UART adapter hot

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brad
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UART adapter hot

Unread post by brad » Mon Feb 04, 2019 6:41 pm

I've just connected a new hard-kernel usb uart adaptor to a new C2 and I was having trouble getting putty to display characters properly. I went tp pickup the UART adaptor and it was extremely hot (enough to burn the skin). I unplugged it and i'll go back to my old setup for the moment. Should I test it further or a faulty UART board maybe? Thinking of testing my usb power rails on PC to make sure its not overvolted.

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Re: UART adapter hot

Unread post by rooted » Tue Feb 05, 2019 12:29 am

Try it on your other C2 to make sure it's not on the Odroid side.

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Re: UART adapter hot

Unread post by mad_ady » Tue Feb 05, 2019 12:43 am

Happened to a no-name uart of mine too. Burned itself off after a day of being plugged in.

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Re: UART adapter hot

Unread post by brad » Tue Feb 05, 2019 7:22 pm

rooted wrote:
Tue Feb 05, 2019 12:29 am
Try it on your other C2 to make sure it's not on the Odroid side.
I don't think it is the C2 side. The UART connector was the cooler side with the wires cold, stainless mini usb connector and Samsung chip the hot parts.

I can use the new C2 with my old cheap adaptor fine (this adaptor does not use 3.3 volt pin on c2) but I do not want to plug the "hot" adaptor into the old C2 (sentimental value :) even though its sd connector is done for :( )

I'll do some tests it might even be the supplied USB cable, i will connect it to a USB supply in the shed that I don't care for and no UART device to see if I can reproduce the heat.

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Re: UART adapter hot

Unread post by mad_ady » Tue Feb 05, 2019 7:59 pm

You can connect the c2's uart port to a different C1/C2 on the uart from the gpio pins and use just jumper wires. You need to connect only rx/tx (crossover) and gnd.

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Re: UART adapter hot

Unread post by brad » Tue Feb 05, 2019 8:51 pm

mad_ady wrote:
Tue Feb 05, 2019 7:59 pm
You can connect the c2's uart port to a different C1/C2 on the uart from the gpio pins and use just jumper wires. You need to connect only rx/tx (crossover) and gnd.
Thanks mad_ady but my storey actually gets a little more complex :ugeek:, firstly I can use my old unbranded adaptor on both C2's no worries :) But the old adaptor don't work on my N1 :(

I bought a hardkernel uart adaptor for the N1 when I bough my new C2 (but tried it on the new C2 at first when it become very hot)

My old C2 has a lot of sentimental value and the N1 is irreplaceable so I will try the shed burn test first before I consider to plug into the N1.

I still need access to N1 console somehow to try mainline debug, I think ill try order a new hard-kernel UART adaptor if I can find one local or with reasonable shipping.

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Re: UART adapter hot

Unread post by mad_ady » Wed Feb 06, 2019 12:34 am

I understand your concern :) For now you can use the n1's gnd and tx with c2's gnd and rx gpio pins, but for tx you'll need a small voltage divider...

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Re: UART adapter hot

Unread post by cdu13a » Wed Feb 06, 2019 1:14 am

brad wrote:
Tue Feb 05, 2019 7:22 pm
rooted wrote:
Tue Feb 05, 2019 12:29 am
Try it on your other C2 to make sure it's not on the Odroid side.
I don't think it is the C2 side. The UART connector was the cooler side with the wires cold, stainless mini usb connector and Samsung chip the hot parts.

I can use the new C2 with my old cheap adaptor fine (this adaptor does not use 3.3 volt pin on c2) but I do not want to plug the "hot" adaptor into the old C2 (sentimental value :) even though its sd connector is done for :( )

I'll do some tests it might even be the supplied USB cable, i will connect it to a USB supply in the shed that I don't care for and no UART device to see if I can reproduce the heat.
Does the adapter get hot just plugged in not connected to the board?

I've had problems before with various devices due to vendor supplied USB cables. Usually due to a bad, short or no connection in the cable on one of the lines. Nothing like bashing head off wall for an hour or two trying to figure out why the drivers don't work just to discover a bad connection in the data line of the USB cable. I've also come across a few USB cables where the micro/mini connector will heat up when used to charge a device because of a crappy connection in the connector on the cable.

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Re: UART adapter hot

Unread post by odroid » Wed Feb 06, 2019 12:01 pm

Just use only three wires (Rx/Tx/GND lines) if you don't have our official USB-UART cable.
https://wiki.odroid.com/accessory/devel ... _connector

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Re: UART adapter hot

Unread post by brad » Wed Feb 06, 2019 4:35 pm

odroid wrote:
Wed Feb 06, 2019 12:01 pm
Just use only three wires (Rx/Tx/GND lines) if you don't have our official USB-UART cable.
https://wiki.odroid.com/accessory/devel ... _connector
Hi odroid,
this is my issue the hardkernel UART adapter gets hot when plugged in and not working on C2. My old 3 wire setup works ok.

I will test it out shortly with nothing plugged in to see if I can reproduce, ill try another usb cable also.

Thanks,
Brad.

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Re: UART adapter hot

Unread post by brad » Wed Feb 06, 2019 5:52 pm

OK plugged it into another usb supply for 30 mins (no uart connected), no overheating issue (warm to the touch).

Then I plugged it back into the origional USB socket and no issues with heat.

As soon as I plug it into the C2 within seconds it becomes to hot to touch. Even without the usb connected and just the UART to the C2 the problem occurs so id say its a faulty uart board. I think I will just order anther one. Hardkernel are back next week?

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Re: UART adapter hot

Unread post by rooted » Wed Feb 06, 2019 10:47 pm

You had a C2 go wonky on you, now a new UART. Bad luck :(

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Re: UART adapter hot

Unread post by odroid » Thu Feb 07, 2019 9:26 am

I see.
We will send you another USB-UART board early next week.
Please don't order anything at this moment. ;)

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Re: UART adapter hot

Unread post by mad_ady » Thu Feb 07, 2019 3:44 pm

If @brad is anything like me he'll have a broken uart adapter that he *can't* throw away and will try various things to put it to use somehow :)

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Re: UART adapter hot

Unread post by brad » Thu Feb 07, 2019 6:27 pm

odroid wrote:
Thu Feb 07, 2019 9:26 am
I see.
We will send you another USB-UART board early next week.
Please don't order anything at this moment. ;)
Thanks odroid :D

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Re: UART adapter hot

Unread post by brad » Wed Feb 20, 2019 4:30 pm

mad_ady wrote:
Wed Feb 06, 2019 12:34 am
I understand your concern :) For now you can use the n1's gnd and tx with c2's gnd and rx gpio pins, but for tx you'll need a small voltage divider...
mad_ady wrote:
Thu Feb 07, 2019 3:44 pm
If @brad is anything like me he'll have a broken uart adapter that he *can't* throw away and will try various things to put it to use somehow
You were right :) so i'm going to reuse the cable to make a C2 -> N1 UART adaptor. I have a voltage divider so I will only need it for C2 tx's to N1?

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Re: UART adapter hot

Unread post by odroid » Wed Feb 20, 2019 4:57 pm

@brad,
I thought we put the UART kit in to your N2 sample package.
But we had internal miscommunication. :(
We will send you tomorrow.

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Re: UART adapter hot

Unread post by brad » Wed Feb 20, 2019 5:17 pm

odroid wrote:
Wed Feb 20, 2019 4:57 pm
@brad,
I thought we put the UART kit in to your N2 sample package.
But we had internal miscommunication. :(
We will send you tomorrow.
Its not a problem, i'm happy to play with the N2 :)

As per mad_ady I think I can make a cable to do the job for N1 UART using C2 40-pin + voltage converters (or maybe now the N2 40pin).

There is no hurry for the UART, I can use workarounds until I next time I make an order. Would you like the old one back to test?

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Re: UART adapter hot

Unread post by odroid » Wed Feb 20, 2019 5:28 pm

Don't try the complicated interface. You might fry your boards due to uncertain IO level mismatch.

We've shipped over 10K of USB-UART kit and the defective rate must be extremely low.
So I don't think we need an intensive failure analysis at this moment.
Just throw away the dead adapter.

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Re: UART adapter hot

Unread post by brad » Thu Mar 07, 2019 4:12 pm

Hi odroid,
thanks I received the new UART adaptor but unfortunately I have the same problem , not working and getting way to hot. I have closed it down to only 1 thing in common between all my setups. 1) Me

I must be missing something completely obvious or doing something trivially wrong :?: as its not difficult to hook up. ie I have it connected to the USB port on windows 10 machine and connect to UART on the C2 or N2 ensuring everything is insulated / away from the boards. Drivers are installed as per wiki for windows and using putty with correct settings.

I feel it has to be me doing something completely silly but I can not imaging what? By hot I mean really hot and the entire UART board(s). The blue leds are always on and glow very dim at first and then glow brighter the hotter it gets.

My 3 wire old setup (3.3v) works fine on 2xc2's & 1xN2 but it does not work on the N1. I'm fearful of connecting any of the 2 new UARTS to the N1 to try it. Should I try to cut the red sense wire on UART connector and connect to a C2 again to try? I think it's the only wire that could transfer that much power to produce the heat as the problem occurs with USB disconnected.

I feel I should send both UART devices (and all cables) back for you to check? I wonder if there is some way I could have damaged them both, they both were plugged into a windows machine's USB first is the only other thing in common, 2 different hubs on the machine and the power voltage output from its USB is fine.

Thanks.

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Re: UART adapter hot

Unread post by mad_ady » Thu Mar 07, 2019 4:32 pm

Can you post a picture of the uart and its connector?
Also - have you tried plugging the USB end in a C2 and seeing what happens?

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Re: UART adapter hot

Unread post by odroid » Thu Mar 07, 2019 5:29 pm

Nope. The sense wire must be connected since it is VDD-IO.
I think something could be wrong with ODROID board not USB-UART.

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Re: UART adapter hot

Unread post by mad_ady » Thu Mar 07, 2019 5:37 pm

@brad: you can also try a loopback test where you short RX and TX in your UART and see if you get echo when connecting to it (only USB plugged in). You should see your keystrokes when you connect to it with screen. That would validate that the uart chip works.

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Re: UART adapter hot

Unread post by rooted » Thu Mar 07, 2019 10:05 pm

Have you tried another USB port or another PC? If not that would be in common also.

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Re: UART adapter hot

Unread post by brad » Fri Mar 08, 2019 3:29 pm

odroid wrote:
Thu Mar 07, 2019 5:29 pm
Nope. The sense wire must be connected since it is VDD-IO.
I think something could be wrong with ODROID board not USB-UART.
It would be strange for the problem to occur in 3 boards, 2 x C2's and N2. Also different type of UART is working fine with 3 wires on all 3 boards. The UART gets hot plugged into only the odroid (no usb)

I have attached some pictures, I will try the loopback test.

The Uart is very hot when plugged in as in the first picture after 30 secs. Starting to smell like burning electrical and hot to touch the UART.
Attachments
C2_UART.jpg
C2_UART.jpg (209.77 KiB) Viewed 2865 times
hardkernel_UARTs.jpg
hardkernel_UARTs.jpg (205.51 KiB) Viewed 2865 times
3boards_uarts.jpg
3boards_uarts.jpg (276.77 KiB) Viewed 2865 times

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Re: UART adapter hot

Unread post by brad » Fri Mar 08, 2019 3:32 pm

Here is what my working 3 wire UART looks like (Could it damage all the boards?) Its works fine and I never connect its red wire.
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Re: UART adapter hot

Unread post by brad » Fri Mar 08, 2019 3:54 pm

During a loopback test (plugged into usb and 2 middle uart side wires linked) device is recognised and the D1 blue led blinks when I type something but I do not see an echo. No overheating issues though.

I just plugged it back into the C2 for another end to end test and I get output for around 20 seconds on my console but then uart board gets hot and it starts to produce bad characters before it stops working and the blue leds on uart board have weird behavior.

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Re: UART adapter hot

Unread post by brad » Fri Mar 08, 2019 4:06 pm

If it is the 3 wire UART that has broken the C2's and N2 somehow, then I still have the N1 left which has never had UART plugged in. Its seems risky to try it?

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Re: UART adapter hot

Unread post by mad_ady » Fri Mar 08, 2019 5:31 pm

Normally the adapter should not get hot and should work in loopback mode while connected just to usb... Since all overheat, I wouldn't plug them in the N1 just yet..,

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Re: UART adapter hot

Unread post by Tilde » Fri Dec 27, 2019 12:22 am

Hello,

I have the same problem. I have HK-ODROID-HC2 board. First UART adapter has been fried, when it was connected to my notebook. Before driver installation the chip was cold( it was connected to PC and to HC2 board, too). In next step I installed the driver and I connect to HW by terminal program. After some secs (cca.1000secs), the PC driver loss the connection with usb HW, and the adapter chip goes to be extremely hot. I disconnect it. On the second try the chip was fired out. I sent it back. I buy the same uart adapter again (HK-USB-UART-ODROID). The problem is same. Uart adapter is burnt. I used the same Odroid HC2, but another PC.

What was the solution in previous case? Please

p.s. I tried to run Open Media Vault on my Odroid HC2, but I cant communicate with my Odroid over Ethernet. I cant find Odroid on my LAN -network. It was the reason to try debugging by UART adapter.

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Re: UART adapter hot

Unread post by brad » Fri Dec 27, 2019 7:48 am

Tilde wrote:
Fri Dec 27, 2019 12:22 am
Hello,
I have the same problem. I have HK-ODROID-HC2 board.
The issue on my C2 was related to the uart boards which were replaced to resolve the problem. I'm unsure how things work on a HC2 though.
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Re: UART adapter hot

Unread post by Magnumline » Tue Jan 07, 2020 10:27 am

Hello,

This is a bit of a "me too" comment. My UART adapter (Board Rev. 0.2, 2012-6-29) melted recently and I was about to order a replacement. Is it a known defect or have I been using it incorrectly?

I had been using it on Odroid-HC1, -HC2, and -C2 devices with the 4-wire connector, and each time the CP2102N chip heated up, so I kept my sessions brief. Until I left it connected for a few days and one morning the room smelled of melted electronics. My host kernel logs showed the death march of the USB disconnecting and reconnecting for 20 minutes while the plastic oozed out. By the time I disconnected the board, the surface temperature of the chip was above 125C. If it can help, I am including some photos of the melted chip.

If I order a replacement board, will it have the same vulnerability? Should I have just disconnected one of the wires?

Thanks in advance.
2.jpg
Overheated board
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4.jpg
CP2102N melted
4.jpg (296.8 KiB) Viewed 555 times

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Re: UART adapter hot

Unread post by odroid » Tue Jan 07, 2020 5:42 pm

First of all, sorry about the problem.
PCB Rev 0.2 with the CP2012N chipset had the issue.
Rev 0.3 fixed the reverse current problem several months ago and we scrapped all the Rev 0.2.

Can you tell me when and where did you buy the USB-UART adapter kit?

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Re: UART adapter hot

Unread post by Magnumline » Tue Jan 07, 2020 8:13 pm

Hi, thanks for getting back to me.
Can you tell me when and where did you buy the USB-UART adapter kit?
I bought the adapter from the HardKernel web store on 2019/01/21.

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Re: UART adapter hot

Unread post by odroid » Wed Jan 08, 2020 11:44 am

Right. that production batch had 4~5% of the reverse current problem. :(

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