Back light keeps flickering and sometimes wont work

HI Ray....unhook the plug going from the power to main board and see if you get backlights when you plug the set in, if you do chances are you have a bad replacement main

There are long skinny light tubes behind the screen that use high voltage to operate. What you are seeing is what it looks like right before they fail. They can be replaced, but it is a big job.

If it's not under warranty, buy a new one from newegg dot com.

mine was doing that before the picture finally went all the way out
till then to get it to stop flickering open menu go to picture setting and cut on light sensor
its prolly the backlights going out as well has the capacitors going out

Flickering is a back light issue, jumping around would be caused by the screens reaction to a bad inverter and so would the backlight as well. So flickering backlight and jumping would be a inverter issue causing both problems so I would replace them both.

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The filter capacitors in the power supply are going bad. This leads to more ripple in the voltage which is why you see the screen flicker. Sometimes the transformers that drive the lights go bad themselves, but generally when that happens you won't have a backlight. Replace the capacitors with the exact same ratings, except you could go up a bit in voltage, and make sure the temperature rating is 105 C or higher. This will stop the flickering.

Hi

Do a BIOS update and Vedio card driver update for this issue

find the link below to download drivers

http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?lc=en&dlc=en&cc=us&product=3224052&lang=en&

Did you say the the video output flickers on and off when you connect an external monitor to the video output. If the inverter is faulty this would not affect the video output and the external monitor would not flicker but if the external monitor flickers it would point to a video card problem.

The Lights Flickering is most likely a defective Voltage regulator in the Alternator. Use a Volt meter to determine this.. I think its isolated from the door locks.. Im not good on door locks.. So not much help there.. But hope what lil bit I do know helped ya. thankx

I am sure that the issue is related to the cable that connects to the LCD Display or the LCD Backlight.
There should be some connection shortage because of which the LCD flickers few times as stated by dan231.
I Recommend you to get the Notebook examined as soon as possible before something really goes wrong...