[CUBE] no power to cube -- logic board?

[Rick Rodman]

You won't get any advice like that on this list.  The best would be if 
you could swap components from a working cube.  My guess would be the 
DC-DC converter board is fried, despite its green light.

However!! I would check all the connections very carefully.  Run the 
cube outside the clear case.  I don't know an easy way to bypass the 
fancy shmancy, but there must be some points you could jumper to power 
up the machine (folks?).  Make sure the cpu board is seated properly, 
and the video card, and all the cable connectors.  Check the voltages 
on the drive and muffler connectors with a voltmeter.  Examine the 
DC/DC board for charred or blistered components.

Logic board = motherboard, but the cpu is on a daughtercard, and the 
cpu upgrade only replaces the daughtercard.

Powerlogix is reportedly working on a replacement DC/DC board with more 
power capability.

Congratulations on a very fortunate acquisition.  May you and your Cube 
have a long, productive and enjoyable relationship!
Rick

On Thursday, December 12, 2002, at 09:36 PM, mike wrote:

> Howdy.
>
> I'm in a little bit of a fix, and I was wondering if I could get some 
> advice from any of you.  I got a broken cube 500?mhz w/dvd for the low 
> price of nothing, which didn't include applecare.  I'm a recent osx 
> desktop convert from freebsd on x86, so I'm not yet comfortable with 
> mac hardware, much less cube hardware.  an apple-certified tech told 
> me I needed a new $900 logic board, so I might as well get a new iMac. 
>  Well, if I didn't want a cube, I suppose I'd go and do that.  Here's 
> to hoping I don't get any advice like that on a cube-centric list. :-)
>
> The cube gets power to the motherboard (green light goes on).  Fancy 
> Dancy Electrostatic power button does nothing.  apple tech documents 
> 58780 and 88037 have been tried and failed.  Top assembly has been 
> replaced but to no avail.  My thoughts are that I can replace it for 
> $650, and get 800mhz speed at that ($300-ish logic board on the net + 
> $400 800mhz powerlogix cpu upgrade/motherboard, unless I'm confused 
> and the powerlogix upgrade includes the logic board -- I'm not sure if 
> logic board and motherboard are different or synonymous), but a second 
> opinion is much needed before I burn that kind of moolah.
>
> Also, does anyone disagree with the apple tech regarding the logic 
> board replacement?  Might my problem be the dc/dc converter, even 
> though it provides the green light?  If so, does anyone know where I 
> can get a replacement internal dc/dc converter, or about how much they 
> cost?
>
> Any help is much appreciated.
>
> Mike
>
>
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