Samsung UE70TU6905 BACKLIGHTS AND SOUND ON NO PICTURES BUT SCREEN NOT DARK

[Diah]

yours photo... the area and parts you marked no short at them... they related to the TV SoC as filter installed outside the SoC.
inside the Soc there are Coils and connection need to have filter no place inside the Soc for them.

[bohaboha]

The picture isn't very clear, is there little plastic bits poking thru the rear of board? If there is you need to squeeze them together a little to let them thru the board.

all of them are loose but the heatsink seems to be glowed in the middle. how shall i proceed with the short to eliminate

[nomoresonys]

The picture isn't very clear, is there little plastic bits poking thru the rear of board? If there is you need to squeeze them together a little to let them thru the board.

[bohaboha]

Can you post a good clear photo of this area?

here some pics do you have any idea how i can remove the black cover it seems to be glued or i do not know because it is a bit hot there

[bohaboha]

here 2 pictures with the position of the short the black cover is a bit hard to remove maybe i need to warm it a bit

[nomoresonys]

Can you post a good clear photo of this area?

[bohaboha]

now I have tested the main board and found short on R82 2051 and the 4 capacitor around and on the backside a few more

[bohaboha]

Those are odd readings, not sure what's wrong but that's not what a diode should read, simple diode testing there: https://www.youtube.com/watch?v=qhPZD9avoac

Sorry all of them are reading 0.439 stupid me using badly my multimeter because i get cold

[nomoresonys]

Hi I have done new tests on the diodes and they give completely different readings from right to left 3.5, NR , 4.1, NR ,1.2 , NR .1.5, NR a bit strange but nomoresonys they should not be discharged before testing them because it is written there Discharge

Those are odd readings, not sure what's wrong but that's not what a diode should read, simple diode testing there: https://www.youtube.com/watch?v=qhPZD9avoac

[bohaboha]

then the issue as expected at MB... the Video source switching on but no data deliver of video so the screen lighting with no image.
try use set Top box set it to low resolution then use it at this set at HDMI ARC port.. beside it plug USB stick on the root of it media Photo , movies... when you turn on try always the source on RC pressing once atime every 30 second

if there are no effect on screen then you have issue at the SoC ... look at the downside of MB where the SoC installed if there burn of heating.

I do not have or can not se the menu to handle the set Top box or do there is a way to do it without seeing the Menu?
on the backside of the MB there is no trace of burning yet even i felt it was a bit hot for the rest can you please explain it step by step if possible

[Diah]

Hi Diah no change when removing U ribbon it's like you haven't touched anything

then the issue as expected at MB... the Video source switching on but no data deliver of video so the screen lighting with no image.
try use set Top box set it to low resolution then use it at this set at HDMI ARC port.. beside it plug USB stick on the root of it media Photo , movies... when you turn on try always the source on RC pressing once atime every 30 second

if there are no effect on screen then you have issue at the SoC ... look at the downside of MB where the SoC installed if there burn of heating.

[bohaboha]

Seems like an odd reading, I would lift/unsolder one leg of the one reading 1.7 and retest out of circuit.

Hi I have done new tests on the diodes and they give completely different readings from right to left 3.5, NR , 4.1, NR ,1.2 , NR .1.5, NR a bit strange but nomoresonys they should not be discharged before testing them because it is written there Discharge

[bohaboha]

you have U ribbon cable one on each side at the middle of the panel buffer boards.. try disconnect one a time.

Hi Diah no change when removing U ribbon it's like you haven't touched anything

[bohaboha]

you have U ribbon cable one on each side at the middle of the panel buffer boards.. try disconnect one a time.

Hi I have done new tests on the diodes and they give completely different readings from right to left 3.5, NR , 4.1, NR ,1.2 , NR .1.5, NR a bit strange but nomoresonys they should not be discharged before testing them because it is written there Discharge

[Diah]

you have U ribbon cable one on each side at the middle of the panel buffer boards.. try disconnect one a time.

[nomoresonys]

Thank you for the link for the Diode Reading from right to left 0.691, NR ,0535, NR,1.7, NR ,1.5, NR all the reads are downgrading no reads are no reads from both side
just for information those diode had a big voltage of 188v when i test them in my previous post is it normal in the cool side?
thank you for helping me

Seems like an odd reading, I would lift/unsolder one leg of the one reading 1.7 and retest out of circuit.

[bohaboha]

ok here are some pics hope they are good

[bohaboha]

i understand nothing, if you have complaints about me, bye bye!

did i complaint ? no just try to understand

[Davi.p]

i understand nothing, if you have complaints about me, bye bye!

[bohaboha]

I don't want to go much ahead with these discussions, i can't say it is the panel 100% , on some models there are failing caps.or diodes in the panel strip boards, this is the hope for you as you can fully restore it, then i want only to express again, how it is light years far watching at a power supply at this type of issue, i only want to say this example to lift you from unuseful tests, when i was troubleshooting my Samsung in the previous month, i also provided power to the chain MB+lcd with a tested atx power supply, no differences! 20A 12v! There is only a secret to reveal for me, how does these tv manages the informations stored in the panel spi flash, since deleting it changes no things.. it's hard to understand,, you can read other topics on how to find and troubleshoot these common issues, last thing, i read last week a Samsung document, where they says they sells panels that came out of production with defects, then they repair short circuits with the use of laser and a special circuit design, this lets me think that those fix are not so durable, but this does not explain well how certain panels produces many bad lines at a time, i read that a portion of the panels are organic substance, also this is a clue that them can vary the working state with age..

hey bro you didn't want deep but here you were really in the darkest deep ocean you might be right but try doesn't hurt and you learn something or how and in the end it's just a repair