Question about Televison & Video

1 Answer

Thank You Jerry G

That Toshiba (32AF43) with the high pitched whine after 5 -15 minutes of operation has dissipated. The TV was given to me, and it seems that moving it makes the loose winding or whatever worse. I am not a TV repair person nor an ET. A technician friend recommended applying some HV dope on the winding after finding the source. If the problem remains the way it is now, I'll just live with it; however, if it gets worse when the weather changes, I will take another look. I will be careful to discharge the tube and HV sources caps ... as I don't want to get shocked to kingdom come.
<>
Lastly, thanks for the advise. It seems right to me.

Posted by on

1 Answer

  • 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

I would not advise you to work on the TV yourself. Even discharging caps and the HV can be dangerous for you, and it can cause collateral damage if not done properly!

The winding sound can be from defective decoupling capacitors in the associated areas, and or the windings of the reactive devices are resonating, and or some metal shielding is resonating with the high frequency magnetic fields radiated by these devices.

This type of fault can come from the switching supply, or the the horizontal output stage. In these areas they are using high current and high voltage type transformers that are driven a ultrasonic range of frequencies. The resonance you are hearing is in the sub-harmonic range.

An experienced TV tech should be able to service this for you. When the electrical part is in spec and at no fault, the mechanical resonance can be difficult to fix.

Most of the cost will be for the labor to do the work.

Jerry G.

Posted on Apr 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

I have a magnavox 37mf331d/37 that has developed a high pitched whine.the longer the tv is on the louder the whine.the tv is 5-6 yrs old


It's likely a capacitor associated with the power supply having gone bad.
It's obviously beyond your expertise to repair it yourself.
Find a trustworthy repair shop and take it there.

Sep 05, 2012 | Televison & Video

1 Answer

High pitch whine when tv started then it lowers in pitch


That could be either the color wheel or one of the fans. try listening to which area of the set its coming from.

Apr 04, 2012 | Televison & Video

1 Answer

I have a samsung hln507 and there is no picture. we start the tv, it has a high pitched whining sound, the fan and the color wheel are spinning, but there is no picture. after about 10 seconds the tv turns...


The colors wheel is dead.That why,u hearing high pitched whining sound.The colors wheel is spinning off of is motor axis and grinding it sides walls,that where the high pitched whining sound came from.Hire a tv Tech. for the colors wheel changing,because it requiring to take out alots of the machanicals parts itself,before u can come to the colors wheel itself to change it.

Oct 16, 2010 | Samsung HLN507 50" Rear Projection...

1 Answer

High pitched whine/sometimes TV won't turn on


The power supply on this model will whine when it is shorted or overloaded - the set would have to be brought in to determine exact cause.

Oct 23, 2009 | Televison & Video

1 Answer

High pitch whining,


Ur flyback transformer it have cold soldier or is dead.U also could have prob. with ur power ic inverter board too.

Aug 16, 2009 | Sony KV-32S45 32" TV

1 Answer

Toshiba 32AF43 problems


bright red with lines left to right? would be shorted crt. shutting off would be normal due to high beam current.

Nov 09, 2008 | Toshiba 32AF43 32" TV

1 Answer

Samsung SlimFit 30" high pitch whining noise


I have had the same high pitch tone problem for several months after about 20 minutes of use. It is so bad it's rendered the TV almost unwatchable. I contacted a repair place from Samsung's website. I was told that is likely the flyback transformer. I don't know what it is, but it sounds cool like a flux capacitator. I was told it would be about $100 to fix. However, I have had very little luck getting the repair shop to order the part and do the work.

Sep 04, 2008 | Samsung TXR3079 TV

1 Answer

High-pitched whine


The wining sound is most likely from one of the inductive reactive devices. These can be chokes or tansformers in the scan circuits or the power supply.

There are very high frequencies used in the ultra-sonic range for the switching power supply, and the transition times for the scan amplifiers and high voltage section are in the ultrasonic range. What you are hearing is something that is resonating with the magnetic fields generated by these high frequency devices, and they are making sub harmonic sounds in the audible range.

It is possible that in one of the reactive devices there are some wire turns that are a little loose, or the coil form is not very tight to the core of the device, or one of the near by metal shields is resonating from the magntic field.

There is also the possiblity that the supply voltage to one of the reactive devices is not being properly filtered by a by-pass capacitor and its structure is resonating between the normal power drive and summing with the unfiltered supply to it.

When the set is first turned on it is cold. As it operates its internal temperature will rise. There is expansion and contraction of the various parts. The reactive devices are made with very close tollerance, and their physical characteristics can change enough to allow resonance. If the fault is from a by-pass capacitor, the capacitor may have become thermo sensitive and change its characteristics with temperature.

In the case of a resonating reactive device, sometimes it is possible to fix the problem by re-inforcing the winding to the core if it is accessable. It is not always accessable to do this depending on its design. Then the solution is to change the part. If it is a shield that is resonating, this is usually easier to correct. As for any defective capacitors, these can be easily changed.

It would be best to have a very experienced TV service man look at the situation and spend the time to make a proper evaluation of what the fault actualy is.

I have had this type of problem often. I was always able to find the solution and fix it. Most of the cost of the service was from the time it took to work out the solution more so than the cost of the part, unless it was a major part such as the flyback or the deflection yoke.

Flat panel displays have switching power supplies and are subjected to similiar types of resonation faults with their power supplies.


Jerry G.

Nov 30, 2007 | Toshiba 32A43 32" TV

2 Answers

Power light comes on, followed by a high pitched whine


Hi, If after trying the TV again later and problem persist, repairs are in order. A high pitched whine is an indication of a fault at the horizontal section of your TV. The horizontal provides the high voltage for the picture tube. Your best bet maybe to seek the services of a qualified professional TV repairman since this involves component level repair, soldering/desoldering, use of soldering iron and VOM (testers) and knowledge of circuitry. Good luck and kind regards.

Aug 20, 2007 | Toshiba MW30G71 30 in. TV/VCR/DVD Combo

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

Related Topics:

63 people viewed this question

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

72670 Answers

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

Level 3 Expert

6694 Answers

yadayada
yadayada

Level 3 Expert

70387 Answers

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

Answer questions

Manuals & User Guides

Loading...