Bypass failed PAV (power analog video) to use external monitor?

"Patient" is a 7+ year old iMac DV 400 (CRT; slot-loading). It fails to start up. The LED in the power button lights briefly, it sounds as if the hard drive starts to spin up, and small patches of light appear in the upper and lower corners of the right side of the screen. Prior to this status, the display had been reduced in brightness for a couple of months. The day before it died, the image on the screen started pulsing at the sides and horizontal streaks flashed across the upper third of the image. I shut the machine down for half an hour then restarted and it was back to normal. The next day, the pulsing and lines returned; shut down and tried to restart in 1.5 hours, but no go (symptoms above).
I replaced the 3.6V lithium battery and reset the PMU/CUDA. No change. I am told that the symptoms are characteristic of a failed PAV board. I read in another thread here ( http://discussions.apple.com/thread.jspa?messageID=3110595&#3110595 ) that it may be possible to bypass the failed PAV and connect an internal cable (via an adapter) display (i.e., not using the existing extrnal VGA port). Here is a quote from the above thread (12th reply; "However, for those of us with tray-loaders iMacs that have failed video boards, you can simply disconnect the internal video connector. This connector is essentially a "VGA" cable inside the iMac case, but it uses the old-style Apple video connector. It is a simple matter to buy an Apple-to-VGA adapter and connect it to the internal video output and connect that to a VGA cable leading to an external monitor".
Is this possible with a slot-loading iMac? If so can someone please point me to instructions for doing so (ideally with photos/illustrations), or explain how to do it.
I will be very greatful for any help getting this iMac running again.

thanks for responses
@BurntSushi
here is what scrot gave me: http://dl.dropbox.com/u/292474/arch/output.jpg
but what i see is more like: http://dl.dropbox.com/u/292474/arch/output_view.jpg
@ewaller
interface is VGA. i have tried changing the H. Position on the monitor to "slide it back" but even when it's completely at 100% on one side i gain back half of the black area. i don't know what else i can change on the monitor that would help me out.

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