Display Problem (white brighteness)

M2013

Honorable
Oct 18, 2013
1
0
10,510
Hello ! I have a TOSHIBA PORTEGE LAPTOP R930 series. After 4-5 minutes when I press play to see a movie (or documentary etc) on any Video Player the display starts turning bright white for 1 minute. Then it returns to normal for 1 minute and then again bright white and so on . What is the cause of the problem ? Thank you in advance.