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Yes, with the main board disconnected it will power up as soon as it is plugged in. If you don't have the ext-autogen pins connected there will be no picture. You may see a grey screen depending on how bright the lighting in the room is.
I strongly recommend using the ext-autogen to confirm that your panel is good - Nothing is worse than than fixing one fault only to find your panel has dead lines/pixels or a bad buffer - though if it was your personal set and you know the picture was fine before the main board failed you can rule this out.
I have used a hot air station set at 350 degrees celcius and a generic hardware store heat gun that isn't calibrated set to max.
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