LG 39LN5700 backlight failure, LEDs caught fire?

[pgram]

The TV is a 39" LG 39LN5700 "Smart" LED LCD TV that is about 2-3 years old. The picture went out, but the display still seemed to be working as the picture was visible when using a strong flashlight. I have some basic knowledge of electronics and wanted to see if it was fixable and looked up a bunch of troubleshooting info. Unfortunately I fried the power supply board by accident while testing voltages

Anyway, before it burned out I was getting around 22.7v at the 24volt output to the main board, which looked close to spec, but the "93.2~118.5V output" (I'm guessing to the LED backlights) was way off. The TV had it the Input listed as "100-240~ 50/60Hz 2.0A" and Output listed as "133.2V - 0.37A 39 Inch", but with the TV on I was measuring a cycling voltage at the LED+ lead that went from 232V down to 214V, no change whether the LED cable was connected or disconnected.

After frying the power supply board, I gave up and decided to strip it for parts and see what was worth salvaging. When I started taking apart the panel housing I was greeted by a nasty smell, and then saw what I'm guessing was the source of the backlight failure (picture attached). My question is if this is common/normal? I don't expect LEDs to last forever, but to fail so spectacularly?

I've tried contacting LG about it, but only got one reply from them asking for contact info (which I put in an email reply) and have yet to hear back from them. I was worried it could be a potential safety issue with other LGs with the same parts. The TV is well outside of warranty and I don't think the display wasn't made by LG (I think they outsourced it to Heesung Electronics).

[ReeceyBurger123]

Re: LG 39LN5700 backlight failure, LEDs caught fire?

Well it is fixable, common issue in Leds the lamps fail causing no backlight. Yours have failed shorted and got VERY hot. You can fix it easily, im willing to help if you want ?

[pgram]

Re: LG 39LN5700 backlight failure, LEDs caught fire?

Thanks for the offer, but I already gutted the TV thinking it was a lost cause. After shorting the wires on the power board, the TV would no longer power on. So with the LED strip gone (at the time I was thought I would have had to replace all the LEDs) and possibly both the power board and main board gone (I shorted the wires on the cable connecting the two PCBs), I was estimating a repair cost well over $100.

I guess it might still be fixable, but it would be fairly involved at this point. I would have to reinstall/replace the LED strips I removed and fix/replace the power board and/or the main board.

Is it common for the LED strips to get so hot they burn/melt strip they're connected to when they fail?