I think I still have my logic board.
Gary
> On Apr 29, 2017, at 6:57 AM, Joe Hetrick <jhetrick@bitjanitor.net> wrote:
>
> I replaced the harness initially; but the reality is after having it more
> fully apart, it probably needs a new logic board. The damage from the
> battery corrosion is significant and probably covers 75-85% of the board.
> Most of the IC's legs appear to have corrosion between them, and I do no
> relish cleaning the corrosion and then trying to replace components whose
> legs are corroded away after. Suddenly it becomes quite a task.
>
> I spent some time last evening cleaning traces on the LB and found at least a
> half a dozen components that are far enough gone (mostly resistors, but at
> least 2 16 pin IC's) that they'd need to be replaced. I see no sense in
> cleaning the board up and leaving those components in place, in most cases
> the worst ones are components who have corrosion underneath them.
>
> The time and expense at this point are discouraging. I think the most
> logical thing at this point is to part out and offer up the functioning parts
> of the unit (which..is everything minus the logic board).
>
> So, thanks to everyone for their advice. A lesson was learned in the end,
> so, as always there are silver linings.
>
>
> 73
> Joe KC0VKN
>
>
> On 27 Apr 13:32, Stuart Rohre wrote:
>> very likely the measurement of a fully charged battery after a day
>> or so, means the battery recharger is working.
>>
>> You do not mention if you removed the corrosion from all the battery
>> contacts and IN BETWEEN THE TRACES OF THE PCB.
>>
>> Likely you have conductive compounds on the PCB that are causing
>> current to flow all the time from the battery to other circuits
>> besides the memory keep alive bus. You may also have a bad
>> electrolytic on that bus.
>>
>> Keep looking for such problems and you should be able to find the leaks.
>> Does your DVM also measure small current values? That could be helpful.
>>
>> I use baking soda to neutralize acid stains, vinegar to neutralize
>> alkaline battery spills, and rubbing alcohol and distilled water, to
>> clean things up, (clear type ALcohol only).
>>
>> Good lUck,
>> Stuart Rohre
>> K5KVH
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