Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

[olegeisler]

Hi

A friend got this TV for free - been hanging in a meeting room, only used for a few hours. Physically as new, no dust, scratches anything....

BUT : Picture looks like the attached, one or sometimes 3 or 4 vertical green bars. I can see some menu text "OK" etc in the bar(s). First time after arrival the set had full picture but "scrolling" diagonally. ( No pictures of this, sorry )

Checked the obvious - all supply voltages OK. Exchanged T-con - no change.

Big questions is now : Can this be panel related ? A new mainboard is around 400 - 450 €, and he is willing to pay that - but if it then ends up being the panel.....

Any good guesses, or other input ?

The mainboard is DKEYDG216FM56 - I have full manual, but too large to attach here.

[zomi]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

bad panle from the looks of it
Looks like failed panel driver.

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

disconnect the tcon cables on that side, what happens?
you comment about "first time" is interesting. You might want to try "pressuring" the panel tabs, gently, in the area of interest to see if anything changes. Feed the set with a full video signal / test pattern. It might give you more clues.

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

disconnect the tcon cables on that side, what happens?
you comment about "first time" is interesting. You might want to try "pressuring" the panel tabs, gently, in the area of interest to see if anything changes. Feed the set with a full video signal / test pattern. It might give you more clues.

Ah !

I am a former tech, but no experience in flat screens - didnt expect this was possible :-)

But when I remove the Tcon cable in the side with the green verticals, the opposite side becomes OK at boot ( saw half the logo ) and also the OSD seems to appear (50% ) - and when I remove the opposite the green vertical reappear. See attached pictures.

It will go to the eternal LCD scrapyard - but it was for free, so

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

not so fast...
this is only some of the "test".... although the first picture (of the two), appears to indicate a problem with the panel, it is possible that perhaps there is an issue on the side that is impacting the image.

NEXT test is to keep all the tcon cables connected, then if you look closely in the lower corner of the panel, there is a white ribbon cable connecting the lower boards to the side boards. Disconnect that lower cable on the right side (looking from the front). What happens with the set/display? Again, as suggested, feed the tv a signal... menu displays aren't really that good for looking at display "details". I wouldn't give up quite yet on the set.

there are a few more "tests" that might help depending on the results.

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

not so fast...
this is only some of the "test".... although the first picture (of the two), appears to indicate a problem with the panel, it is possible that perhaps there is an issue on the side that is impacting the image.

NEXT test is to keep all the tcon cables connected, then if you look closely in the lower corner of the panel, there is a white ribbon cable connecting the lower boards to the side boards. Disconnect that lower cable on the right side (looking from the front). What happens with the set/display? Again, as suggested, feed the tv a signal... menu displays aren't really that good for looking at display "details". I wouldn't give up quite yet on the set.

there are a few more "tests" that might help depending on the results.

OK

Interesting result, see attached. No real external signal, I dont have that handy - but if it helps I can find a suitable source. It seems like there is now "full picture" but the "bad" side is somewhat dark.

Be aware that I put the set upside down ( should be obvious, but... )

So far TNANK YOU for the input

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

OOOOOKKKKKKKKK!!!!
I think. Not to raise your hopes too high but I think your tv is SAVEABLE.... :-)

Notice that the "vertical bar" is now gone... I think if I understand the picture.
Please try and feed a signal into the set that fills the screen... If you can some dvd's (or computer generated files) have test patterns on the extra features that provide a good screen that everybody will know about.

Basically, it is quite likely that your set has a side panel issue that may be saveable such that the tv will work fine. NOTE: there are a number of threads in the forum that shows that people have SAVED these sets (me included)... hence my optimism.

[ReeceyBurger123]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

Someone should take sharp to court over these 70" panels all total junk and they dont even refund or repair them for the time they last.

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

well... I am sure that the company sold "millions" and that of those, only a small number have issues. Of course, that doesn't help those with the issue.... but that's life in general. :-(

Anyways, to help with the testing and ascertaining the issue, IF you repeat your test by removing the other corner white cable (on the opposite corner) while replacing the other corner cable ... are you confused yet ... :-) you will likely find that the set / display won't work. This continue to confirm which side has the potential issue.

My fingers are crossed that the dumpster won't get this set just yet... :-)

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

OOOOOKKKKKKKKK!!!!
I think. Not to raise your hopes too high but I think your tv is SAVEABLE.... :-)

Notice that the "vertical bar" is now gone... I think if I understand the picture.
Please try and feed a signal into the set that fills the screen... If you can some dvd's (or computer generated files) have test patterns on the extra features that provide a good screen that everybody will know about.

Basically, it is quite likely that your set has a side panel issue that may be saveable such that the tv will work fine. NOTE: there are a number of threads in the forum that shows that people have SAVED these sets (me included)... hence my optimism.

Please see attached - digged out an adapter and a long HDMI cable. The last one ( first page of a PPT with white background, saying "Paris" ) is the best - show the darkened pice of the screen.

Will try the "opposite corner" FFC as well and update.

Thanks everyone

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

OK

Opposite corner ( left ) FFC disconnected, right reconnected gives full screen "green" picture

Reconnecting both almost similar - see attachments.

Reconfirmed that removing the "right" corner FFC gives full picture, just with some missing "light" in the right side.

Also pictures of the side PCB, I removed the metal frame, also partially in the bottom ( here top ) - remember I work on it upside down.

Failed to find any clue on how to recover this. Tried to poke around physically ( only LIGHT pushing !! ) on the side panel - no change to better or worse.

Ideas welcome

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

thanks for the update and the information. The pictures look good. :-)
I don't see any issues (expected) with any sort of "lining" coming from the side (right side normal, left side upside down... I think). Usually, when there is an issue with the side tab drivers on the panel, there is some sort of visual problem visible on the panel when you do the type of "test" that you have done.... not always but the "failures" that I have seen have a wide range of "results". In your case, it would appear that the somewhere on the right side, an issue has developed that is impacting the lower driver on the lower board such that it caused the vertical "band". Once you temporarily disconnected part of the "issue", the lower driver board was able to continue its functioning correctly. That is great. Your "test" of the other side will help confirm this "internet diagnosis". Further depending on how good you are, you might want to check the cables / connectoers running from the tcon to the lower edge boards. The ones at the tcon are easy to get at and check their seating (and of course, you have already played with them in previous "tests"). The ones at the edge boards are more difficult but they may not be well seated and might solve your problem ALSO, IF you reseat them.... maybe ... in which case that would be great. Further, there are "brown flex cables" running between the lower edge boards. Check the seating of those as they might also be a point of issue. Once all those checks are complete and IF they don't result in success (ie. totally clean picture", don't despair, as your set can likely be return to "great picture" by following the "save process" of removing the tab drivers along the bad side (ie. right in your case. BUT NOTE... this is the "end step" ONLY. It can not be reverse if you are wrong. Hence, the "testing" to make sure that the problem has been completely analysed. Again, in your "spare time" look at some threads of successful saves of these sets by removing the tabs... I think you will be happy.... :-)

PS... I see we are "cross posting"... thanks for the update. I think I am confident that your right side tabs drivers have a problem. Ultimately, IF your removed them as described in other threads, your picture will be as good as new with no visual issues.... the darkness will be gone, colors will be good, the world will be better with one less panel in the dumpster... :-)

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

Well, I have like 40 years total experience in electronics, working in a R&D environment today though - so quite different. But, I spent 25 years repairing electronics of all types - and I dont dare to think whether the number of caps I replace might go to 6 figures :-)

I can routinely change 0402 SMD parts, or fintepitch ICs. I have access to BGA replacement equipemnt too ( cannot operate myself though :- ) )

So, I am just fine. And this is great help in a field where I have little knowledge.

Based on your input, I assembled everything and powered up the set. The driver IC on the upper ( for me lower ) is burning hot, the others doesnt heat up. So - I will conclude this one IC on this tab has failed.

Can I just disconnect this tab ? ( Easy ! )

If yes : Should I disconnect ALL the connections to this tab, or only some ?

How will this affect the picture, any idea ? ( Not that it matters too much, it cant get worse :-) )

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

thanks for the info... that is also another "test". Anyways, as I indicated, you need to remove the tabs on the side (all of them) that is in trouble. The picture will be as good as new. The only thing this will impact is "screen lag" which will only be an issue for gaming. Normal tv will not be impacted. Again, read a few of the threads in the forum on people who have done this. The tabs CANNOT BE FIXED... removal is the only option.

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

Yeah. Done it - seems to work, some vertical lack of resolution in the "bad" side though. But really - this is for free, and I am sure he can watch TV on it - and when it fails again. or he gets enough of it - well, he can buy another set.

Working in electronics hardware design today, I will say that this is a design flaw. You have METERS of PCB, I saw 3 (!!!!) decoupling caps. Just a small ESD flash, or even just ringing on the lines can easily render these chips useless..... This is a design that would never pass our design review, but I am sure these designers only had COST COST and then COST on their mind, due to management push......

Thanks again !!!!!!

[budwich]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

glad it worked out... not sure about the "lack of vertical resolution" though. Picture please if you can with a test pattern would be nice... thanks

[olegeisler]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

It is very visible if I use a picture in full HD ( from my PC ) - could not find a full HD testpattern, but this one also makes it visible.

Small issue, I am certain it cannot be seen on a moving picture....

Again, thank you, thank you !!

[Sharpowner]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

I have the same television and one day it just look like this

What should i try to do or should i just send it to the trash

Was going to start a own thread but because its same model i post here

[nomoresonys]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

do the tests in this thread, hold off on final procedure til you are pretty sure its the same problem, because it can not be reversed as mentioned, lets see what test results you get.

[dskall]

Re: Freebie SHARP AQUOS LC-70LE747E - Only green vertical bars with some content

Is that with a video input?