Proscan PLDED3992A-C led failure?

[jose6326]

I read a couple of threads on this set but i didnt see any repair resolution
But it did guide me to take apart the panel to get to the led strips

As you can see the bottom 2 strips do power on and the top does not. But they flash non stop every second

I disconnected the top strip to see if the bottom 2 would stay on but they continued to flash every second

Would this mean the top strip is faulty ?

I couldnt find any replacement strips on ebay or shop jimmy but i did find leds on ebay but dont know if they will work

http://www.ebay.com/itm/201884466717?redirect=mobile

[dskall]

Re: Proscan PLDED3992A-C led failure?

Don't think they will work. 30mv. You will need at least 1watt 350mv. I would also recommend led backlight tester like one of these http://www.ebay.com/sch/i.html?_from...Tool+&_sacat=0

[jose6326]

Re: Proscan PLDED3992A-C led failure?

So if one led is faulty the entire strip goes out?

Will the tester tell me the mv & wattage of the led?

[jose6326]

Re: Proscan PLDED3992A-C led failure?

Would these work?

http://www.ebay.com/itm/10-50-100pcs...W9EutzNMZ8Oriw

[dskall]

Re: Proscan PLDED3992A-C led failure?

They are in series if 1 opens the strip will go out. If 1 shorts the shorted 1 will go out. The tester will tell the working voltage at 300ma

[dskall]

Re: Proscan PLDED3992A-C led failure?

Those will probably work. Look at this before you order http://alpengeist-tvrepair.blogspot....ces-tools.html

[Andrew F. Ali]

Re: Proscan PLDED3992A-C led failure?

Unless you have the means/skill to remove and replace individual LUDs on a backlight strip. I would recommend looking for a close enough substitute and replacing the entire strip. In my view, if the substitute strip has the same spacing and No. of LEDs, working voltage for each LED at 2.5Vdc, you will have success. I have substituted strips before and have had no callbacks....Go brave.

[jose6326]

Re: Proscan PLDED3992A-C led failure?

Unless you have the means/skill to remove and replace individual LUDs on a backlight strip. I would recommend looking for a close enough substitute and replacing the entire strip. In my view, if the substitute strip has the same spacing and No. of LEDs, working voltage for each LED at 2.5Vdc, you will have success. I have substituted strips before and have had no callbacks....Go brave.

I would rather replace the entire strip but i cannot find any substitutes with the same amount of LEDs.

[jose6326]

Re: Proscan PLDED3992A-C led failure?

I found one with 13 LEDs do you think i can cut iff the extra 3 and it will work?

[paulstef]

Re: Proscan PLDED3992A-C led failure?

I found one with 13 LEDs do you think i can cut iff the extra 3 and it will work?

You can relatively easy improvise with these kind of LEDs. You can either replace individual LEDs with the help of a hotplate and solder paste. You can probably also cut a piece of a longer strip. Pay attention to the polarity. The distance between the LEDs may not be the same though so the reflective sheet may not fit.

Have a look here to see how individual LEDs are replaced: https://www.youtube.com/watch?v=M_E7...8&spfreload=10

[jose6326]

Re: Proscan PLDED3992A-C led failure?

I found the following LEDs that look similar to what i have

http://www.ebay.com/itm/10pcs-Backli...-/322465316966

this one looks like the same length and has the same amount of LED's

http://www.ebay.com/itm/WESTINGHOUSE...sAAOSw-3FZBTUf

[jose6326]

Re: Proscan PLDED3992A-C led failure?

i have a heat gun will that work to remove the LED?

[dskall]

Re: Proscan PLDED3992A-C led failure?

I replace leds with hot air station.

[Andrew F. Ali]

Re: Proscan PLDED3992A-C led failure?

I found one with 13 LEDs do you think i can cut iff the extra 3 and it will work?

If the spacing is the same as the 10 LED strip I will tell you yes, but would have to make a loop connection to continue the series chain for it to work. I have done this twice. The spacing was different and I cut new holes in the white reflective sheet lining for the new LEDs. It worked. When I closed every thing back up you couldn't tell the difference.

[paulstef]

Re: Proscan PLDED3992A-C led failure?

i have a heat gun will that work to remove the LED?

I did not have good experiences with hot air. If you heat the LED too long the casing may break/melt. For removing that's ok.

Soldering the new one with hot air will take quite some experimenting I guess. If the LED strip is an aluminum PCB you can heat easily from below...

I now only use hotplate/oven etc and solder paste etc.

[dskall]

Re: Proscan PLDED3992A-C led failure?

I tried several methods. So far the best for me is hot air. When reinstalling I heat up pads till molten then drop led on an heat for several seconds. What works for one may not work for others. You have to find your own method. I also do not remove strip from panel which saves time. Of course you have to make sure nothing on other side of panel tp melt.

[jose6326]

Re: Proscan PLDED3992A-C led failure?

I have one of these that i will try to remove the leds

[jose6326]

Re: Proscan PLDED3992A-C led failure?

I ordered the led tester as well

[dskall]

Re: Proscan PLDED3992A-C led failure?

I have one of these that i will try to remove the leds

I have same one. Led tester is nice with all the failed led's now

[jose6326]

Re: Proscan PLDED3992A-C led failure?

so i got the LED tester and tested all 3 strips

the bottom 2 strips light up

the top strip does not