English Amiga Board


Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 16 July 2016, 16:55   #1
Hombre40
Registered User

 
Join Date: Feb 2016
Location: Roma
Posts: 12
A500Plus battery leaked?

Hi all,
today I retrieved my old A500Plus from the cellar. It looks mostly ok, but I opened it and I can see blackish lines around the battery. I guess these are the dreaded leaks? How bad it is? Is there any chance I can fix it and have it boot again? (I did not try connecting power to avoid further damage).

Photo to be published as soon as my Internet connection works better

Last edited by Hombre40; 16 July 2016 at 18:27.
Hombre40 is offline  
Old 17 July 2016, 02:52   #2
prowler
Global Moderator

prowler's Avatar
 
Join Date: Aug 2008
Location: Sidcup, England
Posts: 10,300
This is a common problem with the A500 Plus after all these years, but the damage to yours sounds minimal, fortunately.

The best thing you can do is to remove the battery as soon as possible - preferably by cutting the legs, being careful not to inflict any damage on the circuit board tracks.

If you can do so, it is also important to remove any corrosive deposits you may find once you have removed the battery.

In your case, it may be sufficient just to clean the area surrounding the battery with isopropyl alcohol (IPA), applied with a clean 12mm paint brush with the bristles cut short (to around 8mm) to improve the rubbing action.

If you see any green or white crystalline deposits, then the board will need removing from the case and irrigating with lemon juice while brushing to remove the deposits and then flushing with tap water before drying thoroughly.

The battery will not need to be replaced, unless the real time clock function is important to you, because that's the only reason it is there.
prowler is offline  
Old 17 July 2016, 09:59   #3
Hombre40
Registered User

 
Join Date: Feb 2016
Location: Roma
Posts: 12
So what would those blackened copper lines be? I'm trying to underastand what happens. Like, the battery leaks corrode the coating layer put over the copper lines to avoid oxidation, so the copper oxidates, and it just needs to be cleaned to remove the oxidated layers. Or do the leaks directly corrode the copper?

Yes I don't need the battery really... I could survive without the RTC.

If I need to wash the board, can I leave the chips in and just wait for the board to dry completely (say, 3 days), or should I desolder and remove socketed chips?


My internet connection still is not working properly, sorry...
Hombre40 is offline  
Old 17 July 2016, 10:25   #4
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,294
The electrolyte will always seep under the solder mask from some spot. First the traces start to change colour, but after a longer period they disintegrate entirely. If there are no functional issues yet, it is usually enough to neutralize the electrolyte and thoroughly clean the board.

For cleaning, it is a good idea to remove the socketed chips, but you don't need to start desoldering anything. Just be sure to use something like distilled water or isopropyl alcohol for the final rinse, anything that won't leave mineral deposits behind when drying.
ajk is offline  
Old 17 July 2016, 12:50   #5
djukon
Registered User
 
Join Date: Apr 2010
Location: Portugal
Posts: 138
Hi, I also have to clean up my A500 Plus and I have some questions.

So, to recap: brush with isopropyl alcohol, irrigate (soak?) with light acid (lemon juice or vinegar), rinse with isopropyl alcohol or distilled water, let it dry thoroughly. I read vinegar as an alternative to lemon juice in another thread.

Quote:
Originally Posted by prowler View Post
clean the area surrounding the battery with isopropyl alcohol (IPA)
I don't have IPA currently, I can only get some next Saturday. At least I think I don't, I do have a floppy drive cleaning liquid that came with a cleaning floppy, which doesn't say IPA on the label. It could be IPA, what else could it be besides it?

Quote:
Originally Posted by prowler View Post
irrigating with lemon juice while brushing to remove the deposits
Quote:
Originally Posted by ajk View Post
The electrolyte will always seep under the solder mask from some spot.
Generously letting lemon juice or vinegar bathe the affected part of the board? Or doing it cautiously with small drops and cotton swabs so it doesn't get out of hand?

Should one brush the area during this phase, or just let lemon juice or vinegar seep in and let the acid neutralize the alkali? If one is to brush, with what then? Another clean paint brush?

Quote:
Originally Posted by ajk View Post
For cleaning, it is a good idea to remove the socketed chips,
Why? Is one supposed to bathe the entire board or a large part of it? Or just to be cautious in case a drop of acid jumps to the wrong place while cleaning the RTC area? Or is it because some electrical discharge could happen during the repair?

Quote:
Originally Posted by prowler View Post
and then flushing with tap water
Quote:
Originally Posted by ajk View Post
Just be sure to use something like distilled water or isopropyl alcohol for the final rinse, anything that won't leave mineral deposits behind when drying.
Generously letting distilled water or IPA go through the affected part of the board (one side to the other)? As to remove all traces of lemon juice or vinegar (as well as the neutralized alkali)?

On a side note, prowler, I don't think tap water is such a good idea as it contains many mineral deposits that when dry could cause electrical current to flow through the wrong places.

Quote:
Originally Posted by prowler View Post
drying thoroughly.
Soak up the liquid with some sort of cloth first, then apply a hair dryer with the heat turned off for 30 minutes? And then wait a week in a dry place? Add some rice in contact with the affected area as well during the drying week?

Quote:
Originally Posted by prowler View Post
The battery will not need to be replaced, unless the real time clock function is important to you, because that's the only reason it is there.
I will need it, but I haven't got it working since it came back from a very simple repair 6 or more years ago. The coin battery replacement must have been soldered in incorrectly or something. Is there a guide how to properly connect one? I once saw one online, like 10 years ago, unfortunately I can't find it anymore.
djukon is offline  
Old 17 July 2016, 13:09   #6
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,294
@djukon

Wash a generous area around the visible corrosion. No harm in cleaning the whole board. Vinegar and citric acid won't attack the intact parts (obviously don't leave the board sitting in vinegar for weeks or something ridiculous like that).

Removing the socketed chips simply gives you better access for cleaning (and later, drying). Also a good time to check if the sockets or the pins have been affected by corrosion.

Getting rid of excess moisture in some way (dabbing with paper towels, canned air, compressor) is a good idea, particularly from inside the sockets, connectors etc. where water can't easily drain out. Then just let the board dry naturally, preferably standing up on its side. The remaining moisture will be gone within a day, assuming you don't live in a jungle
ajk is offline  
Old 17 July 2016, 13:29   #7
djukon
Registered User
 
Join Date: Apr 2010
Location: Portugal
Posts: 138
Quote:
Originally Posted by ajk View Post
@djukon [...]
Thanks for the tips, ajk. I don't feel comfortable washing the entire board in vinegar, yet. But I will check the sockets and pins.
djukon is offline  
Old 17 July 2016, 16:07   #8
idrougge
Registered User
 
Join Date: Sep 2007
Location: Stockholm
Posts: 3,929
Washing in vinegar is potentially harmful if you can't clean up the spot. Soaking an entire board in vinegar is bordering on stupidity.
idrougge is offline  
Old 17 July 2016, 17:18   #9
djukon
Registered User
 
Join Date: Apr 2010
Location: Portugal
Posts: 138
Quote:
Originally Posted by idrougge View Post
Washing in vinegar is potentially harmful if you can't clean up the spot. Soaking an entire board in vinegar is bordering on stupidity.
Exactly, idrougge. I've got to study this topic better and figure out where and how best to apply (and remove) it. But currently I'm going for "if it ain't broke, don't fix it" approach and just stick to the RTC area, and connectors overall. These boards have gone production extinct, so one needs to be careful.
djukon is offline  
Old 18 July 2016, 12:00   #10
Hombre40
Registered User

 
Join Date: Feb 2016
Location: Roma
Posts: 12
Finally, I managed to upload the picture.


How bad is it?
Hombre40 is offline  
Old 18 July 2016, 12:16   #11
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,294
That is "medium" bad. Clearly the battery has leaked a lot, but it doesn't look like it has reached most of the chips at all. There may be some damage to the traces, some of them have blackened. Brush away the loose crystals with a toothbrush or such, carefully clip the battery off, and take another photo.
ajk is offline  
Old 19 July 2016, 03:08   #12
idrougge
Registered User
 
Join Date: Sep 2007
Location: Stockholm
Posts: 3,929
Not that bad, but the axial capacitor needs replacing or at least a thorough cleaning (including preferably desoldering), as do some vias. I recommend cleaning any smeared solder points with the aforementioned fluids, followed by flux and fresh solder.
idrougge is offline  
Old 19 July 2016, 05:04   #13
dlfrsilver
CaptainM68K-SPS France
dlfrsilver's Avatar
 
Join Date: Dec 2004
Location: Melun nearby Paris/France
Age: 42
Posts: 8,310
Send a message via MSN to dlfrsilver
Yes desoldering the battery from the MB, use some vinegar on a cotoon, and brush brush

Next, you need some kynar wire (bit of soldering) to bridge the eaten traces darkened in in black.
dlfrsilver is offline  
Old 19 July 2016, 11:58   #14
amigakit.com
Registered User

amigakit.com's Avatar
 
Join Date: Aug 2004
Location: www.amigakit.com
Posts: 1,841
After checking the via's and tracks, a good option to replace the old Nicad battery is a coin cell battery:

amigakit.com is online now  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
A500Plus with 3Mb chip.... Fendrix support.Hardware 4 04 August 2015 00:05
A500plus - warranty seals intact... chiark support.Hardware 39 28 November 2008 19:23
What leaked and killed my A2000? rlcarr support.Hardware 4 20 April 2008 23:07
Amiga 3000 issues - Leaked battery havoc coze support.Hardware 9 18 October 2006 14:11
Yes its another battery leaked A500+ chaoticjelly support.Hardware 3 03 July 2006 15:18

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 16:10.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Page generated in 0.09256 seconds with 13 queries