How to Fix Normal Sound Dark Picture LED TV

How to Fix Normal Sound Dark Picture LED TV - To fix a dark picture LED TV, of course we have to know what dark means, it could be that the backlight or backlight really doesn't turn on or turns on but only displays a dominant black color so that the image is not visible but the sound is normal.

Cases of this kind of damage, namely LED TVs with no picture, usually attack the LED TVs of the Toshiba, Samsung, LG and Sharp brands, which actually causes this damage is not much different and in general the backlight lights are dead and must be replaced.

But it is not only damaged in the backlight lamp, there are other causes that you should know, in this article you will quickly find out how to fix LED TV images with normal sound, along with the causes so that your knowledge of electronics, especially television circuits, becomes more mature.

 How to Fix Normal Sound Dark Picture LED TV

Previously you had to know why this kind of damage could occur, for only 3 causes, the possibility could be more, but this is what often happens, including:

•  Backlight Lamp Off
•  IC damage in the Tcon module
•   Software Damage.
  

To fix a dark picture LED TV, of course we have to know what dark means, it could be that the backlight or backlight really doesn't turn on or turns on but only displays a dominant black color so that the image is not visible but the sound is normal.

Cases of this kind of damage, namely LED TVs with no picture, usually attack the LED TVs of the Toshiba, Samsung, LG and Sharp brands, which actually causes this damage is not much different and in general the backlight lights are dead and must be replaced.

But it is not only damaged in the backlight lamp, there are other causes that you should know, in this article you will quickly find out how to fix LED TV images with normal sound, along with the causes so that your knowledge of electronics, especially television circuits, becomes more mature.

Backlight Lamp Off

Why does the backlight lamp turn off? Is it all short? You have to know, behind your led tv screen there are several LED lights that function to provide light to the panel so that the image is visible, if one of the led lights is broken then all of them will not turn on, so you don't have to replace a set of backlights.

To check it first you have to check the DC voltage to supply to the LED panel, on a samsung brand tv, usually the supply voltage for the LED panel will be generated by a circuit called the Boost Converter which can produce a DC voltage of approximately 135V, the main function of this circuit is to raise the DC voltage to a higher one.

The 135V voltage aims to supply approximately 45 LED backlight lamps arranged in series, so this is the reason why if one lamp breaks, everything will die, it is because it is assembled in series.

To measure the 135V voltage, you can use a manual or digital AVO meter through the two feet of the voltage eco filter electrode, namely C9801 (22uF / 250V) to measure it first, you have to set the AVO meter to the DCV250 number.

Damage to a series of LED lights can be indicated if the voltage you measured earlier shows a figure of around 230V, because such a large number can be measured because of the voltage released by a circuit called Buck-Converter without being burdened.

If it is confirmed that the LED light is the problem, then you must immediately dismantle the TV, the location of the LED light is of course behind the panel, so when you dismantle you have to be very careful not to damage the panel, if it is damaged it cannot be repaired unless replaced with a new one. and the price is not cheap.