T400 LCD screen black after replecement

History - T400 (2767-31U), Win 7.
LCD screen broken due to a drop. Laptop still worked with an external monitor via VGA slot and I ordered a replacement LCD.
The replacement finally (used-off ebay) arrived and I followed the HMM manual and replaced the LCD. But it still does not work. I can continue to use the ext monitor without any issues. The replacement LCD was the full assembly not just the LCD screen.
Here is what I noticed:
1. When booting up, I see the Thinkpad logo very very faintly before it goes fully black again.
2. All the LCD panel lights work fine - Wireless, BT, HDD, Battery, Power etc etc including the reading light.
3. The laptop recognizes when I open and close the lid and switches on the ext monitor accordingly.
Here is what I did (I followed the HMM to the detail):
4. When I replaced the LCD, I noticed that the original LCD had 2 black wires insulated at the ends originating from the bottom left area of the LCD that were not actually plugged into any area of the MB. I did the same on the replacement LCD and left them as it is. I don't even know what these are.
5. I connected the other 3 wires(white, grey and black) and the main connector as the original LCD/HMM.
6. I uninstalled the display drivers and restarted and Win 7 automatically installed the drivers again.
7. The Most important part - The original LCD when powered on, DID have backlight showing me the mangled area of the screen so I know it worked before replacement.
I have read quite a bit of posts regarding T400 black screen issues, pointing me towards a faulty MB, blown fuse or faulty inverter. I know the replacement is an exact replica of the original LCD.
Could it be that I didn't connect the wires correctly to their respective slots on the MB?
Any inputs would be highly appreciated.
Edit:
Solved!
Go to Solution.

Welcome to the forum!
Do I understand correctly that you bought a complete new LCD Assembly? Do you have proof from the seller that it was working properly before you bought it?
Can you see a picture if you use a torchlight over the panel?
A faint dark picture could be a defective LCD cable, inverter/LED card or a defective LCD backlight. Since you see a picture I would rule out a motherboard fuse problem.
Edit: Richk was faster!
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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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