Distorted Picture Due to LVDS Fault in LED TV Symptoms and Fix

I came to a workshop for a Chinese LED TV repair. The picture on this TV was distorted. This fault could be due to LVDS. There could be many reasons for this. For example, a technician may have changed the panel. The second reason is that the LVDS select inverter is automatically set in the software. In this article, we will understand this fault in detail. From both the software and hardware perspectives, this is a common fault that occurs in all models. It has been seen.

Software reason

First of all, open the factory code of this TV and enter it in its panel section and change the setting of LVDS mapping there. Usually this fault is fixed from here. I have seen that customers themselves mess up this setting by opening the code, and then they don’t understand what to do. It is the technician’s fault that there are thousands of videos on YouTube. A non-technical person imagines himself as a technician after watching these videos. Well, if there is no hardware problem with the LED TV, then this step will fix the distorted picture.

Hardware solution

In hardware, we have to check the voltage on the LVDS select pin in the T-con for this fault. If the voltage is three point three, then connecting them to ground will fix the image. The opposite situation is this. If the voltage is low, then you will have to apply three points of three volts here. If there is no T-connector, then the same method will be applied to it as well. Whatever the panel, the formula is the same. LVDS high and low Note: You will have to use the three-point three-voltage panel itself. DC to DCIC first generates this VCC voltage.

• Here we will understand with an example what LVDS select is and how it works. Below is a picture showing a T-con, in which you can see the LVDS select test. The point is highlighted with a red circle. Here you will have to check the voltage. If the voltage is high here, you will have to lower it.
• High 3.3 voltage
• Low  0 voltage

LVDS mapping

The job of LVDS mapping is to determine how RGB will be applied to the panel. What I mean is that how these colors are applied is determined by the LVDS mapping in its place, and it is controlled from two places, both from hardware and from software. This is a fairly in-depth topic, but we will try to briefly explain how it works here.

 JEIDA Mapping

It actually delivers data to the panel in a specific order. If the panel works on the GDE format and does not receive the same data from the mainboard, the image will be distorted.

VESA Mapping

This is a branded method, usually used by Sony, Samsung, LG, or other large panel companies. The same thing is that if you don’t give data to the right bit to this panel, it won’t work.

Conclusion

In this article, we have tried to understand the mapping system, how it works, and where and how we can fix this part. One is that there may be a problem with the software; the other is in the hardware when we change the panel. Or we change the board in a Chinese television or in any other television, then this problem arises, and then we can solve it in two ways: through software and through hardware. If you know that this is in the hardware, the point of LVDS select in the T-con or scalar step should be known. To fix this, we have explained with examples where you will find it. In the pictures above, you can see that the Scalar strip and We have tried to explain in this article where the LVDS select points are located in the T-con.

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