You can hear the programme perfectly, but the screen stays black. It is a fairly common LED TV fault. The good news is that this symptom gives a fairly clear clue: the TV is still on and processing the signal, it is only the picture side that has a problem.

Before you panic or rush out to buy a new TV, there are a few safe checks you can do at home.

Simple checks to try first

Work through these in order:

  1. Make sure the correct input is selected. TVs sometimes switch to an empty HDMI or AV input. Press Source or Input on the remote and choose the right one.
  2. Check connected devices. If you use a set-top box, receiver or games console, switch it off and on again. Try a different HDMI cable too.
  3. Do the torch test. In a dim room, switch the TV on and shine your phone torch at the screen from close range. If you can make out a faint image, the backlight is the likely culprit rather than the panel itself.
  4. Open the TV menu. Press Menu. If the menu does not appear either, the problem is inside the TV, not in an external device.
  5. Unplug it for a few minutes. Turn the TV off, unplug it from the wall, wait around five minutes and switch it back on. This sometimes helps if the system has simply frozen.

The most common causes

When there is sound but no picture, the cause is usually one of these:

  • Failed LED backlight. LED TVs use strips of LEDs behind the panel. If one or more fail, the whole screen can go dark. A positive torch test usually points here.
  • A fault in the backlight driver circuit or part of the power supply, so the LEDs are not getting current.
  • A loose panel cable or connector, for example after the TV has been moved or knocked.
  • A problem on the main board that processes the picture.
  • Damage to the display panel itself, usually after an impact or pressure on the screen.

Each cause needs a different repair, so a hands-on inspection by a technician is the only way to confirm which one you are dealing with.

Parts you should never touch

It is very important not to open the TV yourself, however many tutorial videos you find online:

  • The power supply board stores electrical charge in its capacitors, even after the plug has been pulled. Touching it can give you a dangerous electric shock.
  • The display panel is extremely thin and fragile. When the case is opened, the panel can crack or scratch easily, and replacing a panel generally costs far more than repairing a backlight.
  • The ribbon cables connecting the panel tear easily if pulled without the right technique.

Stick to the external checks described above. If they do not solve it, hand it over to a technician.

Tips to help your TV last longer

  • Use a stabiliser or a surge-protected power strip if your home’s supply fluctuates.
  • Avoid running the TV at maximum brightness all the time, as it makes the backlight work harder.
  • Leave space for ventilation behind the TV, especially if it sits inside a closed cabinet.
  • When moving the TV, keep it upright and hold it by the frame rather than pressing on the screen.

If your LED TV has sound but no picture, you are welcome to bring it to Mars Electronics in Cilodong, Depok. We inspect and diagnose it first, explain the estimated cost before any work begins, and every completed repair is covered by a one-month service warranty.