Hi. I currently have an LG 42LN5700 TV, and when I turn it on, it flashes quickly and then turns off. I opened the tv down to the led backlights, and found that there are five rows of led strips and the three middle ones don't work. So I would like to know exactly which part to change. Thanks.

The Knight

• 76851 Answers
• Posted on Jun 18, 2016

SOURCE: I have an lg50ln5100 led/LCD TV. I have be a backlight problem. When I turn my TV on there is about 4 strips that doesn't flash. I have changed all boards out. Could I have that many strip go at once?

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Mark Schmit

• 1915 Answers
• Posted on Oct 02, 2016

SOURCE: LG 32LN5300 LED TV that suddenly went to Black Screen no sound. Should I change out all three strips of LEDs?

This sounds more like a power supply problem than a problem with the backlighting, plus the lack of sound also would indicate something other than problems with the backlighting.

Testimonial: "I'm sorry, there is sound. I messed up the question when I tried to shorten it. No picture, black screen ... Sound does work ... but the LED lights just keep blinking on and off when the power is turned on."