Comments on: Shorted LED Lights In An LED TV Repaired. Model LG

By: Shingirai Magaso

Shingirai Magaso — Tue, 12 Dec 2017 11:41:11 +0000

In reply to IVAN1.

The supply is designed to provide constant current, if you increase the number of lights, the overall voltage across all the LEDs will increase. If you decrease the number of LEDs, the overall voltage across all the LEDs will decrease which means that the voltage across each LED is not altered by adding or removing some of the LEDs because the supply is driving constant current through the LEDs.

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By: Shingirai Magaso

Shingirai Magaso — Tue, 12 Dec 2017 11:32:59 +0000

In reply to kirui.

You are correct

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By: Zibbo

Zibbo — Thu, 16 Nov 2017 19:28:40 +0000

In reply to Menahem Yachad, Jerusalem, Israel.

This is very true, I learnt that the hard way when the TV I had fixed by removing 2 burnt LED's came back after a month with the same problem!

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By: Waleed Rishmawi

Waleed Rishmawi — Sat, 04 Nov 2017 07:42:17 +0000

albert: by making sure that every other LED light is on other wise you will have dark spots on the screen display. if i have a strip of light that has two bad LED light in a row, I will have to replaced the whole strip or just replace the actual LED light on that bad spot. I hope this answer your question. thanks for sharing

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By: Waleed Rishmawi

Waleed Rishmawi — Fri, 03 Nov 2017 10:16:56 +0000

In reply to Menahem Yachad, Jerusalem, Israel.

Menahem: thanks for your input. I usually replace all the strips in the LED TV but this one, the customer did not want to spend a lot of money on it so that is why I did that. I usually explain that to the customer. I besides, I have done that before many times and so far i did not have any complain from the customers.

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By: Waleed Rishmawi

Waleed Rishmawi — Fri, 03 Nov 2017 10:10:59 +0000

In reply to Mike B.

Mike B: if one is open, the rest of the strip will be open as well. so I bridge them out so the strips will get power and come on

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By: Albert van Bemmelen

Albert van Bemmelen — Fri, 03 Nov 2017 08:38:50 +0000

Interesting repair, but I agree that replacing the open white leds instead of just shorting them must be the only and correct way to repair such backlight failures. I still do not understand how you say you solved the now open spots that still contain the now dark defect leds?

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By: Robert Calk

Robert Calk — Thu, 02 Nov 2017 21:31:05 +0000

In reply to Walt.

I keep my TV at about 65%, and my laptop at 50%.

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By: Yogesh Panchal

Yogesh Panchal — Thu, 02 Nov 2017 16:16:52 +0000

waleed
thanks for sharing your experience.

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By: Walt

Walt — Thu, 02 Nov 2017 14:50:06 +0000

Howdy, Mr. Waleed. Thank you for your response. I also run into cost and mostly availability issues with the strips. I have serviced many of these units over the past several years. As I have been servicing equipment for 40 years soldering comes second nature to me. I have never replaced a strip just the individual LED's that are defective. It is tricky, but after doing so many it has become easy to do. As for the response about the PSU, I have only had one with an issue and it was just the opposite of over driving. The current against the specs on the LED's is typically in line with the LED specs on the units I have serviced. If you are familiar with butane hot air solder units, I'm sure you are. I remove the LED's with that and then just float the new LED's with a fine tip soldering iron set to 800. Just a few quick touches and it is done, of course three dabs of high temp glue to put the lens back in place. I have many out there from close to two years now still working, so I guess I must be doing fine with my repairs. Only one call back in all that time. Thank you and God Bless as well. Walt

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