Need Macintosh LC help! (giving no startup bong)

[JRL]

Alright, I was using my Macintosh LC when suddenly the monitor's image stretched and it immediately showed a grey screen. I had no choice but to turn on and off again.

When I restarted, there was no startup bong/HD activity and no image. :'(

can somebody help?

BTW: the PSU powered on the Macintosh LC; it didn't click. Also, the the battery isn't too old; maybe several years or so.

 

[QuadSix50]

Have you tried on another monitor? What about the caps in the LC? Do they look OK?

 

[Byrd]

Have you tried the old "jumpstart" on-off-on in quick succession?

JB

 

[JRL]

Thanks everybody for the suggestions; I'll try them later after I let the Macintosh LC sit for a while.

However, I'm suspecting it's the PSU. D: It can't be the monitor, as the hard drive doesn't spin up.

 

[QuadSix50]

Thanks everybody for the suggestions; I'll try them later after I let the Macintosh LC sit for a while.
However, I'm suspecting it's the PSU. D: It can't be the monitor, as the hard drive doesn't spin up.

Sounds like you might have to try what Byrd said. I tried that once with the LC II we've talked about, but it didn't work. I just left it on and plugged in for a while until it actually booted up on its own. It seems that it doesn't like to be out of power for very long periods of time (I'm talking like months).

 

[JRL]

Also, this would help, right?

My Macintosh LC is the same apparent pre-production Macintosh LC as shown here;

http://www.fenestrated.net/~macman/

There is also a giant surface mount cap that has been leaking cap fluid on one of the chips. D: (not all over; just at one area)

 

[Franklinstein]

In my experience, the LC doesn't respond to bumping; the LC II doesn't require it, either. On that note, the Classic and Classic II don't use it, either. I don't remember about any of the Mac II series, but they were soft-power so they either wouldn't boot period without a good PRAM battery, or would work without issue.

If an LC won't show signs of life, it could have a bad power supply. The voltages may be listed on the power supply's casing, so with a voltmeter it could be tested.

My Macintosh LC is the same apparent pre-production Macintosh LC as shown here;
http://www.fenestrated.net/~macman/

I've got a preproduction model, myself. Mine has a very large radial-lead capacitor soldered to the board (as opposed to surface-mounted) and then hot-glued to the top of the SCSI chip; it also has windowed EEPROMs marked "Apple Confidential" in place of the normal ROM chips. I bought it at a thrift store in Oregon maybe six years ago, along with an FDHD-upgraded Mac II. Too bad I didn't also buy that boxed Laser 128 (which, I found out later, was an Apple II clone) that I saw there later on... I'll upload a picture of the LC's logic board when I find it.

 

[JRL]

Whoops; I thought that the hot glue was cap leakage. xD It is hot glue on mine too.

There is also a red CUDA button (unlike the normal LC's, as you might know); would that help?

I will definetly replace the PSU. It does turn on; it's just that it won't spin up a HD/give off a display/startup chime.

 

[JRL]

After working for a bit, it isn't again.

It seems like it's the logic board's fault. Does anybody have a cheap Macintosh LC motherboard they can sell me for cheap?

 

[Unknown_K]

Why not just recap the motherboard? I can do it for $20 plus parts and you play shipping both ways. Any replacement boards you get are going to do the same thing because of age. I have a recapped LC3 on the shelf but you need a LC2 correct?

 

[JRL]

Well, I really don't have any time, as much as I'd like to do it myself.

I need a Macintosh LC board but if I can't find one, a Macintosh LC II or even maybe a LC III board would work, I guess. Still want to keep it stock though.