Hisense 50k23dg backlight problem

[mourningstar625]

TV symptom was no backlight, everything else worked great. Seemingly the backlights are a common failure on these I decided to open it up and give it a shot on replacing the LED strips. I open it up and look at the horror of what I found underneath (See attached pics).

I wanted to test if any of the other strips were defective, what is the best way to do this ?

After some soldering I replaced the burnt part of the white wire and added some length to the red wire so I could bridge them together, is this the proper way to test the other strips? I tried it but I got nothing but an 8 blink code on the IR sensor. I'm just trying to think of a good way to test the strips so I can see if any others are bad. Quick edit I get a solid 24v from the power supply on the output for the LEDs

Thanks for any help!

[mourningstar625]

Re: Hisense 50k23dg backlight problem

My quick edit was mistaken I get 230v - 240v with the LED cable connected or not. I just bridged the red wire together and I still get the same blink code of 8 blinks.

I searched the forum and there seems to be one other similar thread with some measurements but there is no follow up to what the measurements should be etc.

[dick_barton]

Re: Hisense 50k23dg backlight problem

If you have bridged out one strip of leds then it will not work. All the leds on all the strips must be working in order for the backlights to come on. You can check each strip of leds or individual leds.There are plenty of Youtube video's available.

[mourningstar625]

Re: Hisense 50k23dg backlight problem

Is there a way to test one strip at a time? I'm waiting on new LED strips should be here in like 4-5 days. Trying to do as much troubleshooting as I can before they get here.

[freakaftr8]

Re: Hisense 50k23dg backlight problem

Problem? What's the problem?? Lol. Well this is what happens when LED strips are driven to the brink. When they get there make sure you turn the backlight level down and also make sure you get a new wiring harness with those strips.

Most likely one shorted or open circuit the other ones went too bright in a shorted as well. That's pretty bad so that they got that hot they caught fire

[mourningstar625]

Re: Hisense 50k23dg backlight problem

Any leads on getting a new harness I can't find one anywhere. I managed to find the strips and most everything else on the TV but not that wiring harness. I really need one of those little connectors as the old one melted and im not quite sure how I'm gonna solder bare wire onto those small wires.

[freakaftr8]

Re: Hisense 50k23dg backlight problem

I might have a harness here you hould hack and spice into your existing harness. Show a close up pic of the LED connector.
Are you in the US?

[mourningstar625]

Re: Hisense 50k23dg backlight problem

ya im the US, here are some pictures. The first is the side that goes into the power supply and the second set are the ones that plug into the LEDs

[freakaftr8]

Re: Hisense 50k23dg backlight problem

KI should be home in about an hour 1/2. I'll check my stash.
Had to go do mall shopping w the wife.... yuk

[freakaftr8]

Re: Hisense 50k23dg backlight problem

Well I checked all my harnesses and they are all two pin, even though yours only use 2 wires you have a spot for a 3rd center pin so mine are narrower so they probably won't fit. Sorry I tried. Hopefully the ones you get may have a wire harness on them.

[mourningstar625]

Re: Hisense 50k23dg backlight problem

no the ones I got are just the strips, no connectors, i'm going to hack together something

[jackfish]

Re: Hisense 50k23dg backlight problem

had the exact same problem....replaced 3 bad strips...one almost started a fire..you can put 21v to the strip to check if they work..theres a + and a - sign on the strip you can probe...the problem i had after was the plastic screen that the led sits on was black in the corner from smoke...couldint get it all off..

[mourningstar625]

Re: Hisense 50k23dg backlight problem

Well boys I got the lights in today and they work find but I somehow cracked the LCD when putting it back on RIP me. On the somewhat bright side only one other strip was bad and 2 other strips only had 1 LED out a piece, so 7 good working ones.