You need to scrape the solder mask loose where the corrosion has gotten underneath. I show how to do this in several of my M100 videos.
Jeff From: M100 <[email protected]> On Behalf Of AvantGuard Systems Sent: Wednesday, February 10, 2021 10:57 AM To: [email protected] Subject: Re: [M100] Newbie The link is to a pic of the backside of the board after cleaning. I was expecting a greater difference. Should I be concerned? https://photos.app.goo.gl/HPoA24GYueEJKucw9 On Wed, Feb 10, 2021, 05:23 AvantGuard Systems <[email protected] <mailto:[email protected]> > wrote: As an update after day 1 of working the bottom of the board (since there's nothing in the way there and it would be easier) with a white vinegar / vegetable glycerin 50/50 solution, it was sticky afterwards. I'm continuing to work it more today, but didn't expect it to get sticky. Curtis On Tue, Feb 9, 2021 at 1:02 PM AvantGuard Systems <[email protected] <mailto:[email protected]> > wrote: Thanks Ron, I saw one post saying you can soak boards in a vinegar solution. Not sure I want to do that, but is that possible? Curtis On Tue, Feb 9, 2021 at 12:32 PM Ron Lauzon <[email protected] <mailto:[email protected]> > wrote: Vinegar. You will find many videos about cleaning up leaking batteries on YouTube. This is a common problem with vintage computers. -- Weblog: http://ronsapartment.blogspot.com/ TRS-80 Pocket Computer 2 - TRS-80 Pocket Computer 4 - TRS-80 Model 100/102 - Tandy 1100FD - Tandy 1400LT - Commodore 64 - TRS-80 Model 4P - Kaypro IV - Commodore PET RC2014 (Mini, Zed and Pro) - Altair-Duino with TI Silent 700 - VT320 terminal/Raspberry Pi 0 Some people like to work on old cars. But old computers are cheaper and don't require a big garage. Feb 9, 2021, 15:26 by [email protected] <mailto:[email protected]> : Just joined the list as I just acquired a used TRS80 Model 100. Of course it's not working, so I just wanted to first ask for some advice. I have been reading info at Club100. Basically, I feel I need to buy some stuff at Club100. First and foremost a new battery, which is highly recommended. Also expansion RAM (since none has been installed), probably the power supply (although maybe premature). But probably better cost wise to get everything right away (shipping costs!). Anyhow, opening it up though I see that this thing obviously had batteries left in it and there is dry acid (whatever that is) about that general area on the board. My concern is that that might be enough damage that there's no way to recover it. Or maybe cleaning that area up might be fine. What is recommended for cleaning up battery acid, btw. Thanks for any suggestions! Curtis
