T61 Nvidia internal display vs. dock question

I've read the threads on the Nvidia issue and I'm grasping at straws that my problem may relate to a different component. The internal screen on my T61 blanked out a few weeks ago but both analog and digital outputs are fine on the dock. The backlight is on and on startup the internal screen sometimes works for a few minutes. I've tried substituting a different screen with the same results. Is the Nvidia chip the only likely culprit or does a different chip do the internal/dock display switching?
T61 6459CTO Serial L3-xxxxx Date 08/04
Board 42W7876 P42X5035
Thank you
Moderator Note; s/n edited for member's own protection

Welcome to the forum!
Has the LCD been reddish/pinkish on intial startup recently prior to the issue that you're describing?
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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Check this document
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Feedback can be submitted here:
http://www.apple.com/feedback/macosx.html

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T61 Nvidia internal display vs. dock question

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