I have had the mx6920 laptop for 3 years and just recently the monitor has been going black screen, periodically and with no descernible pattern. The CPU is still running, but I have to do a hard reboot to get laptop running again.
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Yes, The pink tint is an indication that the backlight is failing. Now the backlight is basically dead, the best way to get back going is to do an Ebay search for your model laptop and get a new screen. Most screens can be purchased for around $50.00 - $70.00 and they are very easy to swap. Email me if you need more info.
If you're working on the computer when that happens, it's not probably a power setting. Try to update your BIOS to the most current version at the toshiba support website (support.toshiba.com) & see what happens. Fixes the issue most of the time
I have a similar problem with my screen, same one, 15". For a period of two years it would turn black for an instant and resume functioning. Since two weeks it only flashes the picture for an instant and then turns black again. We opened it up to check the wiring but nothing wrong there. We are 99.99% sure that the problem is in the screen itself and has nothing to do with drivers or anything else in the computer. If you bought it less than 3 years ago and since it is probably a result of faulty construction, it should fall under warranty (by european law). I am going to take mine to a repairman tomorrow, i will inform you wether the screen can be repaired or not.