5 Ways to Tell if Your TV Power Supply is Bad

A Power Supply is arguably the most important factor for a functional TV. Your power supply could be the cause of most of the problems that you face with your TV or LCD.

TVs and LCDs are one of the basic features of every household and office. But the sad part is the manufacturers don’t offer enough warranty on them. At maximum, you can get 3-5 years of warranty only when you buy a new TV and to be honest, that too is not enough.

A TV power supply is a component that is responsible for distributing power to each and every component of the TV. Ideally, you will find the power supply of the TV in the middle part of the body but it depends on the make of the TV.

This also means that any problem in the TV power supply can cause the malfunction of any component. For instance, a person might think that their TV screen needs a replacement because it is acting weird, for instance, a flickering TV screen. But when they get a replacement, the problem is still there. This is because it’s actually the power supply that is causing the problem.

So, before you fall into the trap of unnecessarily spending on a new TV, we got you covered. In this article, we will discuss the 5 most common ways and signs to tell that your TV power supply is bad or malfunctioning.

Testing the Power Outlet

First of all, you need to be sure if it is your power supply or the power outlet that is causing the problem. For this purpose, follow these simple steps.

  • Unplug the TV.
  • Try connecting the TV to an independent power source such as an Uninterruptable power supply.
  • If the TV works fine and your problem is solved, it means that it is actually the power outlet that is causing the problem not the power supply of the TV.
  • You can easily use an electric circuit breakage finder (pictured below) to check the fault in your power outlet. It’s a very useful and handy tool.

Lines on the Screen of TV

This is one of the most common indicators of a bad power supply or outlet and scariest too. Most people think that this means that their screen has issues. Well, that’s not always the case. Such a problem can also arise when your screen is not getting enough power from the power supply due to some problem in the power supply. 

 Here’s what you can do to try and fix it.

  • Turn of the TV.
  • Wait for about 15 minutes and then turn it on again to see if the problem is still there.
  • If you have the latest Android TV or HDTV, you should also try to reboot it, that might be the solution.

Dead TV Screen

Dead TV screen, black TV screen, or blank TV screen, it’s all the same issue with many names. If this is the issue that you are facing with your TV, this might be a little bit problematic.

In few cases, this also means that your TV is just too old and it’s almost at the end of its life span. This might also be because of the failure of backlighting. To fix this you need to call an expert to replace the backlight.

Another likely cause for this problem might be the power supply. This might be due to some faulty capacitor or invertor which you need to replace to get your TV back in good condition.

No Sound coming from the TV

This is another very common problem that you might face. Sometimes you cannot get any sound from the TV. This might be due to a problem with your TV speaker. It’s very likely that the speaker component is not getting the required power supply which signifies a fault in the power supply.

Another possible reason could be that a Bluetooth headset might be connected to your TV due so you are unable to get any sound.

These are few steps that you can try to fix the problem

  • Increase the volume to full and see if you can hear any sound.
  • Turn off your TV and turn it on after 15 minutes to see if the problem is solved or not.
  • Make sure that if you are using external speakers, they are properly connected to the TV set (check both Bluetooth connection and wired connection)
  • Make sure that your TV is not on mute or some headset is not connected to the TV.

If all these steps do not work the problem might be due to a malfunctioning sound system or power supply. You can call an expert to check on that and replace it.

Use a Multimeter to Diagnose

How to to Tell if Your TV Power Supply is Bad using multimeter
Image Source: Alaa Alhomsi

This is one of the best methods to get a definite diagnosis of your power supply. You can use a multimeter to check the different pins of the power supply and make sure that each of them is working fine. A multimeter (pictured below) is a diagnostic device that you can easily get from a local store.

These are the steps to follow while testing your power supply with a multimeter.

Other Important Factors to Note

  • Safety precautions are most important. Make sure that you are following all of them.
  • Connect your TV to a power outlet to ensure that the current is flowing through it.
  • Turn on the multimeter and switch it to DC with a range of 10v.
  • Test each pin on your power supply separately and note down the values.
  • Now examine your data and see if you are seeing any overvalue or undervalue.
  • If you have any such anomaly, it means that there is a fault in your TV power supply and you need to get it replaced.

Here is a link to a very useful video that you can watch to get help in testing your power supply.

This was all about 5 Ways to Tell if Your TV Power Supply is Bad. If you still have any questions, feel free to let us know in the comment section below.

If you want us to cover some other topic, you can also leave that suggestion in the comment section and we will be happy to help. 

3 thoughts on “5 Ways to Tell if Your TV Power Supply is Bad”

  1. I hv a Panasonic TV. When I switch it on the green light comes directly then the cable picture comes and after a few seconds it goes off and the red light on the TV keeps going on n off

  2. My Visio (XVT553ST) was working fine until the power went on and off several times during a thunderstorm. The set was plugged into a surge protector which was and is working, however the set now turns on but flashes with some static back on and off. All other devices plugged into the surge protected power strip are working fine. My thought was that the power supply had been damaged in some way and not the main board. The flashes of picture that come on are good in usual great color and clarity, but flash off and on or go to a gray screen.. Any thoughts from you before I buy a power supply.


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