LED Strip repair for RCA 50B45RQ

[Teflonbandit]

I have a RCA 50B45RQ with a bad LED on one of the strips kicking me out on over current protection. They used several different strips in this model depending on when it was built. Mine uses ic-a-kjab50d354 which at this time not easy to find from a harvester. I was wanting to know if anyone has successfully changed the SMD on one of these strips?

[CapLeaker]

Re: LED Strip repair for RCA 50B45RQ

youtube: norcal715
there is a video from him doing just that.

[Teflonbandit]

Re: LED Strip repair for RCA 50B45RQ

Capleaker. Which video is it. I didn't see it when I searched Youtube. Thanks, John

[ReeceyBurger123]

Re: LED Strip repair for RCA 50B45RQ

Look for his Lg 47" Led repair.

[ReeceyBurger123]

Re: LED Strip repair for RCA 50B45RQ

https://m.youtube.com/watch?v=Bf5T2wwtydY

[chrismurphy]

Re: LED Strip repair for RCA 50B45RQ

The fault is probably not a over current but a faulty LED string
find the faulty LED and just short it out (if they are all in series)
done this plenty of times , be careful of the LCD screen they are extremely fragile

[ReeceyBurger123]

Re: LED Strip repair for RCA 50B45RQ

No dont short it out very bad idea ! Doing that means the others have to drop more voltage across them due to one being skipped over, meaning the others get hotter and more likely another one will fail shortly after due to this.

Leds in Tv's are in series, and when one fails it normally fails O/C meaning the chain is broken so non of them will light. Shorting it out is not a good idea trust me.

[chrismurphy]

Re: LED Strip repair for RCA 50B45RQ

yes you are right ,but there are many more LEDs in series in these sets and the difference for each one of them will be very small . The best idea is to add 5x 4004 diodes in series (approx 3.5 volts) and place them across the faulty LED ,then there will be no increase on the other LED's
I have done this on 2 sets and works well ,with no noticeable image issues

[ReeceyBurger123]

Re: LED Strip repair for RCA 50B45RQ

Fair enough, yes best way is to either replace the Led with a 1w Smd type or sub it with a resistors or diode. Then to save the others turn down the backlight brightness

[Teflonbandit]

Re: LED Strip repair for RCA 50B45RQ

I was able to track down the bad LED when I posted. The strip I had was an odd part number that wasn't easy to find but one of our fellow members hooked me up. Up and running. He also gave me a bad strip so I could practice SMD replacement.

[ReeceyBurger123]

Re: LED Strip repair for RCA 50B45RQ

Awesome let us know how it goes when all back together

[Teflonbandit]

Re: LED Strip repair for RCA 50B45RQ

It's up and running nicely.

[Teflonbandit]

Re: LED Strip repair for RCA 50B45RQ

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