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

[mitsu2k]

I am working on a Sony XBR-85X850G tv and I am puzzled as to what could be wrong with it. My friend took it to a repair shop where the shop stated they had replaced the Main Board and T-CON board but the problem remained unchanged. The repair shop said they felt that the panel was bad. I am not sure the panel is bad. I could be wrong but most bad panels I have seen the vertical lines remain fixed. However the vertical lines here move around and take on various colors and patterns, width, etc. Also, the display aspect ratio almost seems that it has shrunk to 4:3 as I can see black borders on the sides. I have factory reset the tv and when I try to make selections during initial setup, for the first few seconds I can see the items on the screen but I cannot select them. Meaning I do hear the "ding" sound as if it is moving from selection to selection but the highlight/cursor does not move from selection to selection. It could be that I am selecting things when I hit enter but the display is not registering the chosen selections. Very strange.

Any help, suggestions or advice is most appreciated. Please see photos.


p.s. I just wanted to mention that I also did check and clean all the ribbon cables.

[Davi.p]

Re: Strange problem with Sony 85" LED tv

100% panel fault, but which part? Distribution pcb or cof?? Seems a problem on the clock lines but all togheter means maybe an overload/overheating of a shorted cof, since gate signals are not involved with capacitors then leave them alone, the only your hope are protection diodes on dist. pcb..

[mitsu2k]

Re: Strange problem with Sony 85" LED tv

100% panel fault, but which part? Distribution pcb or cof?? Seems a problem on the clock lines but all togheter means maybe an overload/overheating of a shorted cof, since gate signals are not involved with capacitors then leave them alone, the only your hope are protection diodes on dist. pcb..

Thank you Davi.p, can you explain to me what the dist. pcb is and where it is located? Also what is "cof"?

[Davi.p]

Re: Strange problem with Sony 85" LED tv

dist. boards= the large short boards glued onto the panel, cof= the driver chips glued to the screen, not replaceable

[mitsu2k]

Re: Strange problem with Sony 85" LED tv

dist. boards= the large short boards glued onto the panel, cof= the driver chips glued to the screen, not replaceable

Thank you, you mentioned protection diodes. Can you please enlighten me on what these look like? I see 3 components on each side on the driver/dist board (total 6) right underneath the ribbon cable. They are marked D004, D005, etc. each chip has 8 legs. Can these be the protection diodes?

[Davi.p]

Re: Strange problem with Sony 85" LED tv

Yes are them, must remove them one by one with hot air and see, or if you are lucky you can locate the faulty one by measuring each clock line with oscilloscope or frequency meter and see the perturbated one

[mitsu2k]

Re: Strange problem with Sony 85" LED tv

Yes are them, must remove them one by one with hot air and see, or if you are lucky you can locate the faulty one by measuring each clock line with oscilloscope or frequency meter and see the perturbated one

Are these the protection diodes? I cannot find these part numbers or datasheet online.

[Davi.p]

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

first you must ensure them are the problem

[mitsu2k]

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

first you must ensure them are the problem

Yes I understand, that's why I need a datasheet so that I can know which pins are what so I can test with multimeter.

By the way, thank you Davi.p!! I appreciate all your help.

[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.

[R_J]

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

Amazing Microelectronic Corp. AZ1043-08F.R7G

[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

[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

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

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

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

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

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

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

of course..