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

[joel warren]

TVs diodes…

[nomoresonys]

No, have none, if you think one of them is the problem you can remove one at a time and check it, the tv will likely work without it. Maybe remove one try it, no difference, put it back on and remove the other etc.

[joel warren]

which one is the resistor that I should be checking?

[joel warren]

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

I blocked all 8 CKV lines on the U ribbon cable and the tv no longer clicks, the backlight stays on, but there is no picture.

[Diah]

I blocked all 8 CKV lines on the U ribbon cable and the tv no longer clicks, the backlight stays on, but there is no picture.

if you blocked all 8 CKV rails.... and no reboot... how about if you disconnect this U ribbon complete !! will you have same result ?

[joel warren]

yes. if I disconnect the left side of the U ribbon I get the same result

[Diah]

yes. if I disconnect the left side of the U ribbon I get the same result

so its... blocking all ckv are same to disconnect... this why need reduce yours masking. however i have doubt ... but you can try all 8 CKV messure them against TV chassis ... U ribbon should be disconnected.. check if you find one or 2 low Resistances

[joel warren]

I'm not sure I understand. would like me to measure between the chassis and the ckv? If so, can you please point out in one of my pictures where the CKV lines are on the board?

[Diah]

I'm not sure I understand. would like me to measure between the chassis and the ckv? If so, can you please point out in one of my pictures where the CKV lines are on the board?

I blocked all 8 CKV lines on the U ribbon cable and the tv no longer clicks, the backlight stays on, but there is no picture.

this what you wrote... the U ribbon when you disconnected... the pins you masked before at the socket pins measure them in Ohm against GND

[joel warren]

what ohm setting should my meter be on to test the pins? I have 2000k, 200k, 20k, 2000, 20

[Diah]

all ab to you.... its is adjustable value. that you can choice to make you able to find differences reading between all the 8 lines

[joel warren]

while on 2000k ohm setting. here are my readings.

[Diah]

while on 2000k ohm setting. here are my readings.

it sound to me you have issue in glass panel gate transistor .. install the jumpers of Feed back which easybone advised at post #3 and disconnect the U ribbon we are talking on... if no picture displaying... then MB need to replace... but keep in mind the damage at gate transistor which make damage at T-CON circuit at original MB could happen too after short time at the same test advised here.

[joel warren]

I installed the jumper again, removed the left side of the U ribbon cable and I do get a picture on 3/4 of the screen

[Diah]

set yous tv viewing to setting 3/4 at setting instate of wide screen or 16/9 and enjoy it ..

[joel warren]

thx. guess i'll be throwing it in the garbage.

[nomoresonys]

set yous tv viewing to setting 3/4 at setting instate of wide screen or 16/9 and enjoy it ..

+1000

[bohaboha]

+1000

is that means the screen is defect?

[joel warren]

Yes. Screen buffer board issue

[bohaboha]

Yes. Screen buffer board issue

screen buffer board many video they fix it some of them just take away some caps thats it not even replace them search you l se before you throw it .Don't give up, you've been helped by wonderful people here, be sure and keep going, they will absolutely help you if you do what they ask you to do