First i want to say im not a pro electronics tech but i know how to solder and im decent at repair. Im not a rookie though and im not real fermiliar with monitor repair special these new LCDs.

For about 6 months ive smelt this plastic burning smell. Threw my years of playign with electronics stuff you get a sence of what wire and electronics smell like when they are burning. Ive smelt this for about 6 months but i just couldnt find where it was comming from. Today i finaly seen some smoke and found it was comming from my LCD monitor. Ive suspected it for a while but it never gave any symptoms of failing.

I turned it off when i seen the smoke so i know its still working but i have a good feeling its about to fail. After i removed all the screws and dug into the electronics the first thing i seen was the burnt plastic safty shield over what i think is the hig voltage regulator. I see some little warning logos and high voltage tags in place on this board so i think its what it is.

When i see this burnt plastic i can see somthing is about to go.



[IMG][/IMG]

After i remove the scres for this board i see what looks like a voltage filter? i see other what looks like caps in the other 4 corners that seem to be inline with the coils like the one that looks cooked. I hope i can replace the caps and it will continue to work. I know caps are a big problem with electronics and special in the last 5 years they seem to be getting worse.

My question is what value the caps are? I see what looks like 22J then 3KV, searching google gives me a result of 22picofarad 3000 volts. Is this what i need? are these things using 3000 volts? is this wy there is silcon surounding the leads and stuff? I thought ide ask around before i order a part that may not be the correct part.



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Thanks for any help, maybe my findings can help some one else with their problems.

Sorry for the multiple images, i figured i could edit out wich links didnt work but i guess they all do and no editing.

You are correct with the value, these things will be across the mains and as the unit is designed to work on 110 to 240V the voltage span can be about 800V these take spikes out so you can double that to be safe. If I were doing this I would use 6KV capacitors and scrape the board to get rid of all carbon regardless if you have to dig holes, and the burnt silistic, do not use any silastic at all.

Sorry to correct you Rob but these are on the output of the backlight inverter and are in series with the lamp.

You are correct in the value and voltage.

Make sure the PCB has not carbonised and shorting to a gnd track or mounting nearby, remove all the carbon with a stiff brush like a brass bristled brush.

Rich

No probs, actually only assumed it was in the supply but still holds true I think increase the voltage of these if they fail unlike electrolytics where you need to stick close to the design value.

so i need to up the voltage on the cap? also where can i get that white glue stuff? ill need to replace that also?

Should i replace em all? if its a common part that leaks maybe the others will be next?

Trying to find a cap higher than 3kV is not worth it and no I would not replace the others, this part in this position is not that a common failure point.

Rich