https://www.cpmspectrepi.uk/raspberry_p ... ne_2019.29
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's & P400. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Re: Is the USB-C port supposed to get hot during use?

Mon Jan 04, 2021 9:54 pm

Code: Select all

pi@raspberrypi:~ $ vcgencmd measure_temp
temp=57.4'C
But if I touch the connector itself, it 's hotter than that. I'd say at least 70C.

Also, I can't boot if I use a specific power brick, for some reason, so I've been using my PC's USB port to power it. I'll try with another brick and report back.

EDIT:
I just noticed, the chip on top of the USB port is getting really hot. I don't think that's normal.
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Re: Is the USB-C port supposed to get hot during use?

Mon Jan 04, 2021 10:13 pm

MishterKirby wrote:
Mon Jan 04, 2021 9:54 pm

Code: Select all

pi@raspberrypi:~ $ vcgencmd measure_temp
temp=57.4'C
But if I touch the connector itself, it 's hotter than that. I'd say at least 70C.

Also, I can't boot if I use a specific power brick, for some reason, so I've been using my PC's USB port to power it. I'll try with another brick and report back.

EDIT:
I just noticed, the chip on top of the USB port is getting really hot. I don't think that's normal.
Your core temp is O.K. The metal casings of the USB ports etc. are used as heat sinks so can get hot. W.r.t. the USB C connector, since you're not using an official PSU with a fixed cable then I'd suspect the connector of your USB3A to C cable - what make/type is it?
Trev.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's & P400. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 4:29 pm

I use a USB to microUSB cable with a micro-to-C adapter. The cable is from and old pair of headphones, and I'll have to try with an actual power brick.

(I know the Pi 4 requires 3 amps to run at full speed, but I don't have one, and haven't had the chance to buy one, either.)

EDIT:
Just tried two different power bricks, the Pi does not boot, but they're rated for 5V, 1.5A, which is higher than my PC can provide. Weird
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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 4:36 pm

MishterKirby wrote:
Tue Jan 05, 2021 4:29 pm
I use a USB to microUSB cable with a micro-to-C adapter. The cable is from and old pair of headphones, and I'll have to try with an actual power brick.

(I know the Pi 4 requires 3 amps to run at full speed, but I don't have one, and haven't had the chance to buy one, either.)
A uUSB connector + adapter is not rated to "handle" the maximum current that a true USB C connector can so it's probably that (and the old cable) that's getting hot. What do you have plugged in to the USB ports of the P4B?
Trev.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's & P400. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 4:47 pm

What do you have plugged in to the USB ports of the P4B?
Nothing, it's running headless.
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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 6:28 pm

MishterKirby wrote:
Tue Jan 05, 2021 4:47 pm
What do you have plugged in to the USB ports of the P4B?
Nothing, it's running headless.
O.K. running what?
Trev.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's & P400. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 7:52 pm

It's running Raspberry Pi OS Lite, with ssh and VNC enabled.

Also tried with a USB-A to USB-C cable. When I connect it to a power brick, all the Pi does is blink the ACT LED twice (one long, one short).

Also, the chip circled gets hot to the touch.
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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 8:16 pm

MishterKirby wrote:
Tue Jan 05, 2021 7:52 pm
It's running Raspberry Pi OS Lite, with ssh and VNC enabled.

Also tried with a USB-A to USB-C cable. When I connect it to a power brick, all the Pi does is blink the ACT LED twice (one long, one short).

Also, the chip circled gets hot to the touch.
More info. on the "power brick" is needed (eg. is it USB-C 'phone charger** or power-bank****?)
What does the red PoWeR led do?
If you connect the Pi to a HDMI monitor/TV input and try booting without a uSDHC/XC card present do you get a diagnostic screen: http://www.cpmspectrepi.uk/raspberry_pi ... stics.html
Trev.
** like this: http://www.cpmspectrepi.uk/raspberry_pi ... .2FCharger
**** or this http://www.cpmspectrepi.uk/raspberry_pi ... d)B41.html
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's & P400. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 8:21 pm

FTrevorGowen wrote:
Tue Jan 05, 2021 8:16 pm
MishterKirby wrote:
Tue Jan 05, 2021 7:52 pm
It's running Raspberry Pi OS Lite, with ssh and VNC enabled.

Also tried with a USB-A to USB-C cable. When I connect it to a power brick, all the Pi does is blink the ACT LED twice (one long, one short).

Also, the chip circled gets hot to the touch.
More info. on the "power brick" is needed (eg. is it USB-C 'phone charger** or power-bank****?)
What does the red PoWeR led do?
If you connect the Pi to a HDMI monitor/TV input and try booting without a uSDHC/XC card present do you get a diagnostic screen: http://www.cpmspectrepi.uk/raspberry_pi ... stics.html
Trev.
** like this: http://www.cpmspectrepi.uk/raspberry_pi ... .2FCharger
**** or this http://www.cpmspectrepi.uk/raspberry_pi ... d)B41.html
It's a phone charger, and the PWR LED stays on constantly.

Also, I don't have a microHDMI cable to see screen output, but it does the same thing if I plug it into the wall without an SD card. It does attempt to boot if I plug it into the PC, though.
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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 8:30 pm

MishterKirby wrote:
Tue Jan 05, 2021 8:21 pm
FTrevorGowen wrote:
Tue Jan 05, 2021 8:16 pm
MishterKirby wrote:
Tue Jan 05, 2021 7:52 pm
It's running Raspberry Pi OS Lite, with ssh and VNC enabled.

Also tried with a USB-A to USB-C cable. When I connect it to a power brick, all the Pi does is blink the ACT LED twice (one long, one short).

Also, the chip circled gets hot to the touch.
More info. on the "power brick" is needed (eg. is it USB-C 'phone charger** or power-bank****?)
What does the red PoWeR led do?
If you connect the Pi to a HDMI monitor/TV input and try booting without a uSDHC/XC card present do you get a diagnostic screen: http://www.cpmspectrepi.uk/raspberry_pi ... stics.html
Trev.
** like this: http://www.cpmspectrepi.uk/raspberry_pi ... .2FCharger
**** or this http://www.cpmspectrepi.uk/raspberry_pi ... d)B41.html
It's a phone charger, and the PWR LED stays on constantly.

Also, I don't have a microHDMI cable to see screen output, but it does the same thing if I plug it into the wall without an SD card. It does attempt to boot if I plug it into the PC, though.

Try a Power Supply ??

https://www.raspberrypi.org/products/ty ... er-supply/
The information is out there....you just have to let it in.

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MishterKirby
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Re: Is the USB-C port supposed to get hot during use?

Tue Jan 05, 2021 8:36 pm

Ok, will report back when I get one.
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Re: [SOLVED] Is the USB-C port supposed to get hot during use?

Thu Apr 22, 2021 6:37 pm

Forgot to mention, I got a Nintendo Switch recently, and I've been using it's charger to power my Pi as well, and everything works fine except that when the Pi is working at full load, it shuts off abruptly, but I'm assuming that since the Switch supports USB-C PD, it cuts off the current instead of raising the voltage and amperage, since the Pi does not support it.
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Re: [SOLVED] Is the USB-C port supposed to get hot during use?

Thu Apr 22, 2021 8:16 pm

MishterKirby wrote:
Thu Apr 22, 2021 6:37 pm
Forgot to mention, I got a Nintendo Switch recently, and I've been using it's charger to power my Pi as well, and everything works fine except that when the Pi is working at full load, it shuts off abruptly, but I'm assuming that since the Switch supports USB-C PD, it cuts off the current instead of raising the voltage and amperage, since the Pi does not support it.
the PD protocol requires active communication with the power sink before raising the voltage
as you said, the rpi doesnt support that, so the voltage is locked to 5v, and when you exceed the current limit, the PSU is probably just deciding to shut off, assuming something was shorted out

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Re: [SOLVED] Is the USB-C port supposed to get hot during use?

Thu Apr 22, 2021 8:23 pm

Usb cables can get hot as you draw more current through them because wires are conductors. This is especially true for thinner wires.

The chip you circled is meant to get hot, it's the main power regulator for the Pi and passes all the energy through it.
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Re: [SOLVED] Is the USB-C port supposed to get hot during use?

Thu Apr 22, 2021 9:25 pm

OK, makes sense.
The only thing that I don't get is that it refuses to boot with power bricks I've used before.
I remember accidentally shorting two GPIOs with my multimeter more or less when the problem started, but the Pi still boots with other cables, so I'm quite confused.
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