Laptop screen split into three

Even my laptop screen is split. Occasionally, the display becomes normal. Therefore, it's not a hardware problem 

my thoshiba laptop C640 has same problem.its work fine sometime.most of the time it is split into three section. 
i replaced thoshiba laptop C640  lcd without changing lvds cable with  another laptop same screen (hasee hec41) 
 thoshiba laptop shows normal display with hasee laptop screen 
 i also tested my thoshiba lcd with hasee laptop .same problem exist (display split into 3) with hasee laptop when connecting thoshiba lcd

here i am not changed the lvds cable of both lap ..i only chnaged lcd part


so it is confirmed  that problem with lcd screen not motherboard.,lvds cable,or even software.