Dell E3330 Display coming on LCD Screen after Windows load

I Face a weird issue in dell E3330 Laptop that when its boot it don't show Dell Splash logo and BIOS windows display only show display after windows logging screen load.But all display showing in external display. I try following troubleshooting:-

1.I remove and refix LCD cable from both end  but problem not resolved.

2.update video driver,update latest BIOS,OS reinstall but same problem.

3.Then i remove CMOS battery and refix but problem not solved.

4.I replaced LCD Screen for this but problem remian same.

5.swap RAM,HDD but not solved.

6.Search on internet many time but not proper solution found

So can any body support me for this issue.