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Previous Next. Jeff7 Lifer. Jan 4, 41, 10 I thought it was a fan going bad, but I'm sure it's not, having stopped every single fan in the system. Sound is definitely coming from the power supply. Audio sample, with background noise Audio sample, with bandpass filtering Audiography thingy Is this damn thing dying already?
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Joined Apr 7, Messages 1, At least I think it is coming from that direction. The location of the sound is somewhere around the cpu to power supply. When I turn on PC 2 in my sig, it boots up fine with no chirp noises. If I stress all 4 cores, it will start chirping.
If I stop stessing the cpu, the chirping goes away immediately. The sound is a high pitched whine that goes in and out. Not sure if it is the fans causing it. Another odd thing is that after stressing the cores for around 5 minutes, the chirping just goes away and won't come back till I restart the computer. The power supply and video card are old ones that I have used for years without an issue.
BillR Born Again Cynic. Joined Feb 17, Messages 18, Crucible said:. It is a high pitched noise that can last from 2 seconds to a. It sounds like a capacitor. It lasts longer when I first use full load on all 4 cores.
The chirps get shorter and happen less often over time and eventually go away within 5 minutes.Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles. Most of the time our AC adapters and power supplies tend to be quiet, but what does it mean when one makes a whining noise? Should you be concerned? Photo courtesy of Bart Everson Flickr.
SuperUser reader Rishat Muhametshin wants to know why some of his AC adapters and power supplies make a whining noise:. However, I often hear a whining noise from some of these power supplies. This happens most often when they are not connected to a device or otherwise in use, and stop making noise when I connect a device that is not fully charged. Why do some AC adapters and power supplies make this whining noise? Why do some not make this noise?
Is there anything that I can do to suppress it? First up, DragonLord:. Most power conversion devices contains coils, such as transformers or inductors. These components use electromagnetism to convert AC main power to low-voltage DC power.
The varying magnetic fields generated by these components can cause them to physically vibrate at high frequency, resulting in a high-pitched noise. Most modern AC adapters are switched-mode power supplies. The internal switching frequency of an SMPS is typically low when unloaded and increases with a load up to a certain point depending on the design. The no-load frequency is often low enough to be within the human hearing range. Together, these can lead to audible noise especially in cheaper units which fail to suppress this noise.
Under a load, a properly functioning SMPS should operate at a frequency well above the human hearing range, typically 50 KHz or higher although some older designs operate at 33 kHz. However, the same noise can occur under a load with a poorly designed or defective power supply as the coils may vibrate under electrical stress at a sub-harmonic frequency.
Power supply unit (computer)
The glue helps reduce the vibration and noise the coils generate during normal operation. Of course, this means that a user can apply glue onto coils using a glue gun to suppress coil whine—and yes, people have done this successfully with PC motherboards, graphics cards, and power supplies. However, you generally cannot do this easily on small wall chargers of the sort you mentioned without risking damage to the charger or exposure to potentially dangerous voltages.
In conclusion, a whining noise is not necessarily a sign of trouble in cheaper wall chargers when they are unloaded. However, a computer PSU or laptop charger that generates coil noise, especially when under a load, may be defective and you may want to consider replacing it. More information on coil noise can be found in this Wikipedia article. As the magnetic field increases and decreases generally about a thousand times a secondthe force of the field causes the dimensions of the coil to change slightly, and this vibration leads to a whining sound.
Even the wires on a printed circuit board can whine slightly under the right circumstances. Have something to add to the explanation? Sound off in the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.
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Preface: I know these walmart black friday tv's are real piles of crap. Took the cover off and it seems to be originating in or around the bottom right transformer. I believe I tested all the diodes I could find, including the surface mount ones on the back and any that were 0.
Same with the mosfets. Also I'm not sure what they're supposed to be because it's not marked anywhere that I've seen. The 3 caps near those output pins are all v caps so am I right to assume they're probably supposed to be higher than 12v or 24v?
I don't know anything about LED tv's or their driver circuits. I haven't replaced any components yet. Any help, guidance, or a hyperlink toward some would be greatly appreciated.
Thank you! I do have a DMM. I tested most if not all diodes.
I just double checked the ones i've boxed in red in this picture, are these what you'd consider output diodes? I noticed the SMD diodes that are situated near multiple resistors tested bad in circuit but after removing them i see they're good. Ok now that you have tested the diodes you need to check the primary fets and there respective resistors. Usually a tick tick tick in a transformer means that there is a short on the output side off it. Most of the time it is a diode, but also could be a shorted cap or something else causing a short.
That is why the input circuit of the transformer tries to start, but it gets shut down again. Hence the tick tick tick. The Bottom right transformer is the power supply for the main board, what happen if you remove the flat white ribbon cable, will it is still ticking?
More In depth trouble shooting required, you will have to start checking the load resistance of the power supply outputs to see if any one of them show very low resistance. You will need to look at the bottom side where the connector CN is to see which one are the power pins. I am sure that there is a short somewhere on the output side of the transformer and oops for some reason there is!
Oh wow you're right. I hadn't noticed the labels before but now they jump out at me. A 2nd pair of eyes on a problem is invaluable! I'll do some prodding and report back. Page 1 of 9.Why is my laptop's AC adapter chirping? I just noticed my laptop's running off its battery even though it's plugged in. When I picked up the adapter the adapter is HP branded and only a few months oldthe box was making an audible but faint chirping noise.
When I pulled the plug, the chirping stopped. It's not at all hot. Google says I need to replace it, but how and why is it making that noise? Some circuit has gone bad and it makes that noise for the same reason old flash cameras made "the charging noise". It is one of the ways power supplies fail. Sounds like you'll need a new adapter. Inductors can do that, too, when they are failing. Get a new adaptor pronto. Don't plug it back into your laptop - you don't want it to disasterously fail and fry your laptop.
When a cap or inductor fails, it cannot "store" energy. This is critical in case there's a surge or a noisy power line; whereas before the cap or inductor would act like an electrical cushion, now it goes straight into the laptop's much more sensitive electronics. I didn't plug it back in, and the store replaced it since I still had the receipt.
Is it a side effect of electricity passing through it? Is there a built-in chirping speaker to let you know when it goes bad? Sadly, there is no such fail-warning speaker system.
In the case of electrolytic capacitors it's the sound of the electrolyte venting out of tiny openings in the metal case. For inductors wire-wound ones the noise is because the coil is subject to resonant frequencies.
Certain combinations of voltage and load will cause the coil to resonate and produce high-pitched sound. An alternating current in an inductor will cause a changing magnetic field, and thus changing force on the wires.
Why Does a Hard-Wired Smoke Alarm Chirp?
Ordinarily the wires are glued in place, so they don't move. But if the glue is starting to fail, the wires will vibrate. In switching supplies the frequency is usually pretty high multiple kilohertz so if the inductor is failing it manifests as a singing or chirping sound, not as a 60 Hz hum. Fancy documents on the fly? This thread is closed to new comments.
Video: Why might my APC Back-UPS Product be beeping?
Tags ac.So, i just went out and purchased a power supply; the fan comes on but it will not power up. It is important to list the model of the computer. Different beeps codes mean various problems. My HP computer is working OK. But every once in a while, the power supply will beep. Sometimes the green light on the power supply will blink on and off while beeping. Pushing on the switch on the power supply will stop the beeping. What is the power supply telling me?
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New member. Message 1 of 5. HP Recommended. Tags 2. Tags: Archived. Level Message 2 of 5. BTW, the beeps are from a ultra-mini piezo speaker on the motherboard. This system is feedback driven thru Solution and Kudo flags. It's the only means of knowing if you have been served.
A UPS also protects you from computer damage. All plugs on a UPS function as a surge protector, preventing sudden bursts of power from damaging or destroying your computer hardware.
Brownouts can still cause hardware damage in some cases, however, including the loss of data on hard drives. Most UPSs are designed to keep computers operational only for a short period of time, not for prolonged use. A constant beep every second or two, and never stopping generally means the UPS is very low on battery power, and you should shut down immediately.
Give your IT team a call or send them an email and let them know they need to come take a look at your UPS. Like anything with a battery, they do need replacement periodically. To learn more about how WingSwept can help your business protect its data and increase your return on your technology investment, call us at Increased productivity.
Reduced risk. What is a UPS, and what does it do? Why is the uninterruptible power supply box beeping?