Bad T-con or bad panel??

[budwich]

Re: Bad T-con or bad panel??

a somewhat different "tabbing" than some other sets as these appear to be quite large / long. Are there similar tabs on the oppose side?

Anyway, as mentioned, it is quite likely that "damage" in the bottom corner of the panel is causing issues with the side drivers associated with the tabs. Your likely best "hope" is removing the tabs on the "bad side". This takes them out of the "circuitry" for driving the panel and allows the far side to function correctly. Note this type of "save" has been done on various sets but I don't believe has been done on this particular set so there is risk that it may not work with this "design". Having said this, I don't believe you have much choice at this point. Further, how many edge boards are along the bottom of the panel... 1,2, 4?

[Alternet]

Re: Bad T-con or bad panel??

a somewhat different "tabbing" than some other sets as these appear to be quite large / long. Are there similar tabs on the oppose side?

Anyway, as mentioned, it is quite likely that "damage" in the bottom corner of the panel is causing issues with the side drivers associated with the tabs. Your likely best "hope" is removing the tabs on the "bad side". This takes them out of the "circuitry" for driving the panel and allows the far side to function correctly. Note this type of "save" has been done on various sets but I don't believe has been done on this particular set so there is risk that it may not work with this "design". Having said this, I don't believe you have much choice at this point. Further, how many edge boards are along the bottom of the panel... 1,2, 4?

The tabs in the picture are along both sides and none or connected to any external panel.

The tabs at the bottom are connected to 1 board on each side of the bottom. (2 boards on the bottom total)


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General question (for anyone that may know)

How does removing the tabs (on tv's where its been proven to work) not effect the image? Taking out one of the drivers should result in lost of a chunk of the picture, should it not?

[budwich]

Re: Bad T-con or bad panel??

My very limited understanding is that the side tabs use a form of "push pull" to cause the image signal to work on the individual lines and as such only one side is need to cause this to happen at a "basic level". The "dual sides" aid with panel response that some panels offer. You can readily see how this can be "true" (ie. one side only) by disconnecting the tcon to panel cable on the bad side. The remaining good side will have a relatively good picture and will function "perfectly". Knowing this you will then know that there is no way for a signal to stop at the half way point of the panel on a horizontal row.... unlike the vertical drivers which only service the panel in "singular fashion". Lots of threads on "tab removal success".

in terms of picture quality, there is some loss of uniformity across the panel which may be seen with uniform backgrounds, either bright or dark but overall in "general viewing" the display is very watchable. I have a 46 sony with this "save" and have done a 70 in sharp which is over 4 years old and still functioning daily.

[Diah]

Re: Bad T-con or bad panel??

i just wounder when the set UHD Type and the size 50, and OP said there was only 2 boards at the bottom of the panel connected to to T-CON via ribbon !!!

are you sure on these 2 boards you don't have U ribbon cable at the middle of each one ???

[Alternet]

Re: Bad T-con or bad panel??

i just wounder when the set UHD Type and the size 50, and OP said there was only 2 boards at the bottom of the panel connected to to T-CON via ribbon !!!

are you sure on these 2 boards you don't have U ribbon cable at the middle of each one ???

There are two ribbons that go from the tcon to the boards at the bottom. The tv has only two boards at the bottom of the screen (each board has several ribbon cables connecting it to the panel itself).

Nothing connects the two boards and the two boards are not "smaller boards" connected together. They are one solid board on each side of the bottom (though the circuitry may be as such that they have isolated parts, but I have not looked that closely at the circuitry of the boards themselves)

[Diah]

Re: Bad T-con or bad panel??

Nothing connects the two boards and the two boards are not "smaller boards"

to avoid any misunderstanding, could you please upload photo on the whole downside of the panel boards.. we faced here before users don't know about U ribbon

[Alternet]

Re: Bad T-con or bad panel??

to avoid any misunderstanding, could you please upload photo on the whole downside of the panel boards.. we faced here before users don't know about U ribbon

I will take a picture when I can.

What is the difference between 2 boards and 4 boards? Does it split the screen into 4 sections instead of two? Or is there more to it?

[Diah]

Re: Bad T-con or bad panel??

I will take a picture when I can.

What is the difference between 2 boards and 4 boards? Does it split the screen into 4 sections instead of two? Or is there more to it?

the difference not only at screen resolution as 4K .. but the U ribbon which it used easy to move from it place and can cause the same fault you have.

[Alternet]

Re: Bad T-con or bad panel??

Here you go. A picture of the bottom board on the tv. (this is the board for the dark side)

[Diah]

Re: Bad T-con or bad panel??

Here you go. A picture of the bottom board on the tv. (this is the board for the dark side)

you post 2 photos i merge them the main one there look broken line ( remarked with blue color ) on the thin film of + VCC on the effected side which it show dark on the other photo you posted. this all guess from the photo maybe its different in real.

[Alternet]

Re: Bad T-con or bad panel??

you post 2 photos i merge them the main one there look broken line ( remarked with blue color ) on the thin film of + VCC on the effected side which it show dark on the other photo you posted. this all guess from the photo maybe its different in real.

yes that side with the chipped glass is the dark side. I looked at that glass at first thinking it was the issue but it didn't appear to short that thin film line.

That's why I was asking if that dark spot is something that is common on panels.

So your thoughts are that the VCC line in the glass got shorted and thats what caused the black spot?

[Diah]

Re: Bad T-con or bad panel??

shorted or not this is not what we seeking.. we need the vcc to reach the effected side and the side along tab .

[Alternet]

Re: Bad T-con or bad panel??

shorted or not this is not what we seeking.. we need the vcc to reach the effected side and the side along tab .

I'll try and get a mesurement and see whats getting vcc tomorrow or Saturday.

[usaNC]

Re: Bad T-con or bad panel??

what happen here? Did you try "bypass?"

[mateuszdg]

Re: Bad T-con or bad panel??

hi all.I know its an old post but i have no idea how to start new post Can anyone help me with debug problem of tv giving some random pixels and lines. It does not come from tcon. Ether panel, ribbons or motherboard. Once i started moving tv around they change loction and some lines disapeared. Does it look to you as a pannel ribbons problem?