T400 LCD Screen flickers or blinks every 5 seconds

T400 with Win XP Pro and Integrated Graphics, all the latest updates. Even did a Rescue to original factory.
I have read numerous issues with Thinkpad screen flickering, but have not found a solution for my laptop.
My T400 just started doing the following: Every 5 seconds, the screen will flicker one time looking like an old CRT screen rolling over once. Every 5 seconds. Oddly, this occurs only at the 60Hz rate. When I set the rate at 50Hz, the problem appears to get fixed. I have disable the Graphics Battery power option.
The flicker occurs during boot up even on the initial black / white screen, narrowing it down to hardware or bios.
Given the number of LCD issues I've read about on this era of machine (2009), I called Lenovo to see if there was a recall - they said no. I'm a Thinkpad fan, but I am beginning to wonder if Lenovo is not acknowledging a known defect.
I just want to know what to fix. Is this a defective LCD screen, or a motherboard chip issue?
Any thoughts out there??

This isn't a widespread defect AFAIK.
Do you have switchable graphics?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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> {quote:title=FrankieCz wrote:}{quote}
> Hi,
> I need help my X500 won't start now. I tried to start the NB as usual and suddenly the X500 wont boot or even power up.
>
> If I press power button it doesnt make any sound, the power LED on button and the second power LED just bliks once and turns of, and keep blinking every 5 seconds.
>
> I tried to:
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> * power with battery only
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>
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>
> I checked the AC & Battery LEDs, but they are not flashing, they are just RED, so there is not proble in battery or AC.
>
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>
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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.
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3. The laptop recognizes when I open and close the lid and switches on the ext monitor accordingly.
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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?
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Edit: Richk was faster!
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T400 LCD Screen flickers or blinks every 5 seconds

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