Sharp LC-60LE752E Panel shorted?

[tom66]

Re: Sharp LC-60LE752E Panel shorted?

I saw someone doing it while the tv was on , very cool to watch.

https://www.youtube.com/watch?v=s7sFN7Iwx8Y

This is one I did while live at Leeds Hackspace. It was pretty funky.

[Davi.p]

Re: Sharp LC-60LE752E Panel shorted?

It's amazing this... i don't know if i will never understand well how a panel works but surely it's a strange thing you detach a piece and tv works better!
From Tom66 video:
1. it was not the same defect as the OP right?
2. The resulting image was quality better than the OP? (ghost image..)
thanks..
From Budwich:
"tape and more foil.... almost like a capacitor."
and why not opening up an electrolytic cap. and unroll it?

[Moreno83]

Re: Sharp LC-60LE752E Panel shorted?

It is the same fault , both panels failing.

[Davi.p]

Re: Sharp LC-60LE752E Panel shorted?

The OP said "It had no backlight, no picture but it did have sound."...
No because i can't understand well the video, the fault is unclear, i don't understand the speech, and i don't see the hands (my monitor is not so bright..)..

[Moreno83]

Re: Sharp LC-60LE752E Panel shorted?

My opinion is that the sharp completes a few tests before turning on the tv. In this case there was a short on the panel which led to a short on the t-con. He removed 1 part and that short was gone and tv completes it's cycle.

Toms video shows a fault with the panel on the bottom row. Same symptoms happen alot of on philips lcd's also. Removing the side taps on the side where the fault is will sometimes fix the problem. Not always as the fault can also be a tabbond problem.

[Davi.p]

Re: Sharp LC-60LE752E Panel shorted?

Tom removed all right side tabs right? The fault is the common one where there's an orizzontal line on the screen, up to this video is good, down to this video is delayed and/or darker and/or double image?

"My opinion is that the sharp completes a few tests before turning on the tv. In this case there was a short on the panel which led to a short on the t-con. He removed 1 part and that short was gone and tv completes it's cycle."

it is maybe that OP's fault is shorted side COF chip (it got HOT), Tom's defect maybe a broken trace in the glass or top/bottom tabs..
BYE.

[tom66]

Re: Sharp LC-60LE752E Panel shorted?

In my case it was an early generation LG Philips 37" 1080p LCD panel that used gate drivers on both the left and right of the panel. Removing one shorted driver meant that it was no longer pulling down the signals on the panel, restoring the image. However, the result of doing this is the driver on the left hand side of the panel is now doing all the work for that part of the panel. That may mean its life span is shortened quite considerably so I have decided not to sell the TV because I cannot give a warranty on it knowing this. It has simply been donated to the hackspace as a general use TV.

I only removed one driver, no need to put stress on all remaining drivers, but some faults will require removing all of them.

[Davi.p]

Re: Sharp LC-60LE752E Panel shorted?

OK thanks for explanation now is quite clear, bye..

[mkkillah]

Re: Sharp LC-60LE752E Panel shorted?

It is unlikely to be a magnetic "helper".... as I don't think your body / thumb is magnetic. Anyways, I would suggest you try fashion some sort of "ribbon capacitance". Try some double sided tape or maybe some mylar tape. Place it over the contacts. Make sure it is wider than the "next step"... get some aluminum foil and place it over the tape ensuring that NO aluminum is extending past the tape... you don't want any conductive material on the contacts. You also then try a second layer... tape and more foil.... almost like a capacitor.

Thanks I'll try this! I don't have any double sided tape at the moment so I'll go and get it this weekend.

[Moreno83]

Re: Sharp LC-60LE752E Panel shorted?

Ps , the fix on this sharp tv will be a temporary fix also. It might last a week or maybe a few years. There is no garranty it will continue to work.
Put the backlights to 50/60% and dont stress the panel to much

[Davi.p]

Re: Sharp LC-60LE752E Panel shorted?

"and dont stress the panel to much "... Whatcing only green hills and sea with beaches? :-)

i've noticed that side tabs remains cold but top/bottom ones go very hot, without one side of tabs the other side increase hot or it increases the top/bottom of that side? If the second he can put thermal pads between tab and metal bezel to last longer..

[tom66]

Re: Sharp LC-60LE752E Panel shorted?

Ps , the fix on this sharp tv will be a temporary fix also. It might last a week or maybe a few years. There is no garranty it will continue to work.
Put the backlights to 50/60% and dont stress the panel to much

LED backlight has nothing to do with panel lifespan.

The best content to display on the panel, in terms of gate driver reliability, is a 50% grey signal. However that gets boring quick .

[Moreno83]

Re: Sharp LC-60LE752E Panel shorted?

I know but the LEDS are always failing on these LED tv's , so i meant if he wants a more reliable tv he should put the backlights on 50/60%.

[mkkillah]

Re: Sharp LC-60LE752E Panel shorted?

I know but the LEDS are always failing on these LED tv's , so i meant if he wants a more reliable tv he should put the backlights on 50/60%.

It's edge lit though. Do those TV's have the same problem? I've ever only seen Backlight LED's fail.

[mkkillah]

Re: Sharp LC-60LE752E Panel shorted?

Sorry for the late update.

I tried many layers of tape and aluminium foil to create my own capacitor but it didn't work. I ended up buying a bunch of different capacitors, cutting them open and roling them out. AND IT WORKED!


I had damaged one of the lines earlier so it isn't perfect. I attached them with tape (the strong kind) and hot glue. If you're really carefull with taking them off you can probably get it perfect again.

If anyone else ever wants to try this as well. the uF is the important thing. Too much and it'll look the same as with the tabs on (half black). Too little and it's not gone completely. Somewhere in between 100-500 uF. It depends on the severity of the problem.

This removes ghosting and horizontal lines as well!

See pics.

[budwich]

Re: Sharp LC-60LE752E Panel shorted?

wow... glad it worked out. Of course, you didn't take pictures of your "frankenstein capacitor", did ya? Might help with others to give them an ideas of how to proceed if they need this type of operation.

[mkkillah]

Re: Sharp LC-60LE752E Panel shorted?

wow... glad it worked out. Of course, you didn't take pictures of your "frankenstein capacitor", did ya? Might help with others to give them an ideas of how to proceed if they need this type of operation.

Yeah sorry about that... I was actually getting pretty pissed off by assembly and disassembly a thousand times. I didn't want to do it all over again.

Instructions:
-Take off the bottom part of the capacitor with cutting pliers.
-Take out the roll try not to damage it. Damage it and you throw it away.
-Try to find the beginning of the roll like with tape and carefully unroll the capacitor this way.
-After you unroll you have layers of paper like material in between the aluminium strips.
-Hold the material with the aluminium in between against the connectors (tabs removed) with the TV on (DONT TOUCH IT WITH THE ALUMINIUM) and see if there is a reaction. Compare it to wetting your finger and holding it against the tabs to check the difference
-Once you found that it works fold or cut the capacitor to size of the tab (I folded) and stick it against the tab with strong tape. Make sure it's tight and no aluminium touches the tab connections.
-Now check the TV. If it's perfect use hot glue to permanently fasten it.
If not try to mess with it a little or just redo the process from the start.

That's it! It'll work, but I don't know for how long this works since you're still taking capacitors out of their shell. I don't know how long until they are dried.

[budwich]

Re: Sharp LC-60LE752E Panel shorted?

good stuff... sorry I wasn't trying to get you to open up the tv again... I know that isn't any fun (I played with a 70 in). Anyways, your hot glue idea may help the dielectric from drying out hopefully. Good job and good luck with your saved tv.

[Davi.p]

Re: Sharp LC-60LE752E Panel shorted?

Maybe you have to use gloves 'cause as i know the capacitors are poisonous..

[skynetronics]

Re: Sharp LC-60LE752E Panel shorted?

Hi guys,

I am writing to you from Chile. I have a problem similar to the one in the topic on a Sony KDL-60R555A. The original problem was that it turned on with the backlight, it had sound, but no image.

Reviewing the T-CON I realized that the famous "COXA" MOSFET that was discussed in other topics was shorted between Drain and Source. I replaced it with a Si2308BDS (MOSFET 60V x 2.3A) which far exceeds the characteristics of the original and now I have an image, but after 5 to 15 minutes of use the right part of the screen (viewed from the front) begins to show blurred as per the attached image.

Will I have to apply the same surgery that @mkkillah applied or can I check something before doing that?

Thanks in advance and of course i'll keep you informed.