vulkan

133

hace 5 años

Not only check the LEDs one by one, check the entire strips and their connections

Shafak

2

hace 5 años

Good morning again, dear friends:
Thank you all for your contributions. The problem has been solved as follows. Indeed there were some LEDs that although apparently they were fine, it was not so. as you pointed out. After replacing them, they lit all but intermittently, so I checked the source and replaced an electrolytic that gave way to the power of the baklight. When changing it, it went down from 170 to 140 v that the LEDs need.
Thanks again for your help.

Victor E

65.783

hace 5 años

I told him that in the beginning, but I don't want to return the TV.

Shafak

2

hace 5 años

Thanks Victor E, as I said the LEDs are all right, I will ride again and anyway, I will try the main disconnected as you point.

Victor E

65.783

hace 5 años

For me it has bad LEDs so the source is high. Sometimes with the tester they turn on but there is always one or two wrong, with the TV source they do not turn on.

vulkan

133

hace 5 años

I sometimes do the following test:
Externally feed a strip at a rate of 3.3v each LED, then I gradually lower the voltage, if there is a LED that goes out before the others, that is damaged

Shafak

2

hace 5 años

Good morning again, well, I followed your instructions step by step, all of them. The variation in the voltage drop of a led with respect to the others I think is negligible, so after measuring it I have not reached any conclusion. Now, as the voltage drops in one strip effectively, there is a LED in one of them and another in another that goes out before the rest, not happening this in the other two remaining strips, so I understand that those two LEDs are the cause of my headache. I will replace them and tell you results.
Thank you very much to all.

Victor E

65.783

hace 5 años

I told him from the beginning.

Shafak

2

hace 5 años

Thanks Pablito, as I said I followed your instructions and the difference in the voltage drop has not seemed significant from one LED to another, but also thank you very much for your contribution.

Shafak

2

hace 5 años

Thanks seekude, in fact, I have armed it as you have said but I have not managed to arm it, for lack of means for the four strips, I have only been able to try it 2 to 2. They have all lit up, I do not know if it will influence that they are not 4 connected. Anyway, as I said, when the voltage goes down, there are two LEDs that go out before the rest, I will start there.
Thanks again.