TV Making High Pitched Noise and Won’t Turn On

It’s normal when your TV produces some soft crackling, humming, or clicking noise. However, you may notice the pitch of the noise is rising. You may be in the middle of a Netflix series, and the TV produces a high-pitched noise, and then the screen goes black.

It’s a cause for alarm because something from within is wrong. However, you need some hands-on skills to diagnose the problem. If you have never encountered the issue or have no idea of the concern, it’s good to call an expert to diagnose the problem.

There are a few reasons why your TV makes high-pitched noise and won’t turn on. We will check the possible causes, how to diagnose the problems and how to fix them.

Three Types of Noise a TV Make

In normal circumstances, the TV may make some noises. However, the noise is soft and bearable. If the noise is high-pitched, it’s a symptom of an internal problem. Below are the normal noises a TV can make.

Humming

 When you switch on the TV, the fan triggers air circulation, which results in humming. It will also produce a humming voice when the air in the filters cools the TV.

Squealing Noises

When transformers and power inductors’ windings and cores become loose, they produce an irritating and squealing noise. You can fix the problem by spray painting the squealing part. If you hear the noise when the TV set is off, then the problem is with the power supply. The problem doesn’t necessarily have to be from the power source. The noise is a sign of shorted components that cause a power surge to your TV.    

Clicking

When power flows to the capacitor from the power supply, you’ll hear some clicking noise. The noise starts when you suddenly activate the power when switching on the TV.

Crackling

An electrical charge may cause some components of the TV to expand. When it happens, you may hear some crackling noise. The noise is normal when the crackling is soft. However, if the crackling is high-pitched, it could mean some damage to the power supply or the capacitors.

TV Making High Pitched Noise and Won’t Turn On Causes

TVs have become complex as technology advances. It’s harder for a non-expert to diagnose and fix minor TV problems. However, you can detect some problems with the capacitor or the power supply.

Although you may not do repairs on your own, It helps you take proper action and seek help from the right people. The capacitor and power supply are the main reasons a TV may cause high-pitched noise and won’t turn on. Let’s check how the problems occur.

TV Making High Pitched Noise and Won’t Turn On

Faulty Capacitor

When you switch on the TV, the capacitors receive the power supply first before other components. They store the power and transmit the power needed to other TV parts. It protects other elements on the board from power surges. When one or more capacitors in the circuit are faulty, the power supply will terminate, making a high-pitched noise. Since there’s no complete circuit, the TV won’t turn on.

Power Supply

Like other electrical appliances, a TV needs a direct current to operate. However, the sockets have alternating currents. Thus, the TV uses a rectifier circuit to convert alternating current into direct current.

This conversion happens at the relay switch. If the switch is faulty at activation, the TV doesn’t get enough power supply, resulting in high-pitched noise.

Blown Fuse

A fuse protects a TV set from an unexpected power surge. However, it may blow and interfere with the normal performance of the TV. In some instances, the TV won’t turn on. You may experience the TV’s black screen of death when it blows. It’s difficult to diagnose the problem when you don’t know electronics and electricity. You can solve this by checking fuses and necessary replacements. Once a fuse in your TV blows, you should check the power source and replace the power strip before replacing the fuse. 

TV Making High Pitched Noise and Won’t Turn On Fixes

Once you troubleshoot the cause of high-pitched noise in your TV, you fix the problem according to the cause. There are two major reasons for the annoying noise, as we have seen above. Below are the steps you should take to fix the problem for each case.

Fixing Noise Due to Capacitor

When a capacitor breaks down, you’ll need to replace or repair them depending on the extent of the damage. The TV screen is delicate; thus, you should hold the TV set with care.

Start by examining any damage on the TV and the screen. If there are any faults, you should take them to an expert. Call the manufacturer or the seller for repairs if it has a warrant. However, if the TV was okay before switching it off the last time, you can proceed and fix the issue.

Collect tools like pliers, screwdrivers, wire cutters, solder, soldering iron, replacement capacitors, etc. ensure that the replacement capacitor matches the original capacitor on the TV. It would help if you got a new capacitor from your TV manufacturer to ensure safety.

Switch off the TV and unplug the power cables. Unscrew the TV from the stand or the wall and move it to the working table. Ensure the working area is well lit.

Lay the TV flat on a soft surface. Ensure no object can press the screen as it’s prone to damage. Unscrew the case to access the TV’s motherboard and the capacitors. Ensure you unscrew all the screws that attach the case to the TV.

Gently remove the case and set it aside. Observe all the components so that you reassemble well once you finish fixing the capacitor. Detach all the wires that connect the circuit and the TV. Also, remove the circuit board by removing all the screws.

Observe all the capacitors to check the faulty ones. Some may change color while others leak. However, the first sign of a faulty capacitor is bending.

Gently detach the faulty capacitor from the board. Don’t force the capacitors out as it may damage the board. Replace the bad capacitor with a new one and ensure they are the same size and capacity.

Secure the wires back to their positions. Fasten the screws and return the TV case to its position. Plug the TV and switch it on to confirm the noise is no longer there. If the problem persists, involve a professional.

Fixing Noise Due to Power Supply

If you suspect the problem doesn’t come from within the TV, you should inspect the power supply. Switch on and off a couple of times to determine the need for repairs. Use the manufacturer’s guide to handle the repairs. If you misplaced the manual, involve a professional.

Start with shielding yourself against electric shock by wearing an antistatic wrist wrap. Please switch off the TV, unplug the power cables, and let it cool. Attach the power plug to a surge protector before returning it to the wall socket. If the steps don’t correct the noise concern, you should call an expert electrician for repairs.

Conclusion

When your TV makes high-pitched noise and won’t turn on, it has a problem with the power supply or the capacitor. However, other reasons may cause high-pitched noise. For instance, the noise may come from the vibration of parts like the coil, choke, deflection yoke, Ferrite beads, or the horizontal flyback transformer. These parts produce noise after long exposure to fluctuating current and inevitable deflecting current.

Other reasons may be third-party components, interference from the loudspeaker, or the position of your TV. However, these reasons do not prevent your TV from turning on.

 

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