LC III Chimes of Death

[fyndr]

I was trying out different SCSI configurations for an external HD when I noticed my LC III started giving the chimes of death immediately after startup. I can't see anything on the monitor, possibly because it is using an adapter, so I can't tell what specific error is occurring. I tried disconnecting all of the external cables except for power, removed the hard drive and extra RAM stick (tried disconnecting the floppy drive too but it's in fairly tight) but the issue still persists.

Any idea as to what's causing the issue or why it came on so suddenly? I'm fairly sure the board was recapped during its lifetime before I received it, but is there a way to know for sure if something like that is the culprit?

 

[uniserver]

lets see a picture i will tell you if its been capped or not... i doubt it has been re-capped by what its doing.

 

[fyndr]

Here are some pictures of the board. If they're not sufficient, please let me know and I can try taking more photos.

http://imgur.com/a/uaju9

The board appears to be intact, but I'm far from an electronics expert and wouldn't know what to look for in terms of something being wrong unless it was obvious to a layperson. Everything has been removed as stated previously except I reinstalled the RAM stick for these photos. The battery is a new one that I got about a month ago. Otherwise, no internal hardware changes have been made.

 

[uniserver]

The caps are Orginal and have leaked and have been leaking for quite some time as pads are corroded up

 

[MJ313]

Look at U5 in your first pic (upper left corner)... it's pads and legs are being chewed up nomnomnom

 

[fyndr]

Well that's no good. What can be done for the board apart from replacing the caps? Are any of the fixes time sensitive?

 

[MJ313]

Well, ideally, you'd remove the caps, thoroughly wash, thoroughly dry and then recap the board. If you aren't going to recap it right now, you should still thoroughly wash and thoroughly dry it to get as much cap goo off as possible.

If you want to recap it but don't want to do it yourself, some people on here could do it for you. Uniserver's real modest and he wouldn't say it but he could probably do an LCIII blindfolded at this point.

 

[fyndr]

Yeah I've heard good things, sent an e-mail so we'll see how the board fares.

 

[djhaloeight]

Uniserver is the MAN when it comes to recapping vintage Macs I had him do my LC III+ board and power supply as preventative maintenance

 

[uniserver]

pretty sure this is the one i completed last night.  it works great.

 

[fyndr]

Received the recapped LC III, it's back in proper working order. Thanks!

 

[primustimus]

I just found this post, as I just tried starting up my LCIII, only to get the chimes of death. I haven't taken the board out yet, but I'm assuming it probably needs a recap. I'm comfortable recapping myself, as I have a bunch of soldering experience, but want to make sure I get the proper replacement caps. Would you be able to direct me to the right place and specs?

Thanks in advance!

 

[cheesestraws]

Would you be able to direct me to the right place and specs?

(In general, you are likely to get better results by creating a new thread for a new question, rather than necromancing an old one...)

This is the guide I used:

http://www.maccaps.com/MacCaps/Capacitor_Reference/Entries/1993/2/10_Macintosh_LC_III.html

The precise model numbers I used:

• TAJB107K006TNJ - 100 µF, 6.3V
  
• T491C476K016AT - 47 µF, 16V
  
• T491B106K016AT - 10 µF, 16V
  

 

[primustimus]

Thanks so much. Yes, you are probably right. This is actually my first post here. 

That was really helpful. I'll look into sourcing them here in Canada. Probably will go DigiKey I think.

 

[cheesestraws]

This is actually my first post here. 

I meant to say "welcome to the forum!" but somehow it didn't actually make it into the reply .  But a belated welcome anyway.

I'll look into sourcing them here in Canada

For what it's worth, I worked out what to get by looking at recapamac.com.au then getting ones with the same basic properties but one physical case size down from what he recommended, because I'm not as good at soldering as he is, and I couldn't get the bigger ones to reliably go on .