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Old 06-29-2016, 08:05 PM   #1
snake91876
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Default Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Don't know the history on this set. Powers on backlight then dims down, if u press up or down backlight lights up brighter. No on screen menu. Tried plugging up with volume down and input pressed and I get a messed up screen. What u think, I tried reseating the tcon ribbon cables but it didn't help anything. Turned on several times resetting and get a lol different image every time.
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File Type: jpg 0629161853.jpg (981.6 KB, 36 views)
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File Type: jpg 0629161853b.jpg (931.6 KB, 17 views)
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Old 06-30-2016, 02:39 AM   #2
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

I would guess tcon since the main is responding to remote commands etc.
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Old 06-30-2016, 04:47 AM   #3
snake91876
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

It doesn't change channel , volume or show on screen
Menu. Not really responding to anything but vol - and input gets it to that screen I showed before.
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Old 06-30-2016, 06:24 AM   #4
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

actually, its more than likely a panel issue which has been "saved" in a number of thread. One test that will likely get you further (ie. a picture) is to unplug the small corner interconnecting cable running from the little lower boards of the panel to the little side boards. Try one side first and then the other. Go from there.

PS. looking at your pictures, you can see the horizontal line across the top... it looks like it originates from "screen right".... thus, you likely have a bad panel tab on the right side.

Last edited by budwich; 06-30-2016 at 06:26 AM..
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Old 06-30-2016, 02:40 PM   #5
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Well I got a picture, I took the bottom right cable connecting side board to bottom board.I got a picture, sound , on screen menus. Color is distorted and still a horizontal line up near top 4" down about 3/4" wide. OK so how can I fix it all the way.
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File Type: jpg IMAG1148.jpg (237.6 KB, 14 views)
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Old 06-30-2016, 03:40 PM   #6
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Good... well good that you got a picture... bad because that is likely a panel problem. The set can be "saved" to basically give you back a clear working picture. The tab drivers CAN NOT be fixed, they can only be removed, hence the "save" as the set is no longer working on "factory spec / design".

You need to remove all the tabs along the right side of the panel... these are brown /orange flex tab cables bonded to the side of the panel connecting the little side boards (probably two). You basically "gently" pull the tab away from the bonding surface as cleanly as possible. Disconnect the corner cable (which you already have done) and "throw" the boards out as they are of no use now.

Search around on the forum for sharp aquos type threads that will outline a bit more of the effort.

NOTE: the process (tearing away the tabs) IS NOT reversible. IF you have chosen the wrong side (unlikely but you can confirm by testing with disconnecting the other little corner cable on the left side... you will likely get no picture as the set is trying to only run with the bad side connected... which will confirm that indeed the right side is bad).

IF everything goes as planned, your set will be "saved" and could work in this mode for a very long time... "long" is unknown however, my neighbor's set which I saved has been working in this mode for about 10 months now... and he smiles every time he sees me.... :-)
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Old 06-30-2016, 04:33 PM   #7
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Okay I will try removing right side tabs to screen, when u say it's not in spec what will be off about it, can u tell a difference.
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Old 06-30-2016, 04:39 PM   #8
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Alright let me double check I'm gonna pull the two little right boards upper and lower that are connected together. I'm gonna pull there bonding from the LCD screen. And I will no longer have these boards inside the TV.
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Old 06-30-2016, 04:41 PM   #9
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

while I have never known any manufacturer to put in technology / component just for the sake of putting them in the product. What's off? The forum is not a manufacturer design "shop"... I don't know of any posts from any one identifying an "issue"... most are so happy that their set works again that I don't think they are concerned that some "aspect" isn't quite "right".

Having said that, if you are expecting to "re-sell" the set as a "fully working set" then I think that is... an "issue" of "disclosure" which of course, is your "prerogative".
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Old 06-30-2016, 04:49 PM   #10
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

They are there to help the deselecting of rows be alot faster, bigger lcd panels have bigger capacitance in them so essentially just helps the panel work a little better, it will work with out them drivers but you might notice a little lower refresh rate and possibly the odd distortion here and there. They fail as they didnt heatsink them properly so they just get too hot and die.
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Old 06-30-2016, 04:52 PM   #11
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Okay I'll let you know how it goes
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Old 07-03-2016, 09:06 PM   #12
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Well guess what took the frame off removed the ribbons and she's fixed like new. I can't tell any distortion or anything. Thanks for all the help.
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Old 07-04-2016, 03:14 AM   #13
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Thanks for the follow up and another tv saved it looks a nice picture too on that sharp.
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Old 01-17-2020, 01:28 AM   #14
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

Hello! I am having same problem! How can I get more details about this fix? Will take apart tv tomorrow.







Quote:
Originally Posted by snake91876 View Post
Well guess what took the frame off removed the ribbons and she's fixed like new. I can't tell any distortion or anything. Thanks for all the help.
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Old 01-17-2020, 06:04 AM   #15
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

It's right there in this thread, read it carefully and follow procedure, do those tests described before tearing off tabs because it can not be reversed and only works for this specific problem. Take it slow do the tests to verify problem.
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Old 01-18-2020, 06:59 PM   #16
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Default Re: Sharp Lc-70le650u only backlight, weird screen on reset, no on screen menu.

First, I want to thank you for a reply! Appreciate it! Now, that I have some pictures taken and back panel is off, I will post them in new post with some explanation.
Hoping for your experience and support!
Thanks again!
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