| LC 550 issue, two chimes then boot. [message #12852] |
Thu, 16 August 2012 15:41  |
Matthew Gill
Messages: 3
Registered: August 2012
Karma: 0
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Junior Member |
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I've got an LC 550. When I first tries using it, it booted up just fine. I
don't recall how many times it chimed.
Then, after plugging it again some time after it would NOT turn on. I'd
hear the CRT make sound when you flipped the switch, but no power otherwise.
After letting it sit while plugged in overnight, it fired right up! It
chimed TWICE though, which is odd. I removed the logic board, checked the
caps (they all look GOOD) and put it back... again, chimed twice and booted
right up.
Any ideas? Could the logic board battery be dead, or maybe the power supply
has an issue?
Thanks!
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| RE: LC 550 issue, two chimes then boot. [message #12882 is a reply to message #12852] |
Thu, 16 August 2012 22:35  |
Jason Johnson
Messages: 131
Registered: August 2012
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Senior Member |
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Try replacing pram battery, the reset pram with com option p r at boot, all beige macs don't like dead pram batteries especially performas.
Good luck
Date: Thu, 16 Aug 2012 12:41:13 -0700
From: mgill355@gmail.com
To: vintage-macs@googlegroups.com
Subject: LC 550 issue, two chimes then boot.
I've got an LC 550. When I first tries using it, it booted up just fine. I don't recall how many times it chimed.
Then, after plugging it again some time after it would NOT turn on. I'd hear the CRT make sound when you flipped the switch, but no power otherwise.
After letting it sit while plugged in overnight, it fired right up! It chimed TWICE though, which is odd. I removed the logic board, checked the caps (they all look GOOD) and put it back... again, chimed twice and booted right up.
Any ideas? Could the logic board battery be dead, or maybe the power supply has an issue?
Thanks!
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| Re: LC 550 issue, two chimes then boot. [message #12933 is a reply to message #12882] |
Fri, 17 August 2012 08:14 |
Britt Dodd
Messages: 26
Registered: August 2012
Karma: 0
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Junior Member |
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My guess on that is that since the nvram is battery backed and the
PRAM battery is dead, that the mac chimes, recognizes that the nvram
doesn't contain anything but random garbage, and resets the PRAM
itself. Just a guess.
FWIW my 6116 will absolutely not boot without a functioning PRAM
battery unless I, standing on one foot, pressed the power button on
and off in quick succession to "charge" that nvram power circuit long
enough for it to do its thing. Its much easier to get a PRAM battery,
or solder those CR3026 battery holders in there (although 4.6V vs 3V
is a big difference)
On Thu, Aug 16, 2012 at 10:35 PM, Jason Johnson <havokalien@hotmail.com> wrote:
> Try replacing pram battery, the reset pram with com option p r at boot, all
> beige macs don't like dead pram batteries especially performas.
>
> Good luck
>
> ________________________________
> Date: Thu, 16 Aug 2012 12:41:13 -0700
> From: mgill355@gmail.com
> To: vintage-macs@googlegroups.com
> Subject: LC 550 issue, two chimes then boot.
>
>
> I've got an LC 550. When I first tries using it, it booted up just fine. I
> don't recall how many times it chimed.
>
> Then, after plugging it again some time after it would NOT turn on. I'd hear
> the CRT make sound when you flipped the switch, but no power otherwise.
>
> After letting it sit while plugged in overnight, it fired right up! It
> chimed TWICE though, which is odd. I removed the logic board, checked the
> caps (they all look GOOD) and put it back... again, chimed twice and booted
> right up.
>
> Any ideas? Could the logic board battery be dead, or maybe the power supply
> has an issue?
>
> Thanks!
>
> --
> -----
> You received this message because you are a member of the Vintage Macs
> group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our
> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
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> To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
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> http://groups.google.com/group/vintage-macs
>
> Support for older Macs: http://lowendmac.com/services/
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> Support for older Macs: http://lowendmac.com/services/
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You received this message because you are a member of the Vintage Macs group.
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| Re: LC 550 issue, two chimes then boot. [message #12965 is a reply to message #12852] |
Fri, 17 August 2012 14:53 |
Matthew Gill
Messages: 3
Registered: August 2012
Karma: 0
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Junior Member |
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Thanks for the help everyone. I'm sure the battery is probably just dead.
On Thursday, August 16, 2012 2:41:13 PM UTC-5, Matthew Gill wrote:
>
> I've got an LC 550. When I first tries using it, it booted up just fine. I
> don't recall how many times it chimed.
>
> Then, after plugging it again some time after it would NOT turn on. I'd
> hear the CRT make sound when you flipped the switch, but no power otherwise.
>
> After letting it sit while plugged in overnight, it fired right up! It
> chimed TWICE though, which is odd. I removed the logic board, checked the
> caps (they all look GOOD) and put it back... again, chimed twice and booted
> right up.
>
> Any ideas? Could the logic board battery be dead, or maybe the power
> supply has an issue?
>
> Thanks!
>
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
Support for older Macs: http://lowendmac.com/services/
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