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Old 11th January 2013, 09:31 AM   #11
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by madtecchy View Post
Hi Mooly LoL. Ever remember those little sticky dots of aluminium foil that could be stuck to the rubber contacts whos resistance had increased ..
I remember the special kits you could get of a conductive coating you could use to retreat the pads... limited durability I found. Don't recall aluminium foil dots tbh.

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Originally Posted by sattwa View Post
Click the image to open in full size.
Click the image to open in full size.

this is what the PCB looks like
it seems fine to me, connections to the battery are quite solid and there are no traces of rust, anyway I will clean it with some isopropanole
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Old 11th January 2013, 09:31 AM   #12
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Just a thought . ir remote controls send out pulses is the fluke 177 DVM able to measure fast enough to give a true readin ???
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Old 11th January 2013, 09:46 AM   #13
sattwa is offline sattwa  Italy
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images edited
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Old 11th January 2013, 10:30 AM   #14
sattwa is offline sattwa  Italy
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just a question, it could be a silly one as I am not an expert.
If a measure the resistance between the remote connections for the battery (without the battery and without pressing any button), shouldn't I measure an infinite resistance?
to my test resistance is about 250 kohm..
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Old 11th January 2013, 10:46 AM   #15
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Your measuring across the circuit which will read as a resistance. Just because it shouldn't draw any current, it doesn't mean it will read open circuit. There will be an electrolytic cap across the supply for one thing and the various semiconductor junctions will read too.

So its normal to read something.
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Old 11th January 2013, 10:49 AM   #16
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Looking at the pics... that board will wash. Use fairly hot water and a tiny drop of detergent and a soft brush. Rinse and dry with paper towel. If the big IC is in a socket ? Then carefully remove it and dry around the pins of the socket. The IC can be washed too to rid it of any contamination. Also wash the rubber keypad.
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Old 11th January 2013, 11:28 AM   #17
sattwa is offline sattwa  Italy
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OK Mooly, sorry for the silly question, I saw it as a simple citcuit that would close only by pressing a button, i did not consider the power supplu and other more complex components..
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Old 11th January 2013, 11:32 AM   #18
sattwa is offline sattwa  Italy
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as for the cleaning, wouldn't isopropilic alcohol be more indicated? I thought this was the solvent tipically used to clean electronic components
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Old 11th January 2013, 12:01 PM   #19
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I've found you can't beat water and detergent or foam cleaner and water. Don't be afraid of wetting it. Pour some detergent on the PCB, driop some water on it and use a soft brush. Then rinse well using the brush.

I've washed countless remotes and many many whole PCB's from TV's VCR etc etc. Just make sure its totally dry before you put the battery back. Put it on a radiator to dry.
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Old 11th January 2013, 12:31 PM   #20
sattwa is offline sattwa  Italy
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Great, I have already cleaned it with water and soap. there was some dirt between solderings, I wonder if this could cause some courrent leakage..
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