Thanks dear, for asking again, I did check before with a flashlight tilted at an angle, the light was brighter than lcd backlight hence was seeing a black screen. In order to double sure I did test again today and also I tried to check the voltage at pin 40, when trying to do so I accidentally discovered some strange thing. When the connector is fixed tight getting black screen. When I pushed one side of the connector out at an angle i.e. pin 1 side it was displaying things. Here is the link showing the connector mode when i get the display.