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Wasmachinemann-NL is offline Wasmachinemann-NL
2014-03-22 , 21:33
Posts: 388 | Thanked: 1,097 times | Joined on Aug 2011 @ Netherlands
#1
One of my N900s have a few non-working keys, the Sym/Ctrl, the key beneath it and the Shift key, the T key and the Up and Right arrow key are dead, what could this be? I know it's HW related.
 
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2014-03-22 , 22:39
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#2
screw it open, and see if the 'dome sheet' is ok.

Also: Are you sure you didn't threw it in the washing machine? hehe
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Wasmachinemann-NL is offline Wasmachinemann-NL
2014-03-23 , 07:58
Posts: 388 | Thanked: 1,097 times | Joined on Aug 2011 @ Netherlands
#3
Originally Posted by HtheB View Post
screw it open, and see if the 'dome sheet' is ok.

Also: Are you sure you didn't threw it in the washing machine? hehe
It had a small ingress of clean bath water once, but I did the right thing and removed the battery immidately after that and let it dry, it worked a few months after that but then suddenly my KB died partially.
 
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2014-03-23 , 10:18
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#4
Do the affected keys click when pressed? If yes, then it might not be the dome sheet but rather corroded contacts under it, possibly even caused by that immersion in the bath. It is easy to assume that the water started seeping in from the edges and the affected keys is as far as it got before you pulled out. The best way to find out is to open the phone and see.
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Wasmachinemann-NL's Avatar
Wasmachinemann-NL is offline Wasmachinemann-NL
2014-03-23 , 15:14
Posts: 388 | Thanked: 1,097 times | Joined on Aug 2011 @ Netherlands
#5
Originally Posted by pichlo View Post
Do the affected keys click when pressed? If yes, then it might not be the dome sheet but rather corroded contacts under it, possibly even caused by that immersion in the bath. It is easy to assume that the water started seeping in from the edges and the affected keys is as far as it got before you pulled out. The best way to find out is to open the phone and see.
So I can just remove the dome sheet without tearing it then?


EDIT: Removed it, cleaned with nail polish remover, didn't help :c
Last edited by Wasmachinemann-NL; 2014-03-23 at 15:23.
 
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peterleinchen is offline peterleinchen
2014-03-23 , 16:42
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#6
Originally Posted by Wasmachinemann-NL View Post
EDIT: Removed it, cleaned with nail polish remover didn't help :c
Ouch, nail polish remover?
Only use clean (medicine or pure) alcohol, e.g. from drug store (pharmacy).
And you should have done immediately after that incident. Now corrosion may have fulfilled its destructive irreversible work.

So if water comes to device:
pull battery immediately, open up device (always), check for water and clean with alcohol (take care of camera module), let it dry (do NOT use hair dryer) upright so water can rinse, maybe put it into closable box with silica gel or rice to let it dry for at least 24h (better 48h) and only after that power on again.
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Wasmachinemann-NL is offline Wasmachinemann-NL
2014-03-23 , 18:38
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#7
Originally Posted by peterleinchen View Post
Ouch, nail polish remover?
Only use clean (medicine or pure) alcohol, e.g. from drug store (pharmacy).
And you should have done immediately after that incident. Now corrosion may have fulfilled its destructive irreversible work.

So if water comes to device:
pull battery immediately, open up device (always), check for water and clean with alcohol (take care of camera module), let it dry (do NOT use hair dryer) upright so water can rinse, maybe put it into closable box with silica gel or rice to let it dry for at least 24h (better 48h) and only after that power on again.
I put it on a hot radiator, worked fine afterward, but for the record: it's not a daily driver so I don't really care for it anymore, it's going on my bike as a computer+GPS later.
 
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peterleinchen is offline peterleinchen
2014-03-23 , 18:44
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#8
Originally Posted by Wasmachinemann-NL View Post
I put it on a hot radiator
Also just for the record:
a 'warm' and more important a dry place is fine.
Hair dryers and/or "hot" radiators will produce too much heat and a lot of moisture. So sometimes a bit less is much more.

And the 'bad' result may come up oonly after a few weeks/months.
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Wasmachinemann-NL is offline Wasmachinemann-NL
2014-03-23 , 18:54
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#9
Originally Posted by peterleinchen View Post
Also just for the record:
a 'warm' and more important a dry place is fine.
Hair dryers and/or "hot" radiators will produce too much heat and a lot of moisture. So sometimes a bit less is much more.

And the 'bad' result may come up oonly after a few weeks/months.
Well, whatever your idea of hot is, how about lukewarm? don't remember properly.
 
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2014-03-23 , 20:58
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#10
Originally Posted by peterleinchen View Post
Ouch, nail polish remover?
Only use clean (medicine or pure) alcohol, e.g. from drug store (pharmacy).
Beter still, isopropyl alcohol. That's the stuff they use in CD/DVD lens cleaners... or indeed... <gasp>... some nail polish removers But be careful, some removers use acetone, which is a different beast, aggressive to most plastics as well as PCB protective masks. The smell should give it away.

Originally Posted by Wasmachinemann-NL View Post
Well, whatever your idea of hot is, how about lukewarm? don't remember properly.
A rule of thumb, if it is too hot for you to hold it, it is probably too hot.
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