Sharp LC-70LE757U Obsure screen defect.

[Shinju]

Hey all!

I probably already know the answer to my question but here it goes anyway.

I got this for the price of a big mac meal, came with the remote and 2 pairs of 3D glasses, the panel comes on and work but the picture looks like a bad V-sync like an old CRT screen, the picture doesn't roll but the black lines/defects do, also the picture is dim and flickers the LEDS are fine when the screen is on black no flicker at all, only when a signal or menu is up or open.

I got into the SM and found the test patterns there was 5 options only 3 were available and none had any information on what was being tested so I assume it was Main board, FRC and T-con. All of them failed.

I have yet to take it a part, its bigger then my work bench so I need to find a safe place to lay it down or prop it up.

Such a bummer if its a bad screen, this was the top of the line Sharp and not very old as the unit only had 3400 hours on it.


Thanks all!

[Shinju]

Re: Sharp LC-70LE757U Obsure screen defect.

So, I took the back off and fooled around with the t-con TFT ribbon cabled and I unplugged the right side and slowly set the clip on the t-con down to pinch the ribbon in the screen for a second or 2 goes back to normal and then after that the gamma/picture go back to that you see above.

I almost wonder if the t-con is failing and the screen is fine, the SHARP logo when turning the unit on looks as it should then the strange gamma flicker starts.

Debating on taking a gamble, would be a nice LED TV to save lol it's massive!

I don't see any ghosting when the tv is displaying a moving picture, this panel is strange there is a TFT board on the left and right side of the panel too.

[Shinju]

Re: Sharp LC-70LE757U Obsure screen defect.

Sad ending, I was checking the bottom side tft boards and one of the speakers slipped off its pegs and landed on top of the LED/power supply and it put the TV into SOS mode, after I removed the speaker I plugged it back in and now no LED illuminate. The panel is on I can see the image with a flashlight.


Oh well gonna button in back up and recycle it.

[Shinju]

Re: Sharp LC-70LE757U Obsure screen defect.

One last update, I tuned the panel back on and after a few min of bring on the LEDS turned on no picture, turned it off and back on LEDS and picture then after a few min the LEDS shut down again.

[tom66]

Re: Sharp LC-70LE757U Obsure screen defect.

Don't feel too bad, it's a bad panel anyway. These big Sharp sets are failing in large numbers. LE7xx and LE8xx to be avoided.