I have a Princeton brand LCD computer monitor that is approximately two and a half years old.
The problem: when the monitor is on, it makes a high-pitched "whistling" or "whining" sound that is very obnoxious. The only way to make it stop is to adjust the brightness and/or contrast to a lower level. It will only stop making the noise when the brightness is adjusted down to almost 0%. Then, the higher you adjust the brightness and contrast, the louder and more high-pitched the noise becomes.
Most recently, when I turn off the monitor, the entire screen goes completely bright white and the whistling noise is louder (so it is not actually off). Leaving it "off" for an extended amount of time does not correct the problem.
I have been having these problems for 6 to 8 months. The monitor made no noise when it was new, and it powered off correctly.
My resolution is at 1024 x 768 and my refresh rate is at 75 Hertz. Adjusting either makes no difference. Please help!
LCD Monitor makes Whistling Noise
Fri, 01/20/2006 - 13:55
#1
LCD Monitor makes Whistling Noise
Mine is doing about the same thing! I would leave my comp on for days at a time before and it never used to do that. Now, when my comp monitor turns off after 20 minutes of inactivity, and I move my mouse it shows a bright white and I hear a whistle. I don't know what is the exact problem but I'm googling it to find out.
Sounds like Bad Electrolytic Capacitors in Power Supply . if any cap has a Puffed top "Domed" replace it Stay with same UF But can use a higher Voltage cap Like if cap is 1000uf/16v can use 1000uf/25v if theres room .
So do I just get/use another power cord? It may be my power cord. I think I'm using the power cord that gave me problems before.
The Power Supply is inside the Monitor You will have to remove the back from the monitor to get at the Power supply .
So remove the back to get into the power supply, then what do I do next? Would it be cheaper and worth it to fix it on my own or send it to a repair shop? Or would it be cheaper to just buy another one?
Replace any BAD Electrolytic Capacitors !
Whre can I buy those? Are they cheap or worth fixing or would it be cheaper to buy another monitor?
Actually , any time I have had this problem with a monitor it was bad caps in the ballast circuit. Most folks do not bother to repair the computer monitors tese days.they buy new ones. That is how I got my 22" widescreen I am using now. It was replaced for less the 200 bucks by the original owner.
They will be swollen on the tops or you will need to check them with an ESR capacitor checker. This is not a job for the novice I'm afraid because of the high voltage on the ballast board. Good Luck
I opened the monitor, took a look at the power supply and whadda ya know, found two bad capacitors. I know nothing of computer monitors and more of the computer hardware so I decided ehhhh I'll do it myself and take a look. The two bad capacitors are puffed on the top and not flat as the other ones, and it looks like one of those double A batteries that leak out liquid and dry up when they go bad. I'll try and find replacements. Does anyone know if this would be an easy labor replacement? Or will I need to hand it over to a 'professional'? Will I need special tools and/or some other special knowledge to replace it on my own?
I'm more of the girl who LEARNS to fix things herself and save money, rather than to spend money on something that I can be capable of doing and learning.
What do you mean, 'if there's room'?
The two bad capacitors on my power supply indicates 1000uf/10v. How far up of a voltage can I go?
if there 1000/10V replace them with 1000/16V you will need a solder iron and some solder rosin core you can get the caps at www.mcminone.com Part # 31-6995 what i ment about if Room the higher the Voltage the Bigger or fatter the cap gets
Thanks to dwray and larry for the great information on how to get my monitor fixed. And thanks to my husband for soldering the new capacitors for me, I knew he had all these tools and stuff to accomplish a successful replacement. =P
You guys are awesome! I got my monitor fixed and functioning like it's supossed to! No more noise, no more white screens!
Forgot to tell you Make sure you Put the NEW caps back just like the old ones were On the Caps there will be a dark band thats the - Neg side make sure its pointing the same as the old ones best to take a picture of the caps before you remove them so you know which way to put the new caps back in the same way
Glad to Hear you Fixed IT For much less $ then replacing it with a new monitor .
I researched all throughout the internet on the do's and dont's on replacing a capacitor before my husband and I started to do anything with the inside. So I made sure I knew that I can be able to handle the replacement on my own and instructing my husband on how to replace it. I also watched youtube videos on what happens when you place the capacitor backwards. Scary! When my husband was done soldering the capacitor, I asked him "Do you trust your work?" Hahaha because of the youtube videos I watched, I don't want anything blowing up in my face.
Yes dwray! I only spent $3.45 for the two new capcitors. We don't usually spend on things like a soldering gun, but my husband finds alternatives to get the job done. So far, so good, still satisfied, and I trust my husbands work on it.
great news that you fixed it. did you happen to take any pictures? i like to take pictures and the details and give folks a how to with pictures. Again Congrats on a job well done!
Nope. Didn't have a chance to take pics, or I didn't give myself a chance to take pics. I was so eager to see if my husband and I fixed it or not. I should've took pics of the process we went thru on the replacement. It would've helped other people looking to DIY.
Remember for next time we like pictures!
sleep apneia here. bad time sleeping through the night somtimes.
I'm always up late. I'm always online. I'm a member of more than 30 forums all over the net. I tried to shut the internet outta my life once, and that didn't work. Hahaha.
Hi Larry and xlovergirl,
I've been not so fortunate here, I cannot spot any leaking capacitors (even the big blue one is fine):
However, after using a piece of cardboard to try and isolate the sound, it seems that the big yellow guy (I think this is a transformer) is the one that's whistling... if this is at all possible.
SPW-059 F3
LSE-B3 0639 A
The whistle change pitch depending on whether the screen is off/power safe/and resolution (and I have isolated the whistle to the power supply board). Also when I use a stick to poke the square enclosure around the yellow cylinder the whistle pitch changes dramatically. When I unplug the power, the whistle gradually diminishes over about 15-20 seconds.
Is there any way to test if it's really the big yellow guy? If so, can it be replaced? If so, where do I buy a replacement? If this is possible, can I buy only one of them?
Thanks,
Nick
that big yellow one is a transformer and this is a very common problem, you could maybe try to push very carefully as you could crack the board Popsicle stick between the metal frame and the yellow part and see if that makes less noise? the noise is a vibrating winding on the transformer. age shrinks the transformer coil and then the windings on the coil will sing and make a very annoying noise.
Larry Dillon.
Oops! Haha, I cracked the transformer frame...
I could buy a broken monitor for £40 inc shipping (but they're about £100 second hand). Or I could buy a new monitor for £130...
Such a shame I can't find anywhere that sells the transformer; I doubt they're made to order by Dell, or are they?
I just bought a "broken" monitor of the same type, so hopefully I can use the transistor (or maybe the entire power board) from this.
he entire screen goes completely bright white and the whistling noise is louder (so it is not actually off). Leaving10.4 inch LCD
it "off" for an extended amount of time does not correct the problem.Leaving it "off" for an extended amount of time does not 10.4 inch LCD monitor
correct the problem.
The only way to make it stop is to adjust the brightness and/or contrast to a lower level. It will only stop making 10.4 inch LCD monitor
the noise when the brightness is adjusted down to almost 0%. Then, the higher you adjust the brightness and contrast, the louder10.4 inch LCD
and more high-pitched the noise becomes.
The whistle change pitch depending on whether the screen is off/power safe/and resolution (and I have isolated the whistle10.4 inch LCD monitor
to the power supply board). Also when I use a stick to poke the square enclosure10.4 inch LCD
around the yellow cylinder the whistle pitch changes dramatically. When I unplug the power, the whistle gradually diminishes over about 15-20 seconds.
Most recently, when I turn off the monitor, the entire screen goes completely bright white and the whistling noise is 10.4,inch,LCD
louder (so it is not actually off). Leaving it "off" for an extended amount of time does not correct the problem