Laptop LCD display brightness issue

[ktmmotocross]

Re: Laptop LCD display brightness issue

Backlight is controlled from SIO by BL PWM signal that drive mosfet. u can check PWM signal and remove mosfet to drive BL with PSU. mosfet can be shorted so BL goes on full brightness no matter what signal is getting

[raajkumar]

Re: Laptop LCD display brightness issue

INV_DA: KBCoutput D/A signal(adjust voltage level)to adjust Back light

[andyred]

Re: Laptop LCD display brightness issue

@ktmmotocross, only if I can find that mosfet. Any idea where could it be located?

@raakjumar don't understand what you're trying to say there

[SMDFlea]

Re: Laptop LCD display brightness issue

Backlight is controlled from SIO by BL PWM signal that drive mosfet. u can check PWM signal and remove mosfet to drive BL with PSU. mosfet can be shorted so BL goes on full brightness no matter what signal is getting

The screen is eDP,can the mosfet be built into it or the motherboard ? ,i`m not sure reading the eDP spec .

[SMDFlea]

Re: Laptop LCD display brightness issue

[QUOTE=andyred;890072]@ktmmotocross, only if I can find that mosfet. Any idea where could it be located?

You need the boardview, i`ve already posted that if you make a request, someone may be kind enough to post it,if they have it.

http://sualaptop365.edu.vn/threads/a...rdviewer.1110/

[andyred]

Re: Laptop LCD display brightness issue

A strange thing that I've noticed just now. I can modify from the Intel HD graphics control panel the color brightness to a minimum value of -60 (color brightness, I have no screen brightness option available) Once I remove the AC cord and it remains only on battery the brightness goes up to maximum again but the -60 value remains unchanged.
I really don't understand what is going on here

[andyred]

Re: Laptop LCD display brightness issue

I've checked today the mosfets, none are shorted.