Sharp LC-50LB261U - has audio, no picture

[budm]

Re: Sharp LC-50LB261U - has audio, no picture

The -VLED is the return line for the LED string, you have Voltage feeding the +VLED but nothing is coming out on the return side.
You can try new power supply if you want but make sure it can be returned if it does not fix the backlights problem.
Taking 50" panel apart is the last thing you will want to try that why we should try to test the LED string by using external tester.
These look to what are being used in your panel but not 100% sure because they make more than one version of the panel.
http://www.usefulparts.com/tv-parts/...or-lc-50lb261u

[fredearl]

Re: Sharp LC-50LB261U - has audio, no picture

You were right budm, the power supply didn't fix the backlight issue. I guess I'll be sending this one back and taking this tv to the dump. Thanks alot for all of your help. I saw in one of the videos that you sent me that you could cut the bottom off of a low wattage cfl and use it to test the power supply output to the panel. Should I try that to see if it truly is an open circuit in the led string?

[attainteddragon]

Re: Sharp LC-50LB261U - has audio, no picture

please don't take it to land fill. put it ebay, buy swap sell etc, someone will be able to fix it or use it for parts. you already know that it is an led issue, so you can pass on the information.

[fredearl]

Re: Sharp LC-50LB261U - has audio, no picture

I won't take it to the landfill. I might buy a back-light tester and try to fix the led strips myself. It's cheaper than a new tv and I don't really have anything to lose. If I can't fix it I will sell it for repair or parts. Thanks again for everybody's help.

[notatvrepairman]

Re: Sharp LC-50LB261U - has audio, no picture

I had the same problem. I also replaced the power supply. It didn't fix the problem. Still have audio and still don't have video. I can see background video when I shine a flashlight on it. I don't have a back light tester, or even a voltage meter. I also replaced the function keyboard and the wires that attach to it. I did this because when I removed the screws on the back panel and went to pull it up, I broke one of the cables to the function key board. If you are working on this TV, be sure to remove the function key board (little strip that has the power button, volume buttons, channel buttons, and input button) before pulling the back panel off of the tv. The cable is pretty thin. I don't think I'm going to try to replace the LED strips unless people think it's pretty easy to do and it's pretty likely to solve the issue. I think I'm just going to get another TV, which is pretty disappointing, since this one is less than 3 years old.

[Push Eject]

Re: Sharp LC-50LB261U - has audio, no picture

Having the same problem as well. Here's a ridiculous video of me troubleshooting it just for fun https://www.youtube.com/watch?v=h8uZMmJzwXw

[mmartell]

Re: Sharp LC-50LB261U - has audio, no picture

Replacing the led strips is NOT easy to do but it WILL likely fix your problem. Follow budm's troubleshooting advice to be certain the leds are at fault.

[nv13]

Re: Sharp LC-50LB261U - has audio, no picture

Does anyone know what LED's they are individually to replace? 3528's? I have 4 of them out that I tested with the SID LED and backlight tester. Hoping to be able to simply replace those to get it working again.

[GRRR5000]

Re: Sharp LC-50LB261U - has audio, no picture

This is my TV and I have almost the same problem. My problem is it turns on and I have a picture for about 15 minutes then the screen just goes black. TV stays on but I cannot tell if it responds to remote or buttons except for turning power off. Sometimes I do have to unplug it. If I leave it unplugged for two or three weeks it will turn back on and I have to start setting it back up through the menu. Just about the time I get it setup it goes out again. I have it opened up and I took the power board out looking for some type of visual problem like the bulging capacitors I read about but I don't see anything like that. What are your thoughts please for a newbie?