skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Soldering the USB port - does not work

Sat Apr 06, 2019 2:24 pm

Hello,

I try to solder a USB cable directly to the USB port. I saw that others de-solder the complete USB connector but there are PPxx that are connected to the USB contacts. This is where I want to solder to. It does not work and don't know why.
This seems to work: https://raspberrypi.stackexchange.com/q ... -usb-ports
Or here: https://raspberrypi.stackexchange.com/q ... usb-port-c
Test Pads: https://sudomod.com/forum/viewtopic.php?t=1491
When I use a normal cable it works fine. 5V is taken from GPIO pin 4 and GND from pin 6 because USB power is not enough and connected directly to the Delock msata board (this is switched using the jumper).
When I solder a cable to the raspi it does not work. I tried different cables ... I tried all can imagine. Please take a look at the picture.
I measured all connections and they are ok. I have no clue. Btw, I changed D+/D- and vice versa - does not change anything.
Did anyone see something like this? Does anyone know why it does not work?
Are there any reasons why it cannot work?

Thank you very much!
Luke
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Last edited by skyluke on Sat Apr 06, 2019 3:19 pm, edited 1 time in total.

User avatar
bensimmo
Posts: 4187
Joined: Sun Dec 28, 2014 3:02 pm
Location: East Yorkshire

Re: Soldering the USB port - does not work

Sat Apr 06, 2019 3:15 pm

Have you tried PP27 for 5VUSB

P.s. no idea, never used that board.

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sat Apr 06, 2019 3:24 pm

Yes. I tried my cable with USB power, I tried with GPIO power: does not work.
I tried normal cable, with USB 5V and with GPIO power: works fine.
Btw, before cutting the cable I verified that it works. It is the third type of cable that does not work.
What is wrong here?

I have 5V and GND on the Delock board.
I can measure some voltage between D+/D- and GND on the board (whatever I should measure there).
And I can measure that there is an connection between the raspi USB connector and the Delock board.
But the board does nothing. No LED. No boot. Nothing. Like not connected.

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sat Apr 06, 2019 3:47 pm

I don't believe that it is a problem with the Delock board. I believe that it is a problem with what I did. But what is the problem?

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sat Apr 06, 2019 4:19 pm

Should I try to solder them directly to the pin for the port and not to the PPs?
Could that make it better?

drgeoff
Posts: 9923
Joined: Wed Jan 25, 2012 6:39 pm

Re: Soldering the USB port - does not work

Sat Apr 06, 2019 9:12 pm

skyluke wrote:
Sat Apr 06, 2019 4:19 pm
Should I try to solder them directly to the pin for the port and not to the PPs?
Yes.

JohnsUPS
Posts: 129
Joined: Fri Jul 06, 2018 2:13 am
Location: USA

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 2:28 am

skyluke wrote: Should I try to solder them directly to the pin for the port and not to the PPs?
Could that make it better?
Yes - I second that.

If soldered directly to where the pins from the USB connector protrude through the board, there is no reason why that shouldn't work.

Prior to soldering to the PP's (or do you mean TP's - test points?), did you ohm out the through-hole USB connections to these pads before soldering anything first?

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 8:46 am

Whatever I do, it doesn't work.
When I solder a cable to one connector it doesn't work but the normal cable connection still works with that connector.
I tried the same with another connector, soldered connection doesn't work, but the normal connection doesn't work, too.
I believe soldering changes impedance that much, so it doesn't work anymore.

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Imperf3kt
Posts: 2983
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Location: Australia

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 9:29 am

Are you sure the cable you're soldering isn't damaged in some way?
55:55:44:44:4C
52:4C:52:42:41

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Burngate
Posts: 6100
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Location: Berkshire UK Tralfamadore
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Re: Soldering the USB port - does not work

Sun Apr 07, 2019 9:49 am

skyluke wrote:
Sun Apr 07, 2019 8:46 am
Whatever I do, it doesn't work.
When I solder a cable to one connector it doesn't work but the normal cable connection still works with that connector.
I tried the same with another connector, soldered connection doesn't work, but the normal connection doesn't work, too.
I believe soldering changes impedance that much, so it doesn't work anymore.
I'd get out my meter, and with a normal cable plugged into the same socket you've soldered to, measure the resistance between the far ends, pin to pin.
You should get close to zero, but I'm betting you don't.

drgeoff
Posts: 9923
Joined: Wed Jan 25, 2012 6:39 pm

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 9:55 am

skyluke wrote:
Sun Apr 07, 2019 8:46 am
I believe soldering changes impedance that much, so it doesn't work anymore.
Nonsense.

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 10:36 am

Imperf3kt wrote:
Sun Apr 07, 2019 9:29 am
Are you sure the cable you're soldering isn't damaged in some way?
Yes. 4 different cables shouldn't be damaged.

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 10:38 am

Burngate wrote:
Sun Apr 07, 2019 9:49 am
skyluke wrote:
Sun Apr 07, 2019 8:46 am
Whatever I do, it doesn't work.
When I solder a cable to one connector it doesn't work but the normal cable connection still works with that connector.
I tried the same with another connector, soldered connection doesn't work, but the normal connection doesn't work, too.
I believe soldering changes impedance that much, so it doesn't work anymore.
I'd get out my meter, and with a normal cable plugged into the same socket you've soldered to, measure the resistance between the far ends, pin to pin.
You should get close to zero, but I'm betting you don't.
Was one of the first things I did: nearly zero.

skyluke
Posts: 13
Joined: Mon May 14, 2018 1:37 pm

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 10:44 am

I drilled a hole into the case and used a normal cable.

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Imperf3kt
Posts: 2983
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: Soldering the USB port - does not work

Sun Apr 07, 2019 10:44 pm

Where were you supplying 5v from? Your picture only showed three connections and two mystery jumper wires.

I assume this is the board in question?

https://www.delock.com/produkte/1087_mS ... kmale.html
Last edited by Imperf3kt on Mon Apr 08, 2019 7:59 pm, edited 1 time in total.
55:55:44:44:4C
52:4C:52:42:41

Renate
Posts: 6
Joined: Sun Mar 22, 2015 8:16 pm
Location: Boston

Re: Soldering the USB port - does not work

Mon Apr 08, 2019 12:10 am

Just a question out of left field...

Are you sure that your short little cable isn't an OTG cable?
(That would have the ID grounded at the plug going into your red board.)

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bensimmo
Posts: 4187
Joined: Sun Dec 28, 2014 3:02 pm
Location: East Yorkshire

Re: Soldering the USB port - does not work

Mon Apr 08, 2019 4:05 pm

Imperf3kt wrote:
Sun Apr 07, 2019 10:44 pm
Where were you supplying 5v from? Your picture only showed three connections and two mystery jumper wires.
pin 4 and pin 6 of gpio.

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