Looking for some help please. Samsung UN75RU800DFXZA rebooting, no picture, clicks

[Diah]

yes they are TVS diode.... unplug the U ribbon first and test them in Diode mode

[joel warren]

which pins should I be testing on and what results should I be looking for?

[Diah]

actuality at Operation the defect will get hot ,
by DM diode ( PeepTon) do it 1 to 4-5-6 and reserve way like wise to 2 & 3. .. write the value on paper and compare all three reading .

[joel warren]

I am getting zero readings in diode mode besides continuity between pins 2&5 on each tvs diode

[Diah]

2 and 5 they are connect together ,,, if you say so mean no one defect... !! strange for me... you may telling the wrong side by right and left.... lol.... the side which u disconnect and u have picture on the rest... this disconnected side must test esd diode on it as u have 3 on each side

[joel warren]

[joel warren]

the 1/4 of the tv with the "no picture" note is the one that has no picture and also the side with the buffer board that I was testing the tvs diodes on. I tested the diodes on the opposite side of the tv and have the same results.

[Diah]

the 1/4 of the tv with the "no picture" note is the one that has no picture and also the side with the buffer board that I was testing the tvs diodes on. I tested the diodes on the opposite side of the tv and have the same results.

then block CKV line on the U ribbon side which it was on yours hand... you have the pins NO of CKV printed on the boards... give try

[Diah]

however it still strange for me, as 75 RU Panel even you smash it will display picture.

[lotas]

2 and 5 pins are common (GND), you need to measure between 1 and 2, between 3 and 2, 4 and 2, 6 and 2.

[joel warren]

zero readings on anything.

[joel warren]

I will try the tape method on CKV 1, 2, 3, 4, 5, 6, 7, 8

[Diah]

I will try the tape method on CKV 1, 2, 3, 4, 5, 6, 7, 8

good luck... even you succeed to have the set stay on.... you can track the line over the LVDS socket at MB.... T-CON on MB do funny things too..

[Diah]

2 and 5 pins are common (GND), you need to measure between 1 and 2, between 3 and 2, 4 and 2, 6 and 2.

75 RU series 6 & 7 was build on buffer boards 4 ESD Diode E5 with 6 pins, this what i have under my hand before.. they were not defect but at time i block CKV 2, was no reboot. from this point i always work on MB before i missing at panel buffer boards... one time was R 100Ohn besom more than 120K .. other one one cap was absolute shorted 0

at the end i want to say... if with out any Jumpers on FB test points... by disconnecting U ribbon on ODD Panels size only if you got picture on the rest clear... invest yours time on MB if the ESD are fine

[lotas]

Without a jumper on the FB and with the U cable disconnected, there will be no image, since the feedback between the T-CON and the panel will be disrupted.

[Diah]

Without a jumper on the FB and with the U cable disconnected, there will be no image, since the feedback between the T-CON and the panel will be disrupted.

he have double LVDS not one style. if this true only with FB connected come U ribbon then for me 99% T-CON on boards. or its spi firmware RU some things was better than TU or NU or MU

BTW.... his issue reboot... if one LVDS disconnected an no more reboot but no picture this will never tell Panel issue

[nomoresonys]

So if tvs diodes check ok and not getting too hot, check the other things on that board, I see some caps and a resistor.

[nomoresonys]

Thinking I recall a while ago there was a tvs diode problem even tho it checked ok with diode testing.

[joel warren]

Ok. Have any extras????

[nomoresonys]

Extra whats? Check those 3 caps and the resistor, don't really know what else it could be, seems like it can be one of the tvs diodes, a component on that driver board the panel itself or a problem on mainboard as Diah mentioned.