how about checking the monitor power down settings in the computer......

When the main screen comes on it last maybe a second.

but did you actually check the powerdown settings? Not the screen saver, but on control panel|power

And have you tried another video card before you start tearing down a costly LCD panel with no real knowledge of what you are doing.

my best bet is there is something wrong with the caps on the monitor board... that seems to be about the only thing i came up with on google.... there isn't much but what there is isn't in english

Cool that we bring up this topic again.

As I’m fixing more and more screens these days I found out that it’s a general backlight problem with many models/brands.

Most of the time it’s a problem with bad transistors that drive the backlight coils, bad soldering points and the coils them selves.

To replace coils will be hard as they are not sold at your local electronics-store, however, the transistors are basic pull-transistors that can be found in almost every electronics-store and re-soldering the bad/cold points is a peace of cake.

so how do we go about figuring out which are bad points and all that jazz? is there a decently easy way to do this?

also, i got mine for free from an aunt and uncle, they said it didn't work, i had it running for about two days and then i turned it off, when i went to turn it back on is when it didn't work... i'm letting it sit for a while, but i'd like to fix it 100%

This post has been edited by aszwet1: Mar 10 2008, 07:06 PM

There are no capacitors that drive the backlight, however, the power to the backlight module has capacitors but if those were damaged then most likely the screen would not even light up.

Exactly, you have bad transistors; they overhead fast and thus aging goes faster too. Replacing them isn’t hard if you know soldering a bit, but before you remove them I would check your local electronics-store if they have them, or at least can order them. They should be cheap and you don’t need more then 6 of them (never saw a screen that used more then 6 and 2 coils). What brand/model do you have? HP?...

kds k917s, 900d.

how do i know which are the good and which are the bad ones... i'm a n00b when it comes tho this kinda stuff.

Replace them all, they are cheap; let me see if I can find the module lay-out.

like those are what i'm replacing right? and i can't find any blueprints or whatever for the boards... also i'm just replacing the powersupply board right? not the one with the chip in it or whatever? would pics help?

This post has been edited by aszwet1: Mar 10 2008, 10:24 PM

Those are not transistors, those are capacitors and those aren’t your problem.

Take the board out and make 2 pictures; one from the back and one from the top, if possible on high resolution and using www.kwikpiks.com to upload them. Remember to use the thumbnails to post here and the link to the bigger version .

I have a similar problem and can send a few pics of the boards in the monitor if it would help.

Please do. Just follow PuntoMX's directions.

Mark

if the monitor just stays on for a few seconds and turns off, i suggest double checking the power adapter for it. I have two HP f1703 monitors, and if the amperage is not high enough (3.5a minumum) the screen will turn on for a few seconds and then shut off. you may be interested in checking that for a much simpler fix.

I'm facing the same issue here, it seems to be a common problem. I'll crack this bad boy open soon and post some hi-res pics.

Edit: For about a month before the monitor s*** the bed, it was making a high pitched squeal. I have no idea if that helps diagnose the problem at all.

This post has been edited by StankCheeze: Aug 7 2008, 10:05 AM

That sounds like the coils (resonance), those are not hard to replace but hard to get, also it’s most likely that you need to change the transistors connected to them too.

Digi-Key wouldn't have them?

I can´t tell, but you could give it a try...

You have to take the module to the shop to show them what you want, the coil looks like this more or less:

It looks like the problem is a group of 6 capacitors on the power supply. 5 of the 6 are bulging. They're all the same, 470µF, 25V. Radio Shack carries 470