EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: ZedRedLed on March 27, 2018, 04:57:41 pm
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Hi, I am trying to fix a Madcatz V7 Keyboard after a tea spillage and so far I was relatively successful.
I replaced some diodes and redid some of the traces with conductive silver ink. After that it worked fine, however, after a couple days I started having strange crosstalk between some of the keys, with some not even working at all anymore.
I thought this could be due to me having slightly bent the membrane or it shifting around so I tried securing it, but this only made a small difference. Also, it sometimes works for a couple seconds before the problems occur and briefly unplugging the keyboard seems to 'reset' the issue.
Any idea what this could be?
Thanks in advance!
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Hi!
From my experience that type of problem when some device is spilled with conducting fluid like in your case the water, that is in high percentage not repairable.
Tha major problem is with the micro dirt in this case the water what is leftover on the whole pcb, board, unit whatever.
Even of deep cleaning will not help.
After a while there will build up some crossing area and that will brake traces, connect traces with each other where the corrosion act as a resistor....
So. I realli wish you will come over your problem and I hope you will luckily repair your keyboard, but I don't have to much faith in...
Try to clean the best you can.
Tray to identify corrosion points, most of time between legs of ic's.
Check for jumper corrosion between traces etc...
My best wish!
Sent from my GT-I8260 using Tapatalk
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Hi, thanks for the kind response!
I'll give cleaning it another try, but I wonder, Is this something that I can measure with a multimeter? Because I tried to locate crossovers with the continuity tester and I couldn't find any, apart from actual traces on the membrane. This is why I thought that maybe the membrane is bent in a way that makes multiple buttons be pressed at the same time
Also, I found another component that looks slightly corroded, but what is it? I don't have so much experience yet, I think it's a diode but I'm not familiar with what type looks like this. (Sorry for the bad picture quality)
https://imgur.com/a/R5qMH
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Ok nevermind, I did some googling and I'm pretty sure it is a ferrite bead.
How can I test if it is broken?
On one side there was a little bit of corrosion, but does this mean the bead is damaged and could a damaged bead be causing my problems?
It is located near the diodes coming from the top membrane traces