68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.
P200 Battery leaked
Posted by: molair on 2018-03-03 10:21:19
Hello everyone, this is my first post on this forum.

I recently recovered a Performa 200, at power up the screen was displaying tapes. I dismounted the Mac to see if capacitors had leaked.
And when I took out the motherboard, I saw that in addition to the capacitors, the battery of the PRAM had also leaked.

The problem is that the battery leaking has unsoldered components and chip pins:

- PRAM battery holder
- the components C79, L4
- Some pins of U20 and U21 components

The motherboard is not cleaned yet, but I have the impression that no track is cut, against round end tracks are very corroded.

I have several questions.
What is the L4 component?
I colored in orange the location of the leak. Do you think other components have been affected, such as Y1 or CTSS 197-0512?
Sorry for my English.
thank you,

Damien

photo1.png

zoom1.jpg

zoom2.jpg
Posted by: techknight on 2018-03-03 12:36:47
there are tons and tons of vias and traces that are just gone. gone gone... beyond economical repair, Unless Bolle wants to take it on, he may be able to fix it. 
Posted by: MOS8_030 on 2018-03-03 13:21:18
Howdy!

I would have to agree with TechKnight, it would take a lot of time and highly skilled labor to repair that board. 🙁

Posted by: Bolle on 2018-03-04 00:57:27
As techknight said there are a few broken traces (or vias that is)

This looks like it is fixable with some time and patience (and maybe the schematics, if you don‘t feel like guessing some of the connections)

It should be mostly traces to the ROM running along there - the two 245s might be buffering the data lines to the RAM, a few broken traces there as well.

Also there might be more damage under those ROM IC sockets.

The corroded solder spots all over the places also need reworking.

If you‘re up to the challenge I would start by checking all address and data lines between CPU, ROM and RAM (muxes and buffers where they don‘t connect directly to the SIMMs)

Techknight was hinting at me as I have recently done something similar on a SE/30 board:
Posted by: molair on 2018-03-04 03:42:07
Thank you for your answers.
I don't think I have the skills to repair this machine. I think I'll give it for parts.
1