Lenovo G50-45 ACLU5 ACLU6 NM-A281 1.0

Every week I have 2-3 of these laptops with no screen problem. I had try the bios upadate and reflow gpu but never works. is that possible to be faulty something else? I make these steps in 10-15 laptops. Maybe must replace the big bios chip?
 
Every week I have 2-3 of these laptops with no screen problem. I had try the bios upadate and reflow gpu but never works. is that possible to be faulty something else? I make these steps in 10-15 laptops. Maybe must replace the big bios chip?
do reballing and try change cpu if not works
 

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