[help]dv9740el no backlight after hp logo!!!

[phantomEVO]

hi, please help me

when i power on, i can see clearly the hp logo then all it's dark.

if i enter into the bios i see it, but very very very dark

if i put an external monitor i can't see the bios, but when windows boot, i can see clearly the operating system on the external screen and use the pc without problem!

another strange thing, soon before windows boot, the arrow point appears for some seconds than disappear

another strange thing: when i disconnect the external monitor, some times the internal monitor power on and i can see clearly!

if i disconnect the battery and the power chord, holding power button and the i reinsert the power chord, i can boot into the bios and see the bios for 2/3 second

i've try another screen and another inverter: still the same

here's the problem

https://www.youtube.com/watch?v=o6BGUJU8U_s

[phantomEVO]

Re: [help]dv9740el no backlight after hp logo!!!

found the problem! i has bought this "dead" notebook for 10 euros. it was with black screen so i've bought another notebook with perfect screen but dead motherboard. i've changed the screen and got the problem. now i've done some experiment and found that

the old screen with the cable from the "newer" screen, boot up and works flawlessly.the newer screen with the cable of the "old" doesn't boot. so

the old screen with the new cable boot perfect

the new screen with the new cable boot perfect but then i not have backlight

i wondering why the new screen work correctly and if i can be able to fix it

the old screen is b170pw06 v2

the new is ltn170x2-l02

[LP_tekh]

Re: [help]dv9740el no backlight after hp logo!!!

First, try to disconnect and reconnect the screen cable on both side.
Check the ccfl bulb or inverter.