Monitor repair, power inverter for screen

[eyemaster]

At home, I have a Compaq / HP Pressario V3000. The monitor works for a few minutes at times when on battery power (brightness at about 50%), sometimes less than a minute. When on wall power, the monitor works for 4 seconds (100% brightness). The LCD still has a working image, but the backlight is not staying on.

According to the internet (so you know it's true... )I tried changing the power inverter (located inside the monitor frame) but I'm getting the same results, so it did not fix the problem.

Did I do the wrong fix?

Is the power inverter DOA?

Is it the bulb? I have no way of testing the bulb...

Would there be a way to just force the power to go to the screen? How do I determine exactly what is not working properly? The symptoms match everything I find online, why is the supposed fix not working?

Thanks.

 

[WR2]

Hello EyeMaster;

Since you're changed out the inverter the next suspect is the bulb itself.
Seems to be failing sooner under higher power load. If you set brightness @ 30% how long will it stay running? At 20%?
You might find a low power option that won't send the bulb to bed.

 

[WR2]

Backlight bulb attached to the inverter board.

 

[eyemaster]

Backlight bulb attached to the inverter board.
http://static.howstuffworks.com/gif/lcd-backlight.jpg

When I set it to 30% or the lowest brightness setting, it stays on quite a bit, for at least 10 minutes.

Does this point to the inverter or bulb?

 

[WR2]

Points to the backlight tube/bulb getting ready to fail, I think. Higher power draw = sooner shut down.

 

[eyemaster]

Best answer selected by eyemaster.