T500 display very dim , possible mechanical failure?

Hello,
It seems that my T500 LCD display has become very very dim, the display is barely visible.
After repeatedly turning it on/off it suddenly was able to display full brightness during one debug session... I even restarted it / shut it down multiple times, and it worked. HOWEVER, it seemed that the brightness was dependent on the angle at which the LCD was hinged, if I opened it all the way the screen became bright again (something over 90 degrees), if i started to close it (roughtly 30 degrees?), it became very dim. To me this sounds like a mechanical issue, possible a loose cable. Unfortuantely, I was not able to reproduce this again after this debug session, I suspected that as i was transporting it to/from work i may have changed some internal mechanical configuration.
Is there an actual 'mechanical' switch which drives the LCD brightness depending on the angular position of the LCD? I tried reading through the service manual here:
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/43y6630_04.pdf
I couldnt find any mention of any sort of LCD brightness mechanical hinge switch
=== other info===
From googling, the issue could also be :
a) inverter issues
b) backlight issues
c) fuse on mother board?
As a quick test, i hooked up the VGA output to a secondary monitor and that works fine, so long as I go to the BIOS and set it to boot to the VGA first as the primary display.
Any suggestions would be great!

Try going into the BIOS and switching to Integrated Graphics only. Does the screen still remains dark/dim?
/L40SX/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E/A20p/A22p
A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T4x0x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/10*X2xx/2*X200T/4*X30x/Z60m/3*Z61x
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Link to image
Moderator note: images totalling more than 50k converted to links per forum rules: Lenovo Community Participation Rules

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Message was edited by: Nathan Alden

T500 display very dim , possible mechanical failure?

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