| emac in coma [message #247475] |
Wed, 19 March 2014 09:06  |
Don Wakefield
Messages: 7
Registered: June 2013
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My trusty eMac suddenly will not come to life. It was working fine when I powered it down to move it to another desk. It sat disconnect for almost 3 days and when it came time to power it up in the new location - nothing! No "bong," no fan noise, no drive spin noise. I have tested the end of the plug which goes into the body with a VOM and it does indeed have 117v. I have taken the bottom off, checked that the ram is seated, and pushed the PMU button to no avail. Any other ideas as to how to wake this guy up before I invest $$ at my friendly repair shop?
Don Wakefield
DTPetc! (DeskTop Productions et cetera!)
Ballwin, Missouri, USA
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| Re: emac in coma [message #247476 is a reply to message #247475] |
Wed, 19 March 2014 09:26  |
Cameron Kaiser
Messages: 1622
Registered: December 2011
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> My trusty eMac suddenly will not come to life. It was working fine when I
> powered it down to move it to another desk. It sat disconnect for almost 3
> days and when it came time to power it up in the new location - nothing! No
> "bong," no fan noise, no drive spin noise. _I have tested the end of the
> plug which goes into the body with a VOM and it does indeed have 117v. I
> have taken the bottom off, checked that the ram is seated, and pushed the
> PMU button to no avail. Any other ideas as to how to wake this guy up
> before I invest $$ at my friendly repair shop?
I hate to say it, but this sounds suspiciously like the power supply. Some
marginal caps may wake up if you leave them plugged in for a couple days.
Unfortunately, the eMac power supply is (IIRC) integrated with the display
and analogue assembly, so unless you are able to do a component level
repair, you may be looking at finding a new machine.
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Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser@floodgap.com
-- armadillo, n. the act of providing weapons to a Spanish pickle. ------------
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| Re: emac in coma [message #247477 is a reply to message #247475] |
Wed, 19 March 2014 09:31 |
Cameron Kaiser
Messages: 1622
Registered: December 2011
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One other suggestion: I dug out my service manual stack and the eMac
manual suggests verifying the PMU battery and resetting it. You stated
you reset it, but didn't mention the battery.
None of their other suggestions recommend anything other than replacement,
unfortunately.
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Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser@floodgap.com
-- Immortality can always be assured by spectacular error. -- J. K. Galbraith -
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| Re: emac in coma [message #247478 is a reply to message #247477] |
Wed, 19 March 2014 10:04 |
Jim Scott
Messages: 16
Registered: December 2012
Karma: 0
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Junior Member |
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Sent from my iPad
> On Mar 19, 2014, at 6:31 AM, Cameron Kaiser <spectre@floodgap.com> wrote:
>
> One other suggestion: I dug out my service manual stack and the eMac
> manual suggests verifying the PMU battery and resetting it. You stated
> you reset it, but didn't mention the battery.
>
> None of their other suggestions recommend anything
My experience with eMacs that suddenly stop working after being unplugged for a while is to check the logic board and the down converter plugged into it for bad capacitors. Up to 7 of the 11-12 caps on the down converter daughter board can show bulging and/or leaking. Since the down converter powers everything connected to the logic board, a bad one can have the same effect on startup as a bad power supply in the analog/video assembly.
The fix is to replace the down converter with a known-good used or new one -- if one can be found, or replace the bad caps, which will entail more than a little effort to identify and then procure the replacements.
Been there, fixed 'em.
Jim Scott
Eureka, CA
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| Re: emac in coma [message #247491 is a reply to message #247475] |
Wed, 19 March 2014 15:22 |
Kris Tilford
Messages: 133
Registered: August 2012
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Senior Member |
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On Mar 19, 2014, at 8:06 AM, Don Wakefield <dtpetc@yahoo.com> wrote:
> Any other ideas as to how to wake this guy up before I invest $$ at my friendly repair shop?
A dead PRAM battery could be your issue. If the PRAM battery hasn't been replaced ever, it's almost certainly dead, and needs replacement.
If the PRAM battery is good, the power button is the next thing, these do break often, and a Google search for "eMac power button" will get you some replacement ideas if yours is broken. Here's a good link to power button replacement, and there's a link to a full eMac service manual on this page:
<http://forums.macrumors.com/showthread.php?t=1307033>
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