T400 LED screen flickering​ly

i bought T400 2764 CTO one year ago just because "thinkpad" name and it strong body and reliable quality;
in the june, just pass one year warrantee period, it screen start flickeringly--i did change adapter, switch the graphical card to internal or ATI again and again, never change the situation, really driving me go crazy, i also connected with desk TFT monitor, it screen showed normal
any one has the same experience on it please?
** bois and s/w to be update **
RGDS
Richard

this is a routine check, i just want to make sure it is your hardware that is having the problem and not some peripheral parts that is giving the problem.
In any case, i think it is a LCD related issue. Do you have warranty still? Flickering issue is related to the LED backlight that is used in your LCD. 
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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