Ask Dell Latitude 7470 ADM70 LA-C631 REV : 1

[khalid2019]

Am a technician and I faced the following problems : The above dell model laptop has a bios issue and i got a working bios , but after i used the new bios file it works only one time but after i turned off the pc the display will not come again i have to flash the bios again so anyone can give final solution please ????
and a working clean bios file

 

[ThienBui]

Am a technician and I faced the following problems : The above dell model laptop has a bios issue and i got a working bios , but after i used the new bios file it works only one time but after i turned off the pc the display will not come again i have to flash the bios again so anyone can give final solution please ????
and a working clean bios file

need to try another bios if same problem then it's not due to bios

 

[khalid2019]

I tried more than 5 file but nothing , some don't have display and others same issue ,
is there anything i have to check on the motherboard ??
cause there are 7 laptops with the same problem and same model.
am attaching the original two files