Backlit keyboard repeated trouble

Hi everybody;
I have a MBPR that I use to work, about a pair of months ago it had several issues. First the camera stop working, then the backlit began to flashing. I had to take it to the technical service. To repair the first trouble (the camera) they had to replace the logic board and a week after for the flashing backlit problem they had to replaced the logic board again, the display and the top case. This repairs delayed more than a month and the device was returned to me a few days ago.
All looks good, but today I noted that after several hours of working (about 3 hours), the backlit stop of run and dont work in any way, if I turn off the computer and turn on after an hours the backlit works normal again.
I really dont know what to do about it, I would like that my device works perfect because is almost a new device, and with these issues and all the pieces that have been replaced I'm afrait that in the future could be a bigger problem. By other hand I dont wanna go to the technical service again because I use my computer to work and because the all the bad working device I'm delayed in more than a month. So I would like your opinion about this issue. Do you think that the backlit issue could be something more serius in the future? Maybe there is easier solution and I dont have to go to the technical service again.
Thank you.

You probably have the backlit feature turned off in the Keyboard and Mouse system preference. Turn it back on. The other possibility is your room is too light for the keyboard to activate. You can cover up the left and right speaker grills to simulate darkness and try the keyboard short cuts.
Glor

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