LG LED TV Repaired With No Picture Symptom
This LG LED TV came in for repair with the complaint of no picture but there was power and sound. From my experiences, it could be possible the backlight problem because if one of the single LED backlight have problem the whole display would shutdown or totally no display at all.
The first thing to check the backlight is to use a LED TV backlight tester. From the test, it seems that the fault was in the LED backlight.
The next step was to remove the panel and exposed the LED backlight. From the picture below, you could clearly see that the many of the LED Lends already dropped out.
By checking all the LEDs individually, I found many of the LED backlights were either open or short circuit.
Since there were so many LED backlight have problem, the only way to repair it is by replacing all the LED strips.
After the replacement and powered On, you could clearly see all the LEDs were lighted up, there was no more shutdown and you could see the picture again in the photos below:
Conclusion- To dismantle the LED TV panel to expose the LED backlights was really time consuming and a delicate job. If you are in rush then don’t open it. You may need to take your camera to capture the photos of the panel parts so that you will know how to fix it back after installing the good LED backlights.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous post in the below links:
https://jestineyong.com/no-picture-and-sound-in-led-tv-repaired/
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Sarhan
August 14, 2019 at 9:49 am
Good article
albert van bemmelen
August 14, 2019 at 1:57 pm
Pro repair that indeed involves a lot of time to fix the backlight panel by new Led strips. Recently I tried to fix the backlight of a second hand 25 inch HP by removing the CCFL lamps and replacing them by Led strips. Sadly the China Led backlight Buck driver board with on it a DF6113 chip, a 15N10 mosfet and a SS210 all went up in smoke. The board with DF6113 was used without OVP and decent Over-current protection like the specs in its datasheet required and without the right component values, which probably explained why it got up in smoke and it got very hot the moment it was used. Luckily the backlight leds are still fine. And I will try to fix the driver board that according to its manufacturer/designer should have worked from 10V upto 30V DC. But that was hard to believe because the DF6113 chip is only to be used upto 24V!
Henrique J. G. Ulbrich
August 15, 2019 at 6:22 am
Very good, Suranga. It seems that you went straight and quick to the point. Thanks for sharing.
Humphrey Kimathi
August 17, 2019 at 1:18 pm
Awesome!
Parasuraman
August 17, 2019 at 4:41 pm
You are a cool and sureshot master technician! Well done! Thanks for sharing!