berry25
Posts: 6
Joined: Thu Dec 25, 2014 8:20 pm

AV Connector oxidized

Mon May 18, 2015 4:41 pm

Hello all,

My raspberry bought in 2015..
Image

Audio/Video connector oxidized :(
Anyone have same problem?

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rpdom
Posts: 14984
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: Connector oxidized

Mon May 18, 2015 5:18 pm

Mine is quite a bit older, but looks similar
avjack.jpg
avjack.jpg (24.37 KiB) Viewed 1409 times
I'm not bothered. I either run it headless or with HDMI.

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solar3000
Posts: 1051
Joined: Sat May 18, 2013 12:14 am

Re: Connector oxidized

Mon May 18, 2015 5:45 pm

looks like a QC issue.
Can you scrape the contacts inside?
like with a Dremel bit?

Image
Antikythera

spock
Posts: 205
Joined: Sun Oct 02, 2011 10:33 am

Re: Connector oxidized

Fri Apr 05, 2019 4:14 pm

i have the same problem on all of my raspberry pi 3bs. :( seems to only take 1 year or so.

Notupus
Posts: 34
Joined: Tue Jun 19, 2018 9:57 am

Re: AV Connector oxidized

Fri Apr 05, 2019 7:21 pm

All my pies have this connector corroded but my 3b+ just ain't having it. They are corroded that much that they fail.

mrreality13
Posts: 56
Joined: Tue Feb 26, 2019 6:45 am
Location: texas usa

Re: AV Connector oxidized

Sat Apr 06, 2019 12:14 am

also try DeoxIT 5% Spray Contact Cleaner,i use it to clean vintage stereos from 60/70's
https://www.amazon.com/Hosa-D5S-6-DeoxI ... B00006LVEU
remember ,never approach a computer thinking this will only take a minute
~~pi zero w and a 3b+

Milliways
Posts: 432
Joined: Fri Apr 25, 2014 12:18 am
Location: Sydney, Australia

Re: AV Connector oxidized

Sat Apr 06, 2019 3:52 am

It isn't "corrosion" it is oxidation of the cadmium plating, and is quite normal (and harmless).

If you use it it should work, but attempting to "clean" is likely to do more harm than good.

spock
Posts: 205
Joined: Sun Oct 02, 2011 10:33 am

Re: AV Connector oxidized

Sat Apr 06, 2019 10:12 am

cadmium plating? :shock: :)

andrum99
Posts: 772
Joined: Fri Jul 20, 2012 2:41 pm

Re: AV Connector oxidized

Sat Apr 06, 2019 5:56 pm

Milliways wrote:
Sat Apr 06, 2019 3:52 am
It isn't "corrosion" it is oxidation of the cadmium plating, and is quite normal (and harmless).

If you use it it should work, but attempting to "clean" is likely to do more harm than good.
Corrosion *is* oxidation. And after some googling, I'm rather surprised to find that it is still legal to use cadmium in electronic products, as long as it is below 0.01% or 100ppm by weight. Cadmium is certainly *not* harmless.
Last edited by andrum99 on Mon Apr 08, 2019 7:58 am, edited 1 time in total.

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Burngate
Posts: 5967
Joined: Thu Sep 29, 2011 4:34 pm
Location: Berkshire UK Tralfamadore
Contact: Website

Re: AV Connector oxidized

Sat Apr 06, 2019 6:22 pm

For some reason, I thought it was silver rather than cadmium.

Milliways
Posts: 432
Joined: Fri Apr 25, 2014 12:18 am
Location: Sydney, Australia

Re: AV Connector oxidized

Sat Apr 06, 2019 11:33 pm

Burngate wrote:
Sat Apr 06, 2019 6:22 pm
For some reason, I thought it was silver rather than cadmium.
On reflection, it probably is - the fact remains the discolouration (which is common) does not seem to affect performance, and does not warrant drastic removal action. Simply inserting and removing a plug should be sufficient.

andrum99
Posts: 772
Joined: Fri Jul 20, 2012 2:41 pm

Re: AV Connector oxidized

Mon Apr 08, 2019 7:58 am

I'm hoping it is silver. I don't know what cadmium oxidation looks like, but it does look like silver tarnishing. I'm going to go with silver :D

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Imperf3kt
Posts: 2631
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: AV Connector oxidized

Mon Apr 08, 2019 8:53 am

andrum99 wrote:
Mon Apr 08, 2019 7:58 am
I'm hoping it is silver. I don't know what cadmium oxidation looks like, but it does look like silver tarnishing. I'm going to go with silver :D
I believe, like the other ports on the Pi, it is just steel.
55:55:44:44:4C
52:4C:52:42:41

Heater
Posts: 13064
Joined: Tue Jul 17, 2012 3:02 pm

Re: AV Connector oxidized

Mon Apr 08, 2019 8:56 am

If it were regular steel it would rust. It for sure is not stainless steel.

It may well be steel but plated with something. And what that is is the question here.

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Burngate
Posts: 5967
Joined: Thu Sep 29, 2011 4:34 pm
Location: Berkshire UK Tralfamadore
Contact: Website

Re: AV Connector oxidized

Mon Apr 08, 2019 9:30 am

Probably spring steel coated with silver.

When I was in OBs, we had a rather large number of ¼" jacks - 19" racks full of them.
As you can imagine, the first week in June on the Epsom Downs is not famous for its weather, and anything that could corrode would.

The jack plugs were I believe brass which got cleaned with wire wool. The sockets were cleaned with a plug-shaped device that was mildly abrasive.

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