Laptop periodic dimming

[synergy]

Hi there,

I have a laptop to fix and there's an issue with the display. It's a HP Pavilion G6 2300 series and running Windows 8. Basically it was dropped a while ago and since then there's a been a line across near the top of the screen which of course suggests a damaged screen. However the screen also dims slightly and then brightens every second or so, like it's on a timer. This is constant and begins as soon as the laptop is turned on.

I have plugged the screen into an external monitor and everything is fine so it's not a GPU issue. I took the screen apart and I can't see an inverter so I presume it's an LED display.

I was wondering if it might be some sort of power issue within the laptop or would replacing the screen do the trick? I don't want to replace the screen if it doesn't solve the periodic dimming issue. Any help or info would be greatly appreciated.

Thanks

[MrNinja]

Out of curiosity can you change your power settings to high performance and see if that corrects the issue?
I assume when you took it apart it looked as though the ribbon was ok?

Had a similar issue with a dell not long back, actually turned out to be the AC jack had been damaged and was connecting and losing the AC intermittently.

[dannyboy75]

If it has an ambient light sensor you can also try disabling that via its windows settings or BIOS.

[PlayerAsleep]

If nothing works you could try replacing the screen with a second hand unit. They are not that hard to replace.

[woodi]

It could be the ambient light sensor also try adjusting the screen brightness and messing with the power settings in windows. If not i second what playerasleep said and just replace the screen.