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Screen flicker.

post #1 of 4
Thread Starter 
I didn't come here for some harebrained answer that i get from yahoo answers.
I came here because of the intelligent people associated with this website. Okay now my problem...

I have an LCD Monitor that my friend gave me that he said broke. When i first got a hold of it, it looked as if it had a Power supply issue, a blown cap etc. Well I replaced every capacitor on it, and its still Flickers one time, when i plug it in. and then after that, unusable. So im resorting to you guys to maybe find out whats wrong, oh and i even increased the amount of voltage on the capacitors to make sure they wont blow out. If you guys need extra info like pics or video, i can try to do so.
bob
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bob
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post #2 of 4
Did the friend mentioned, if the panel had been damaged in any way? Chances are the actual LCD panel (that connects to a PCB) might be damaged and you would have to replace that.

Since you've already replaced the Power Supply and a capacitor or two, this would be the most likely issue.
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post #3 of 4
There is a part that is ussually referred to as the "inverter" that in my experience will go bad if the screen stops working right. I've changed a lot of them on laptops.

Though if you increased the size of the caps you might be feeding it too much power now.

Though, if a cap is blown I ussually toss what ever it is, because if it blew it probably sent a burst of power killing everything on its circut. It isn't worth the trouble to fix. I've done it a couple time for fun...but I've never gotten the device to work.
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My System
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post #4 of 4
From my understanding, replacing the caps with ones that are rated higher in voltage may not have been the best choice. Do you still have the old ones?

I am going to agree with Vagrant Storm and say that you may want to look into replacing the transformer (which is what I assume he meant by inverter, as the whole power board makes up an inverter). It is the large, usually square, thing with wire wrapped around it. There is a decent picture of one in my tutorial, it is a big yellow square in the overview shot of the board. I would also suggest removing the caps you replaced and putting in ones that are closer in spec to the originals - not just in farad and voltage value, but ESR and ripple value as well.

It may also be helpful for you to post a picture of the board. Do you know the brand of the old caps? and what is the brand of the new ones?

edit: what is the brand and model of the monitor? I might already know what caps were inside it.

Here is a link to where these things were explained to me. http://www.badcaps.net/forum/showthread.php?t=14662
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Neckpain
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