Fixing a flickering HP LCD monitor

[mr34727]

So I grabbed cheap HP 2509m off craigslist that exhibits a flashing screen (much like if your refresh rate is set incorrectly).

Everything displays perfectly, however it....flashes....as though the backlight is pulsing between medium brightness and high brightness. Sometimes when I turn it on, it actually corrects itself after a few seconds and works perfectly.

Now, I bought this with the intent to open it up and attempt to repair it. It is a sunk cost, and if I break it further I am not concerned. I bought it to tinker with. My question to the master tinkerers is- where do I start? My initial idea was to open it up and check all the caps. However, I saw in the menu that the monitor only has 3800 hours on it. I am not positive, but that does not seem to be too many?

Any ideas you can throw into the pot would be greatly appreciated!

Thanks

I am uploading a video right now, should be live in a few minutes-
http://youtu.be/0o58ZdAr42k

Pics of the internal boards-
http://imgur.com/a/u03sv

PS- I can attach pictures to the thread instead if required, I just figured this would allow for higher resolution ones without clogging up the forum.

[lexwalker]

Re: Fixing a flickering HP LCD monitor

So I grabbed cheap HP 2509m off craigslist that exhibits a flashing screen (much like if your refresh rate is set incorrectly).

Everything displays perfectly, however it....flashes....as though the backlight is pulsing between medium brightness and high brightness. Sometimes when I turn it on, it actually corrects itself after a few seconds and works perfectly.

Now, I bought this with the intent to open it up and attempt to repair it. It is a sunk cost, and if I break it further I am not concerned. I bought it to tinker with. My question to the master tinkerers is- where do I start? My initial idea was to open it up and check all the caps. However, I saw in the menu that the monitor only has 3800 hours on it. I am not positive, but that does not seem to be too many?

Any ideas you can throw into the pot would be greatly appreciated!

Thanks

I am uploading a video right now, should be live in a few minutes-
http://youtu.be/0o58ZdAr42k

Pics of the internal boards-
http://imgur.com/a/u03sv

PS- I can attach pictures to the thread instead if required, I just figured this would allow for higher resolution ones without clogging up the forum.

Could be bad power supply, bad CCFL and/or bad transformer at the inverter section. From part of the description above, it does sound like badcaps. Sometimes badcaps may exhibit no signs of bulging or leaking. First, try replacing all the electrolytic capacitors on the secondary side as well as the big main filter/smoothing capacitor on the primary side. See if the problem goes away first...