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Shorted LED Lights In An LED TV Repaired. Model LG
A friend of mine brought this LED TV for repair. It is an LG TV and to be honest with you, I really hate LG product.
They work fine but when they break down, the parts are too expensive.
When I powered the TV set, there was a red LED light coming on but there was no picture. I took the screws off and here is what I found.
As seen, power supply, main board and the T-con board, hidden under the TV stand.
This is the model number of the device. From my experience and I have seen so many of this kind of problems. It is the LED lights inside. When there is even one LED light shorted it effects the whole lights in there causing to have a black screen.
To make sure that the LED lights are bad, you need to go to the power board and check the 24 volts out. If these 24 volts are there, usually, the LED lights inside the panel are shorted and it has to be checked and replaced.
This is what inside a LED TV panel looks like. All these LED light has to be checked for short. The best way to do that is to set your meter on diode mode and touch the positive and negative on the LED strip and the Light should come on.
If the LED light did not light one, it is shorted and need to be replaced. It is an easy way to do it but it is a long process because you have to check all of these LED lights.
I took the white reflector to expose the LED Lights to be checked. Many technicians replace the shorted LED light strip and that cost a lot of money. My customer wanted the cheap fix because he wanted to give this TV set to his kids to be used with play station. So with that in mind, I came with a different way to fix this. I found about four lights shorted. Once I soldered all of them off the board, I added a tiny wire across the terminal of the LED light. In other words, cancelled the light but made it a connection to the next light in line. Once I did that, all the remaining lights came on.
The idea here is to make the whole panel come on without a black spot to be found on it. In other words, if I have two bad LED light in a row, I will have a problem lighting that spot because two shorted lights, will give you a black spot and that is what we are trying to avoid. In this case you will have to add LED light or replace the whole light strip.
Here is a bad LED light. The scratch mark indicates the volt meter spots to test the lights. I took the plastic diffuser off to replace the light.
Here is the result. Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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