4 Common problems with LED TV and their diagnosis

led tv problem

Following are 4 of the most common problems with LED Televisions faced by customers worldwide.

LED TV screen goes blank

blank led tv screen

In this case, most probably the power supply unit inside the LED TV has issues. The power supply unit is responsible for receiving current and sending it to all the components of the LED TV. The power supply unit develops issues due to a sudden surge in input supply. Usually, the capacitors on the power supply boards fail. If you disassemble the LED TV set, you could verify this by spotting a leaking or bulging capacitor. These problems are common in modern LED Televisions and the repair work is fairly simple and quick. It is recommended to find a technician as replacing the capacitor would require soldering skills.

LED TV has Horizontal lines on start-up

In this case, the root of the problem is low signal strength in the set-top box cable that is connected to the LED TV. This problem might not show up if you plug that set-top box to an old television. The reason for this is that older TV sets required lower input strength to work. With the modern LED TVs set it’s not the case. They require stronger input signals. Thus, switching to an HD set-top box will most probably rectify the problem.

LED TV with no sound output

Disconnect the LED TV from the AC power, then press and hold the power button on the LED TV (not the remote) for 10 seconds. After waiting for a minute, connect the TV set back to AC supply and press power button once. Then try out other “sound out” from your TV to a set of speakers. If the speakers work, clearly the internal TV speakers are not working. If it doesn’t, it is most likely that the audio IC that drives the internal speakers has failed. It is common in these sets as they use inexpensive low powered amplifier ICs that heat up and fail. A simple replacement of the audio IC will do the trick here.

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LED TV not connecting to WiFi

The first step is to locate if the problem is in the TV  or the router. If the TV has no problems in connecting to your mobile device, then probably the router is at fault. Try updating the firmware of the router. If that doesn’t work, factory reset the router. This should do the trick

You could also borrow a WiFi extender and test if the TV connects to the internet. If the signal strength is not the issue consider getting a USB wifi adapter for the LED TV.

Here are some good WiFi extenders and USB WiFi adapters available on Amazon, via reliable sellers,  that could help you resolve the issue:

Wifi Extenders

  1. TP-Link TL-WA850RE N300 Wireless Range Extender 
  2. Mercusys MW300RE Wireless Repeater WiFi Booster 
  3. TP-Link Deco M3W AC1200 Whole Home Mesh Wi-Fi System Add-on Unit, Wall-Plug Extender, Work with Amazon Alexa, Router/Wi-Fi Booster, Parent Control, Qualcomm CPU 
  4. Netgear EX6110 AC1200 WiFi Range Extender (White) 
  5. D-Link DAP-1610 AC1200 Wi-Fi Range Extender 
  6. Tenda A301 V2 Wireless N300 Universal Range Extender/Repeater 

WiFi Adapters

  1. Tenda U3 Mini Wireless N Adapter (Black) 
  2. TP-Link TL-WN821N 300Mbps Wireless N USB Adapter (Black/White) 
  3. YGS® HDMI/WiFi Receiver 1080P TV DLNA Wireless Dongle (Black) 
  4. Rampotox TV Dongle Receiver Wireless WiFi 1080P Full HD HDMI Display Supports Windows iOS, Android Black 

For any there queries regarding LED TV problems, please feel free to comment in the section below.

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19 Comments

  1. 1

    I have a 32 inch LED TV C-3200 model which is showing blink once on the screen when the power is ON. can you suggest me what may be the problem and how it can fixed?

  2. 2

    I faced a lot of such problems with my first ever Samsung 3D TV 7-8 years ago. Recently, I switched of LG LED TV and haven’t faced any issues so far (fingers crossed).

    Nowadays, LG’s OLED Technology is doing rounds on the Internet and I see that as a great choice in 2021, but of course, brand selection is purely a personal choice.

  3. 3

    My 24 inches led tv stopped reading signals from the antena. I have checked my settings and cant find the problem. I am in Kenya

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  5. 5

    I was watching my Intex brand led 28inch led tv… But while watching it was showing horizontal lines and suddenly switched off.. And then switched on and happened this for atleast 2times…Couldn’t understand what’s happening..??
    Plz help

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    I have a 55” Hitachi model le55a6r9a. I can not see anything on the screen but it does pass the flashlight test so there are backlights. I started by replacing the t-con board and power supply board with no luck to either. Please help.

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  12. 12

    I have a Samsung flat screen TV and the picture has gone weird it flashes like it’s corrupted when trying to watch it there’s coloured squares and flashes best way I can describe what could be tge problem thanks

  13. 13

    I have a zenith old TV suddenly it stopped working, I replaced the Comcast box, new remore control, have [pwer but the screen is black
    no channels…it whowing the words Video 2 and the time….

    thank you…
    egi

  14. 14

    No power is showing on led while switch io the plug attached with led.

    Model…. Haeir
    Number….LE40B7500

    Pl advise

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    I have a 32inch premier smart led tv that comes on only in home screen always and not in full screen and I always have to use the remote to open it up into full screen every time and also when it comes on like this it’s useless without the remote you can’t control it from the tv itself

  18. 18

    i have a samsung led TV F5000. There is a issue in which picture is coming and going every second and audio is coming continuously. Kindly guide as to what may have happned?

    • 19

      Hi Ankit. Flickering displays are caused by loose connections inside the TV. Most probably a simple soldering job will do the trick here. The hard task is to spot that loose connection. Will suggest you take professional help. Book a case on our LED TV Picture Problem page and let us help you with that.

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