52"RCA Problem.

[wadenvk]

Re: 52"RCA Problem.

Here are some pictures could not get the whole strip in there.

[johnboy1313]

Re: 52"RCA Problem.

Wow. I have no idea. At this point, I'm honestly guessing. On the left of the picture of the LED side of the strip, there are two test points labeled + and -. In between all of the other LEDs is a test point. I'm thinking that they are all +. There are also five pins at the connector and ten LEDs on each strip. I would guess that each pin is connected to a pair of LEDs. They are likely all connected to a common ground. I would start by checking for continuity between the five pins when the strip is unplugged and when it is plugged in. I would also check for continuity between each of the pins and each of the test points. Finally I would set my meter to diode mode and put the red lead on a test point and the black lead on the - test point, then swap the leads and check them all again.

[johnboy1313]

Re: 52"RCA Problem.

Also, in this pic

https://www.badcaps.net/forum/attach...8&d=1386285536

It looks like there is writing between the 2nd and 3rd LEDs and the 5th and 6th LEDs (starting from the center of the panel). Could you post pictures of the writing?

[johnboy1313]

Re: 52"RCA Problem.

Another thought that I just had is that you may be able to unplug the two bad strips altogether and get the set to power on. If that works maybe you could swap the good ones around so that the top strip on one side and the bottom strip on the other are missing. It would obviously be a little dimmer at those points but maybe not enough to be a deal breaker.

[wadenvk]

Re: 52"RCA Problem.

Alright I have tested the two strips that are not lighting up and found nothing wrong with them, I switched them out with known good strips and they do flash so I may have to head back to the supply.

[johnboy1313]

Re: 52"RCA Problem.

You put a strip that would flash in the spot of one that wouldn't flash and it then didn't flash? I suspect that the PSU is good. You may want to check the wiring.

[wadenvk]

Re: 52"RCA Problem.

Alright I have tested this down to one strip that has different voltages. I was able to order all new strips but wondering if there is a way to find out what the voltage should be coming in to the strips from the board. right now I have 178v at the plug and at the start of the strip and gets lower as I light each led. The 178v take's care of two strips.

[johnboy1313]

Re: 52"RCA Problem.

178v for twenty LEDs seems high. I've been wrong before though. Unplug con5 and con6, power the set on, and take readings from the + pins on those connectors.

[wadenvk]

Re: 52"RCA Problem.

Sorry was on wrong setting the dc voltage is 81.6 at the pin on con5 and 6 + and it is 81.6 at each led strip.

[wadenvk]

Re: 52"RCA Problem.

Should that voltage jump around when powering up? With my test leads in place and powering it up voltage jumps to 160vdc then drops to 81.6.

[johnboy1313]

Re: 52"RCA Problem.

I wouldn't expect that much of a spike. It's possible that your meter is just thinking a bit before it gives an accurate reading.

[wadenvk]

Re: 52"RCA Problem.

Thanks waiting on the new led strips. the one strip that i have narrowed it down to when just that one is plugged in there is no flash but constant power there 81.6vdc and i can test each led they all work in series but when i get to 19 and 20 led there is not enough power left to light them up. weird.

[johnboy1313]

Re: 52"RCA Problem.

Thanks waiting on the new led strips. the one strip that i have narrowed it down to when just that one is plugged in there is no flash but constant power there 81.6vdc and i can test each led they all work in series but when i get to 19 and 20 led there is not enough power left to light them up. weird.

I don't follow your last comment. There are 10 LEDs on each strip, correct? Which LEDs are you calling 19 and 20? I'm thinking you may be able to substitute a resistor of some value in place of the two bad LEDs but I'm so far removed from an electronics course that I don't remember everything I've learned about LEDs. I keep bringing this thread back to the top hoping someone with more knowledge will step in and help you out.

[wadenvk]

Re: 52"RCA Problem.

They are hooked up in series so two strips will power up at once, With the two strips are powered up there is no flash and I can read power on all 20 leds when I check down the line of leds when I get to the last two there is not enough power to light the last two up.
The new leds should be here today will put them in and see what happens. I will figure it out one way or another. Thank again for pointing me in the right direction.

[wadenvk]

Re: 52"RCA Problem.

Thank you johnboy1313 the tv is working great 26 bucks for the new leds and that was all it needed. thanks for leading me there.

[johnboy1313]

Re: 52"RCA Problem.

AWESOME!!!!!!! 26 well spent bucks.

[django7975]

Re: 52"RCA Problem.

Hello, If anyone is still watching this thread i have a similar problem with the identical model. I have followed the instructions in the thread and managed to confirm all of my led's will burn. I can unplug com5 and com 6 and get the big cap to read 380V. When i jump the led from negative to positive all the lights come on on the positive led's but i have to use the positive led lead to get the negative led strips to come on. I really don't know how to proceed from here. Thank you.

[jeremy1976]

Re: 52"RCA Problem.

Where did you buy the LED strips? and how are they replaced? all on one board or in strips? Thanks have same issue

[madlee357]

Re: 52"RCA Problem.

Check the main capicatior