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.

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?

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

Well, I guess I'll need to get me one on those if I am going to work on tvs. I assumed it was the power supply because of the voltage that I was seeing on -vled1 and -vled2 and the fact that we had power going on an off the night before it failed. Hurricane Irma came through here last Monday night and the tv worked for about 3 seconds when I turned it on Tuesday morning. The video quit but the audio was still working.

Is there any other way to test the led strips without purchasing a backlight tester? Could I bypass the...

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

Thanks budm, is there any way to test for discontinuity in the led strings?

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

From what I can tell from my test results and from reading other websites, it appears to be the power supply module so I ordered one from Securecore Solutions. They have a large inventory, great prices, a warranty, and a very good return policy. I will install it next week and update you with my results. Thanks budm for your help.

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

with the connector in place and the power off the voltage is anywhere from .01 volts to .9 volts for both -vled1 and -vled2 (they are usually the same). When powered on they go to 0 volts for about 2 seconds then back to where they were before it was powered on. The behavior is the same without the connector in place. The voltage on -vled1 and -vled2 seems to be all over the place. Sometimes I see it as high as 3.5 volts with the power off. What should the voltage be on those pins?

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

With the connector in place, the voltage jumped up to 97 volts before settling down to 65 for both +vled1 and +vled2. Without the connector in place, I got the same results.

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

Hello, I'm new to this forum and am trying to fix my tv that has no picture but has sound. It is a Sharp LC-50LB261U. I have done some basic troubleshooting by doing the flashlight test. With the flashlight test, I can see the images so it appears to be the power supply/inverter board or the CCFLs. I have 65 volts at the output of the power supply/inverter board on pins +vled1 and +vled2. Does that mean that my power supply/inverter board is good?

Re: New Members - please post your introductions here

Hello, I'm new to this forum and am trying to fix my tv that has no picture but has sound. It is a Sharp LC-50LB261U. I have done some basic troubleshooting by doing the flashlight test. With the flashlight test, I can see the images so it appears to be the power supply/inverter board or the CCFLs. I have 65 volts at the output of the power supply/inverter board on pins +vled1 and +vled2. Does that mean that my power supply/inverter board is good? I will repost this information on the thread that I was reading about someone else...