leaking memory backup cells was"Re: [Kenwood] TS-850 Display Gone Wild"

[Clif Holland]

I'm not a chemist, just saying what has worked for me. If anyone has better 
ideas I'm listening. I don't know what the chemical(s) is(are) in a Li-Ion 
battery and what would neutralize it properly without damage to the PCB. I 
know you don't want alcohol on the faceplate, it takes off the paint(?) and 
leaves it bright and shiny black.

I use alcohol to flush it thoroughly and it dries with zero residue.

Clif Holland KA5IPF
www.avvid.com




----- Original Message ----- 
From: "Avi - Modi'im Orchards" <tiavi at netvision.net.il>
To: <kenwood at mailman.qth.net>
Sent: Tuesday, December 18, 2007 1:22 PM
Subject: leaking memory backup cells was"Re: [Kenwood] TS-850 Display Gone 
Wild"


> The two answers I got are a bit different. Clif at Avvid suggests 100% 
> denatured alcohol, and Ken KD0AGV suggests baking soda (and BTW warns NOT 
> to use alcohol - I would gues this is dependant on the kind of alcohol and 
> the material from which the substrate of the circuit board is made).
>
> The first answer implies that the pollutants released from a leaking 
> button cell are basically organic compounds that need a solvent to be 
> removed, the second that they are acidic and need to be neutralized by a 
> base. Sometimes the salts that are formed in these acid-base reactions can 
> have their own negative effects, too. Are there any chemists on the list 
> who can enlighten us as to what the nature is of the stuff leaking from a 
> spent button cell, how they would handle the cleanup without endangering 
> the copper traces or circuit board substrate or plastic housings of 
> adjacent components, and BTW if there are any health hazards involved?
>
> -avi 4X6UA
>
> P.S. - i'm purposely leaving the chain of messages below because I changed 
> the subject header.
>
> ----- Original Message ----- 
> From: "Avi - Modi'im Orchards" <tiavi at netvision.net.il>
> To: "Clif Holland" <clif at avvid.com>; <kenwood at mailman.qth.net>
> Sent: Tuesday, December 18, 2007 09:03
> Subject: Re: [Kenwood] TS-850 Display Gone Wild
>
>
>> What technique or material do you recommend for removing and neutralizing 
>> the chemicals from battery leaks on PCBs?
>>
>> -avi 4X6UA
>>
>> ----- Original Message ----- 
>> From: "Clif Holland" <clif at avvid.com>
>> To: "Henry" <ka3muf at charter.net>; <kenwood at mailman.qth.net>
>> Sent: Tuesday, December 18, 2007 03:47
>> Subject: Re: [Kenwood] TS-850 Display Gone Wild
>>
>>
>>> You need to get your nose in the radio "RAT NOW", that's immediately for 
>>> those furthur north.
>>>
>>> Odds are pretty good the battery is leaking and there are data lines 
>>> under it that don't like battery acid. The longer you wait the more 
>>> damage.
>>>
>>> Remove the top and bottom.
>>> Remove the top screws on each side just behind the front panel. (2).
>>> The front will tilt over and the battery will be just to the left of 
>>> center on the board on the chassis.
>>> Look around it for any signs of white powder. Tilt the top of the 
>>> battery over and look behind it. Us a small flashlight. Any signs of 
>>> white power and it's leaking. Look closely at the seam on the back. Look 
>>> the entire board over carefully for any corrosion etc.
>>>
>>> That's the digital unit and they are no longer available so don't damage 
>>> it or you have a trotline weight.
>>>
>>> Clif Holland KA5IPF
>>> www.avvid.com
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Henry" <ka3muf at charter.net>
>>> To: <kenwood at mailman.qth.net>
>>> Sent: Monday, December 17, 2007 5:14 PM
>>> Subject: [Kenwood] TS-850 Display Gone Wild
>>>
>>>
>>>>I know that something about this problem has been posted previously but 
>>>>I
>>>> have been unable to locate it.  The radio still works and I have gotten 
>>>> it
>>>> to display the desired freq. on 75 meters but when it was first powered 
>>>> up
>>>> today, every item in the display was illuminated and nothing but 8s and
>>>> sometimes vertical lines were displayed in the frequency area.  Is my
>>>> internal battery going south or what?  I tried the hard reset which 
>>>> seemed
>>>> to work but the same erratic display appeared after turning the VFO.  A
>>>> little more patience and now the display seems to be stable.  I am 
>>>> however,
>>>> afraid to turn the radio off!  Is there a quick and easy fix for this? 
>>>> If
>>>> the battery needs replacing, can this be done by me with relative ease?
>>>> Something tells me the battery is well buried in the bowels of this 
>>>> great
>>>> radio!!
>>>>
>>>>
>>>>
>>>> This is my first posting here so hopefully no ones feathers are 
>>>> ruffled.
>>>>
>>>>
>>>>
>>>> Henry KK4HG
>>>>
>>>> 276-608-8750
>
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