Re: Laptop screen flickers,then goes black
Sounds like a malfunctioning backlight. It could be that after 5 years the connection has gotten loose, or something on the backlight has corroded enough that it's breaking and so it's only coming on every once and a while. The burning smell could be unrelated, and be caused by dust build up in your fans and heatsink and the high temperatures from the CPU and GPU are singeing dust. Alternatively it could be corrosion on the backlight in which case it's toast.
You'll probably have to replace the backlight, which if you're not tech savvy / handy with taking things apart, could be a costly repair. Anything related to laptop screens takes about 2-3 hours which at most repair shops is a couple hundred bucks, plus the cost of the part itself.
If you aren't planning on doing it yourself I'd go take it to a repair shop and tell them that you think it's the backlight (or ask if they'll give a free diagnosis) and ask how much a repair would be, and then decide if it's worth it to even keep the laptop.
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