Hello everyone,
So... First, I am not an electronic enthusiast, I had few lessons in school several years ago but nothing really technical. No surprise if what I ask in this topic can be easy stuff for you
My previous monitor (LG W2252TQ-PF, an 21" LCD monitor without LEDs @ 1600*1050 / 16/10) died one year and half ago. Before dying and for a good week, he produced an high-pitch noise at specific situations (in sleep mode, even offline but power connected, and between resolution changes) and so I expected it to stop working, and he did. Unable to start it again, I stocked it somewhere and replaced it by a new one.
I wanted to repair it someday mostly by curiosity, and yesterday I finally got time and motivation to repair this old guy. I opened it, saw two bad capacitors but decided to replace nearly all of them (8, all Su'scon). Of course, I respected polarity/capacity, security
and bought some decent replacements (Panasonic for the most part). The only ones I didn't replace was the two 68µf @ 450v but they didn't look bad.
And he works again ! The image is fine in all areas, I don't see any problems BUT... he still produces the high-pitch noise he did before dying, in the same situations than before. Obviously, this sound is not coming from the capacitors or maybe from the 68µf ones I didn't replace ?
I can't pinpoint the exact location of the sound, the only thing I am sure is that it come from the power board, but as I don't want to get an accidental hurtful discharge, I prefer to avoid getting too close of it while it is working, now that he got some power in nearly two years
So I want to know your opinion of it, or if there is a way to know what can produce this damn sound offline.
(I attached an image of the power board. It is not my image, I found it in the web but it is exactly the same board. If needed, I can produce some...)
Cordialy,
So... First, I am not an electronic enthusiast, I had few lessons in school several years ago but nothing really technical. No surprise if what I ask in this topic can be easy stuff for you
My previous monitor (LG W2252TQ-PF, an 21" LCD monitor without LEDs @ 1600*1050 / 16/10) died one year and half ago. Before dying and for a good week, he produced an high-pitch noise at specific situations (in sleep mode, even offline but power connected, and between resolution changes) and so I expected it to stop working, and he did. Unable to start it again, I stocked it somewhere and replaced it by a new one.
I wanted to repair it someday mostly by curiosity, and yesterday I finally got time and motivation to repair this old guy. I opened it, saw two bad capacitors but decided to replace nearly all of them (8, all Su'scon). Of course, I respected polarity/capacity, security
and bought some decent replacements (Panasonic for the most part). The only ones I didn't replace was the two 68µf @ 450v but they didn't look bad.And he works again ! The image is fine in all areas, I don't see any problems BUT... he still produces the high-pitch noise he did before dying, in the same situations than before. Obviously, this sound is not coming from the capacitors or maybe from the 68µf ones I didn't replace ?
I can't pinpoint the exact location of the sound, the only thing I am sure is that it come from the power board, but as I don't want to get an accidental hurtful discharge, I prefer to avoid getting too close of it while it is working, now that he got some power in nearly two years
So I want to know your opinion of it, or if there is a way to know what can produce this damn sound offline.
(I attached an image of the power board. It is not my image, I found it in the web but it is exactly the same board. If needed, I can produce some...)
Cordialy,
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