Samsung UE55NU7026K always restart

[avalente123]

Hello

I have one LCD TV SAMSUNG UE55NU7026K and it starts, blink 2 times led, backlight on then about 4 seconds, restart again, but no logo appears on the screen. I disconect the power supply cable to the Mainboard and power is ok and backlight also ok.
With the mainboard BN94-12869G connect, the voltages are ok, 13 Volts and 3,3 Volts also.
I know that the problem is mainboard, but could be the software?
I try to find firmware for this mainboard but can´t find
Can any one give me some help?

Thank you

[EazyBone]

Re: Samsung UE55NU7026K always restart

This is a panel short. Disconnect one of the tcon ribbons going from the main board (if there's 2) and turn the TV on. Which ever one allows the TV on will be short. Investigate this first before replacing anything. Next, you can sometimes "repair" the tv slightly so that it's usable. Sometimes it appears perfect sometimes it will flicker or have lines or whatever by using a piece of tape to find the short on one of the pins. There is some YouTube videos about this. Before researching see if disconnect a cable will turn it on

It is not the main board most likely. I am new to this but I literally had a TV doing this yesterday and it's 100 percent a panel short in my case. For you, we will see. A piece of tape will tell you. Good luck

[avalente123]

Re: Samsung UE55NU7026K always restart

I forget to tell that already take out the flat cable to the panel from mainboard. For now it is not the panel.

[EazyBone]

Re: Samsung UE55NU7026K always restart

I forget to tell that already take out the flat cable to the panel from mainboard. For now it is not the panel.

You need pictures for us. The whole back as a whole and each individual board

[alfatv]

Re: Samsung UE55NU7026K always restart

I forget to tell that already take out the flat cable to the panel from mainboard. For now it is not the panel.

For now LOL

[avalente123]

Re: Samsung UE55NU7026K always restart

Here the photos from TV

[lotas]

Re: Samsung UE55NU7026K always restart

You have two loops, so that the TV would turn on without these loops disconnected from the panel, you need to put a jumper on the motherboard between the points FB_TRDY_1 and FB_TRDY_3.

[avalente123]

Re: Samsung UE55NU7026K always restart

i made jumper between the FB_TRDY_1 and FB_TRDY_3 but same problem. I will buy a used mainboard for test. Then i wiil write results. i am afraid that panel have something wrong, but need to find

[zwarder]

Re: Samsung UE55NU7026K always restart

Try blocking ckv lines with tape method worked for my 6 series