It could also be the inverter board or graphics card. I've had a few that started like that. First an intermittent problem, often 'fixed' for a little while with a reboot or gentle flexing of the screen. Eventually the problem in the various laptops became permanent.
In a couple it was the inverter board. If you shine a bright light onto the screen with the laptop running can you see a faint image? If so then the inverter has died. Usually a cheap & easy fix.
Another couple had issues with bad soldering on the graphics card or the graphic's connectors into the motherboard. It was a common issue for the model series. Fixing it required resoldering the affected joints or replacing the parts. Not so cheap or easy.
My current laptop was one of these, as was my wife's (we had matching laptops). Both were around 5 years old. I'd previously bought a similar model for parts to replace a keyboard on my wife's one, and the screen on mine after I stepped on the laptop one dark morning while pre-flighting. Eventually the graphics problem hit both of ours + some other bits failing between them. I mixed & matched parts from all three machines to make one working laptop. Still going and Frankenputer is 9 years old now. Or would be if we counted from the purchase of the two matched originals.