Worst backlight issue ever.

I recently purchased a powerbook DVI 667 on ebay, knowing that the backlight didn't work. It was my thought that a simple inverterboard replacement would fix the problem, so I ordered a new inverterboard at the same time.
They both came, and to my surprise the new inverterboard also had a new cable. Unfortunately nothing I did could fix the problem. Replacing the inverterboard didn't help.
With a voltmeter I measured that the inverter produced well over a thousand volts for a brief second, and then stopped. Then from the old inverter I measured the same thing. I do not think it is the backlight CCFL tubes simply because the voltage coming out of the inverter fluctuates without the backlight connected. So I believed the only other problem could be the logic board. I was able to measure voltages from the logic board fluctuating whenever the screen should have turned on its backlight, but they did not sustain themselves, so it looked like a bad logic board. Not an item I wanted to replace, but I bought one anyway.
Having installed it today, the problem persists. I am fairly sure this logic board is of high quality. Could both inverters have been bad? If you were me, would you spend 55 more dollars on another inverter to see if it would work?
I have tested removing selected components and then booting the machine to see if there is any interference, but removing things does not help anything.
Could this have anything to do with the power supply? It does not run properly regardless of the batter or power being used. I have the same voltage, and amperage that the machine requires, but it is an older yo-yo style power cord.
I've triple checked to make sure nothing was shorting the logic board.
Powerbook Titanium DVI 667   Mac OS X (10.4.5)   30GB HD, 768MB RAM

Well i just had this same issue last week; so i order my part from http://www.pbparts.com/shop/di.html
Works one thousand percent better. This was the best place to order my part and it was a perfect transaction. I just installed the part about two hours ago (to be honest w/you) and i'm back up and running.
Sorry this post sounds like a sales pitch :O
--Paul

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