G500s dislay goes black and flickerig

My G500s laptop screen goes black sometimes. It's not pure black screen, like the black is spreading from the edges to the centre of the display. Also there is colored lines flickering sometimes.
Link to image 1
Link to image 2
Note:-  I've a motherboard replacement recently, all these problems started after that.....
Moderator note: large image(s) converted to link(s):  About Posting Pictures In The Forums

hi Amaljith,
Welcome to Lenovo Community Forums!
You can try plugging in an external Display through the VGA port and make sure it is just a VGA to VGA connection.
See if the system will output properly through the External VGA Display.
If you're getting the same then I think it's the Mainboard Graphics.
If the External display shows fine. Have the LCD and LCD cable checked.
Regards
Solid Cruver
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