Question about Televison & Video

2 Answers

Buzzing noise in the back of the tv - Televison & Video

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,667 Answers

This can be coming from any of the components that use windings, such as inductors. These are generally located in the power supply and in the case where display tubes are used, these would be in the scan amplifier sections.

In the case of a projection and regular CRT type TV, there will be deflection yokes for the tube(s), and there will be induction coils used in the scan amplifiers.

As the coils age, their internal windings, especially on the outer layers may loosen up a little. Sometimes in the coil's construction there may be some resonance with the core of the coil if the core is a metal type. Sometimes if any of the bypass or decoupler capacitors start to go open with age, and the capacitors are used for noise suppression for an induction coil, the coil may start to make some audible noise.

If some outer windings of induction coils are getting a little loose this is generaly not serious. If there are capacitors going off value, this can lead to problems.

With these induction coils, depending on the layout design and the overall component design, there may be some audible noise generation from the coils.

The coils are reactive devices. They work with electro-magnetic fields between the windings, and in conjunction with their core if they are using a metalized core. When these coils operate in their related circuits, there are generally some type of electrical signal or modulation being applied through them. Normally these frequencies are outside of the audible spectrum. Because of sub-harmonics that can be generated it is possible that you may hear some resonance.

There are also other mechanical factors involved in dealing with any metal shielding in close proximity of any coils that are being driven. The high frequency magnetic fields can react with nearby metal shielding, and thus the shielding acts like an acoustic resonator for the coil.

Someone who is very familiar with this type of noise problem can service this. It can be a very time consuming job if there are modifications and mechancal fixes that have to be done. It is important to first determine that there are no faulty components in the first place that are contributing to the noise generation. With most TV sets, as they age the problem may become worse.


Jerry G.

Posted on Sep 27, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 8,617 Answers

I would need the model number in order to help you. Please respond to this same post with the model number and I will try to assist you.

Posted on Sep 27, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

NS-LDVD32Q-10A buzzing noise


Try another input and another source such as a DVD player. If you still get the buzzing sound, you could have a faulty power supply output or a fault in the audio circuit of the main board.

Jan 27, 2013 | Insignia NS-LDVD32Q-10A LCD TV

2 Answers

I have a proscan 42LA45H 42 in television that has started making a buzzing noise from the back. What is causing this, and what do I need to do to fix.


Hi
If picture and sound is Ok, and only this buzzing sound is heard from the back of the TV, It should be due to core soose of some ferrite cored transformers inside, especially to the power supply regulator board of the TV. Open the back cover of the TV and swtich it ON. Listeen very carefully which transfromer makes the buzzing noise. Just trouch and press the core of the transformer suspected with some non-cunductive material like glass rod, or a stick of dry wood. You can identify the transformer that makes noise by this way. After identifying the exact transformer; switch OFF the set, unplug it from mains socket, apply some "Super Glue" like fast boanding glue to the joint of core of that transformer. Allow sometime for the glue to set. This will solve the buzzing sound problem of your TV. OK

Jul 13, 2011 | Proscan 42LA45H 42 in. LCD TV

1 Answer

TV started making a buzzing noise at start up which gradually got worse ovre time until it would not shut off unless unplugged.


This tv unit have a colors wheel design into it.This tv problems,having loud squeling,buzzing noises or colors pictures are flashes black&white with the pictures.The tv colors wheel it is worn out and it is dying.The tv have a loud buzzing noises because the tv colors wheel it is worn out and warping out of it axis and it is spinning and hitting it steal frame box.The tv colors wheel sit way back of the tv behind many mechanical parts.Have no experience in mechanical works like take things aparts and putting it back again.Hire a tv tech. to change the colors wheel.

May 03, 2011 | Samsung HL-P5063W 50" Rear Projection HDTV

1 Answer

Buzzing/fizzing noise from back of sony flat screen tv


Below is an image of rear side of your TV, Sony KDL-40W5500
Top right corner is marked there and possible cause of noise seems back light inverter board, there are high voltage going to CCFL inside LCD panel and seems high voltage leakage causing that buzzing/ fuzzing noise.

Replace back light inverter board upon voltage leakage confirmation.
Thanks.

bd073ee.jpg

Oct 23, 2009 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

1 Answer

Samsung 4663w rear projection tv loud buzzing


Hai,
Buzzing can be caused by a bad ballast, colorwheel, or cooling fan... Nothing else makes a noise, unless it's comming from you speaker.

Hope it Helped U!

Aug 04, 2009 | Samsung Televison & Video

1 Answer

LG 37LP1D - Buzzing niose coming from TV


I blew condensed air through the ventilation holes in the back of the TV, which greatly reduced the buzzing noise.

Mar 03, 2009 | LG 32LX1D 32 in. LCD Television

1 Answer

Toshiba 36zp18q buzzing noise.


Humming sounds come from the power supply and buzzing sounds come from other circuitry. Most likely a capacitor somewhere.

Feb 18, 2009 | Toshiba 36A40 36" TV

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

358 people viewed this question

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

72601 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

6694 Answers

yadayada
yadayada

Level 3 Expert

70346 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...