Samsung UE50TU8000K no picture or lanes on it

[Dobsuk]

Hi guys, i am dealing with one Samsung 50TU8000K which was without picture - just was resetting itself constantly. Saw some videos and read some post about simmilar issue and the advise was to try to tape cut off method and started to put tape on some of the pins on this ribbon cable:


And then i had picture but with lanes. Tried different pins and combination but could not managed to make it work without any lanes so far. Will keep playing with it though.
The weird thing is that i tried it again without any tape on the pins and now i have picture with just few lanes on the rhs of the screen, watching it in front of it.



And i am wondering now what could happened so to have picture now and should i keep trying to cut some of the pins with tape by any chance to make the picture without any lanes?

Any advise will be really appreciate.

This is the set from back view:

[Dobsuk]

Re: Samsung UE50TU8000K no picture or lanes on it

I noticed today that one of the horizontal lines is flashing slowly...if that helps somehow.

[Biruslapio]

Re: Samsung UE50TU8000K no picture or lanes on it

The fault did not go away by itself is all I can say, the TU series is known for lasting 1 year then developing horizontal lines or have no image at all.
Put the tape back and mask the pins until you don't get lines and/or flashing.
This "recovery" is common, the longer the TV is off, the more time the panel will last until it gets into terminal state.

[Davi.p]

Re: Samsung UE50TU8000K no picture or lanes on it

use a mini drill with diamond 1mm tip, hole in the connection between bad row and bad gate driver, press the drill at pulses, stop when the line go away, tv must be on with still image

[Dobsuk]

Re: Samsung UE50TU8000K no picture or lanes on it

The fault did not go away by itself is all I can say, the TU series is known for lasting 1 year then developing horizontal lines or have no image at all.

I agree the fault did not go away by itself but honestly the only thing i can do was to put tape on few of the pins and got some distored picture at some of the pins and finally i tried again without any tape and got the full picture but these vertical lines. I will try to play with the tape again.... just need to recharge a bit patience

[howardc64]

Re: Samsung UE50TU8000K no picture or lanes on it

I will try to play with the tape again.... just need to recharge a bit patience

Posted a slide summary on Samsung 4K panel connections. Can help you understand what all the flex connection pins are

https://www.badcaps.net/forum/showthread.php?t=118541

A couple of additional notes

• Use small paper cutouts to block off pins can go faster
• You are probably blocking off CKV* and CKVB*. I think there are 4 of each. And STVP1. This older panel repair doc seems to suggest STVP1 has to be masked off in conjunction with the right CKV* CKVB* signals.

https://www.electronica-pt.com/esque...-repair-65862/

[Biruslapio]

Re: Samsung UE50TU8000K no picture or lanes on it

The most accurate and controlled way to do this is removing the resistors in the affected side panel board directly and replacing them with soldered jumpers, then removing one by one until you get the best picture possible, that is more precise however it requires significantly more effort than just trial and error with the tape.

[nomoresonys]

Re: Samsung UE50TU8000K no picture or lanes on it

The most accurate and controlled way to do this is removing the resistors in the affected side panel board directly and replacing them with soldered jumpers, then removing one by one until you get the best picture possible, that is more precise however it requires significantly more effort than just trial and error with the tape.

Is there any reference, video or other that we can look at for this technique? I'm always on board for an easier way.

[Biruslapio]

Re: Samsung UE50TU8000K no picture or lanes on it

https://www.youtube.com/watch?v=5PPPeFjplIU
The OP of another thread about a TU samsung linked this video, it is in spanish but the information is clear on what is the method being used, watch from 11:00 forward, 16:30, and 23:50 for the final result.

[Dobsuk]

Re: Samsung UE50TU8000K no picture or lanes on it

• Use small paper cutouts to block off pins can go faster
• You are probably blocking off CKV* and CKVB*. I think there are 4 of each. And STVP1. This older panel repair doc seems to suggest STVP1 has to be masked off in conjunction with the right CKV* CKVB* signals.

https://www.electronica-pt.com/esque...-repair-65862/

Thank you, Really helpful PDF docs and advises. Unfortunately i am a bit busy in my work now and maybe will go for papre cutouts method when i find time as this is really consuming work

[Dobsuk]

Re: Samsung UE50TU8000K no picture or lanes on it

The most accurate and controlled way to do this is removing the resistors in the affected side panel board directly and replacing them with soldered jumpers, then removing one by one until you get the best picture possible, that is more precise however it requires significantly more effort than just trial and error with the tape.

Unfortunatelly I am not profesional TV electician. Just doing this as a hobby and do not have the neccessary equiment for this method. Thank you anyway. I am sure it will be helpful for all of us here.

[Donny2derby]

Re: Samsung UE50TU8000K no picture or lanes on it

The most accurate and controlled way to do this is removing the resistors in the affected side panel board directly and replacing them with soldered jumpers, then removing one by one until you get the best picture possible, that is more precise however it requires significantly more effort than just trial and error with the tape.

Would it be an idea to play around with the tape method until you find the best configuration of pins to block then follow those pins back to their respective resistors and make the changes you suggest?

[Biruslapio]

Re: Samsung UE50TU8000K no picture or lanes on it

That seems redundant, and extra work for the same result.

The disavantage to using the tape is the inability to block individual pins, for example, assuming the TV would give the best image with clock lines 4 and 6 blocked, but tape would block 4, 5 and 6, this is when removing resistors would be the superior method.