Dell 2208wfp hissing

[reabbott]

I have 3 of these, all with the same issue, 3 seconds to blank. I replaced the burnt out caps on all 3 screens, two of them came back alive. This is an image of the 3rd one.

In the image, the red circle is the only burnt out cap that i replaced. The blue circle is where im getting the hissing sound from.

I turn on the screen, get the high pitched hiss, the screen goes blank after a couple of seconds, the hissing stops. If i do this in the dark, i can actually see the wires leading from the board glow a blue/purple colour, this is accompanied by a chemical burning smell. I havent messed too much more than this, i understand that the currents involved could be tremendous. Does anyone have an idea as to whats happening ? is there such a thing as a dead electrolytic cap that doesnt show obvious visual cues ? Any advice is very welcome.

Thanks in advance.

[freakaftr8]

Re: Dell 2208wfp hissing

Does the hissing happen when the wired are disconnected? First I would try one plug at a time to see if the bulbs light in that socket. I would say you have a direct short bulb socket to ground to cause this.

[reabbott]

Re: Dell 2208wfp hissing

I messed a little more. I plugged each bulb into their own sockets, same result, i plugged swapped them around (so bottom bulb in top socket, top bulb in bottom socket) and i get the hissing from the same wires, not the same socket. So this points to the problem being the actual bulb and not the socket. I have never replaced a bulb and would be quite sure that repairing a bulb probably isnt possible.

[drpj23]

Re: Dell 2208wfp hissing

Bulb replacement isnt impossible, you just have to be careful for they are very fragile. If you cannot find replacements find a busted LCD and steel the bulbs out of those.

And to your first post, caps can definitely be bad without a visual sign (such as bulging).

[budm]

Re: Dell 2208wfp hissing

Yes, the Dell 2208 with bad lamp wiring and also bad transformers, fix about a dozen of these, all with bad wire that just barely hanging on to the lamp's ends.
http://s807.photobucket.com/albums/y...cpZZ1QQtppZZ20

[heavymachines]

Re: Dell 2208wfp hissing

Also wanted to mention you can get bulbs of any size you want from www.ccflwarehouse.com/ I have had no issue with their bulbs...and also on that note the first few you change are a pain to do but after you do a few of em they do get easier....

[heavymachines]

Re: Dell 2208wfp hissing

Also the very first two i have ever done i destroyed due to slightly ripped tabs be very careful of those tabs when you unsnap the frame... I learned the hard way, you may wanna practice on a monitor you don't care about, like a little 15 incher er something.... and if you get it back together without lines in the screen you have done well...

[reabbott]

Re: Dell 2208wfp hissing

Awesome replies, and thankyou for the photobucket. I pulled the bulbs out, slowly, broke one of them. The ends didnt look burned like yours did though, ill pick up some replacements from the cflwarehouse and attempt my first bulb transplant I found the same screen on ebay with horizontal lines, i could in worst case scenario, buy that, and swap the lcd panel with my good panel. Experiment continues with the aid of your photobucket !

[heavymachines]

Re: Dell 2208wfp hissing

Also wanted to mention you can get bulbs of any size you want from www.ccflwarehouse.com/ I have had no issue with their bulbs...and also on that note the first few you change are a pain to do but after you do a few of em they do get easier....

and if they don't have the size they will make it for you.....

[Bosse100]

Re: Dell 2208wfp hissing

@reabb0tt
Dit you solve the problem ?