Strange problem with Sony XBR-85X850G 85" LED tv

[zomi]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

@davi.p would appreciate your advice on my thread https://www.badcaps.net/forum/showthread.php?t=114225
I have a similar issue maybe ?

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

aluminum tape/foil is better

[zomi]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Also kapton or similar heat resistant tape on the plastic connector

[zomi]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

You can try flux and retouch them with leaded solder
will make it easier to remove then.

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

the tv uses the diodes only in a case of over voltage so for a test aren't necessary, but must be populated next soonest possible. I have never done this procedure, i can only try to suggest you the smallest nozzle and the lowest possible air pressure with high temperature cause the diode packs are ultra small, you need a decent air station, some skill, good eyes, steady hand, a decent plier for smd works, no expensive things to be clear..
If you have a cutter with brand new blade you can try detach it by small pressure..

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

already said.. the problem them eventually get short under tension so you can't test them with MM, the only test that turns in mind is to heat them one per test with soldering stick then test if image is fully ruined at power on..

Now I understand what you are saying. Your are saying that the fail possibly is dynamic and only fails under load. So yes in this case it would be impossible to test with mm. The screen looks perfect for the first 1 or 2 seconds after powering on. But then the lines appear. So you are correct, the problem is dynamic. I am just so afraid of causing other damage while trying to remove them. The tv is very large and the panel boards sit at an angle so it is very difficult to get the proper angle. I do have a hot air station but that may be to risky die to the proximity of the ribbon cable connector. I will have to shield it very well. The blob of solder method may work but due to the angle of the board, I'm afraid solder will just run down the board. I will keep thinking of a good method.

Question, should the tv still work with those diodes removed?

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

already said.. the problem them eventually get short under tension so you can't test them with MM, the only test that turns in mind is to heat them one per test with soldering stick then test if image is fully ruined at power on..

[petehall347]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

if they are tvs diodes the fail is shorted . look up the datasheet pinouts and look for shorts . semiconductors have a habit of failing short .

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Davi.p, is there any method you know of to try and guess the possibly bad protection diode before I start removing one by one? What about freeze spray? I did try and get a temerature reading using infrared thermometer but I could not get any readings that seemed abnormally hot.

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

of course..

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

So you suggest removing the protection diodes one by one until the problem disappears if it disappears? I suppose I can try and do that. I have nothing to lose at this point.

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

that white horizontal line doesn't like to me, screen is Auo not Samsung so no trick

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Nooooooo! You can't affordably test them i gues, the fault is dynamically showed as i have said the shortest easiest way is to desolder them one by one until fault disappears. to find wich side board is you can didconnect one flat cable at a time or if it's a Samsung panel you can use the Samsung trick before... post a bright picture of the tcon

Sorry Davi.p, I didn't realize you had asked for a photo of the T-con. Here it is.


Also, Here are some photos when I blocked various pins of the ribbon cables with kapton tape

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Bad tcon has an uniformed mulfunction on screen, the whole screen is affected in the same way..

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Ok so you don't trust me, glad to hear, so i suppose you can continue by yourself...

I never said that. I appreciate your help. I am just asking a question.

Ok maybe you can explain to me what symptoms of a bad T-con look like?

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Ok so you don't trust me, glad to hear, so i suppose you can continue by yourself...

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Nooooooo! You can't affordably test them i gues, the fault is dynamically showed as i have said the shortest easiest way is to desolder them one by one until fault disappears. to find wich side board is you can didsonnect one flat cable at a time or if it's a Samsung panel you can use the Samsung trick before... post a bright picture of the tcon

Ok, when I disconnect one side of ribbon cable going from T-con to the panel (dist.) board, I get no display, no lines. Just backlight.

When I unplug other side of ribbon cable, I get lines only on same side.

The panel boards are total 4 boards. Each pair of 2 boards are paired together with ribbon cable. When I disconnect one side, I get some other type wide faded line on that side. When I unplug the other side, I get the exact opposite.

This is what makes me think it's maybe something else like the T-CON. I am puzzled.

Also I want to note that when I first turn on the tv from cold start, the picture looks good for the first 2 seconds but then the lines start to appear. It's like as soon as something heats up, the lines come.

[Davi.p]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Nooooooo! You can't affordably test them i gues, the fault is dynamically showed as i have said the shortest easiest way is to desolder them one by one until fault disappears. to find wich side board is you can didconnect one flat cable at a time or if it's a Samsung panel you can use the Samsung trick before... post a bright picture of the tcon

[R_J]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Amazing Microelectronic Corp. AZ1043-08F.R7G

[mitsu2k]

Re: Strange problem with Sony XBR-85X850G 85" LED tv

Is there any chance this can be a bad T-con board? I am just puzzled because both sides of the panel developed the lines at the same time.