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

[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

[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]

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

[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]

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

[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]

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

[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

[nomoresonys]

Can you post a good clear photo of this area?

[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

[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

[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]

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

[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]

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.

then please Diah tell me what to do to solve the problem

[Diah]

then please Diah tell me what to do to solve the problem

well for me all Panels with sizes Even Numbers such 50 60, 70 are rubbish,
as i wrote before the one i solved was 75.. and the issue was at the chip DC-DC Converter as you have on boards VPMS2GMB

[EazyBone]

well for me all Panels with sizes Even Numbers such 50 60, 70 are rubbish,
as i wrote before the one i solved was 75.. and the issue was at the chip DC-DC Converter as you have on boards VPMS2GMB

I have this same experience. 50/60/70 are shit. They short and die too much, 60 is the best of the 3 but they suck!

[bohaboha]

well for me all Panels with sizes Even Numbers such 50 60, 70 are rubbish,
as i wrote before the one i solved was 75.. and the issue was at the chip DC-DC Converter as you have on boards VPMS2GMB

ok sure all the panels are what they are and that's what we get from people but your answer is not of sore help thought you would give me a more thorough guide on how you have fixed yours even though it was a 75 very grateful for all the info thanks or maybe a link

[the Benninger]

Discard the tcon, and the main board, because power supply is not your case

[Diah]

ok sure all the panels are what they are and that's what we get from people but your answer is not of sore help thought you would give me a more thorough guide on how you have fixed yours even though it was a 75 very grateful for all the info thanks or maybe a link

what kind of guide you are looking for ? i wrote the issue was VPMS2GMB ... if you don't have the ability and instrument to approve yours converter work and provide all V DC to the chips and T-CON On boards and SoC..!!!
what i should write.. search after data sheet to learn where and how it converted V DC to T-con on MB and SoC. are you waiting from me to deep my head and instruments at yours room via web ?? funny.