I bought a brand new 20 inch Acer monitor about a year ago. When the monitor is in standby mode it has a whine that changes pitch depending on whether the standby led is on or off in the blink sequence. A quick Google search revealed that it is probably a capacitor that is either bad or is going bad. I have changed capacitors in the past, it is relatively easy. I hate to open the case on a brand new monitor just because of a noise, but it is loud enough to aggravate me constantly when the computer is off. I'm a crack this puppy open in a few days while I have time off. I may reach out to Acer and see if they will make it right instead, though.
A failing capacitor, depending on what its purpose in the circuit, could cause such symptoms, but the capacitor itself is very unlikely to be making the noise.
The circuit might even be operating normally and the noisemaker just has something that rattles around. If you open the case, think first about any transformers or coils that could be vibrating.
A few years ago, there was a capacitor plague amongst the computer industry resulting in lawsuits against Dell and others. Supposedly that was all sorted out. Maybe Acer got a bad batch of caps.
If you're going to order new caps, I would order from Digikey, Mouser or any other reputable dealer . They carry original manufacture parts and not fake ones. I'd stay away from eBay for capacitors. Believe it or not, there are some fake caps being sold out there that look like a reputable capacitor, but are not. I wouldn't want to take the chance of one letting out the magic smoke and exploding, destroying the traces on a pcb board or worse yet, starting a fire.
On that note, where do monitors go when they don't give a picture anymore.
About a week ago I was working on the computer and one of the 24in Dell monitors started getting dimmer and flickered a few times and went dark.
There are two more that have not worked since the lightning incident 18mos ago.
Dell does not even want them back or will comment on where they can be repaired, disposable items, they say.
I am going to part them out for the mini phone jacks and such before they are sent out.
There is no recycling setup within an hour of here that I can find.
:-S
We had to replace an Acer (I believe) monitor a few years ago that just quit working. I researched it, and it was a common problem.
Looks like Shotzie, my computer guru's dog. Suppose that's how he cleans monitors in his shop?
:{: :gammon: :}:
Oddly enough i have a Dell monitor that is acting up. When first turned on all you see is a scrolling image. Once warm it goes away. Googling says bad capacitors. Got new ones and going to own it up and see if i can fix it. Seems pretty by YouTube videos.
Have a Samsung TV monitor that lost a lot of pixels due to condensation that corroded the lines at the bottom of the screen. Put black electrical on the bottom and am a happy camper.