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

[bohaboha]

Hi it looks like everything works don't know where to test except the 390v in the 2 capacitor in the hot side of the power supply and the weird 180v in the diodes in the cold side that should be discharged it is writin on the circuit no more you can read what is written on the circuit quite srrange color mixiing yellow and white
anyhow i couldn't t read anything else
the backlight is on strong and the screen does not get dark or very dark but no pictures
the mainborad feels a bit hott on the black part i test it to 52 degree's against 34 to 40 on the rest of it
any idea please help
am having problem to uppload som pictures

[bohaboha]

You can activate pmic voltages shorting trdy1&3 test points, for this test you must disconnect lvds cable.

thank you i ll try if i find those test points quite difficult to se any inscription

[Davi.p]

Samsung horse s**t, same as most of them, you can think about bad screen, or something very exotic else but the end is more or less not fixable , someone tries with ribbon cable pins masking but it's not professional solution, may it last some weeks, some months or?

[nomoresonys]

Start with a simple reset, unplug all cables from tv, unplug tv from power>press and hold power button on tv for 45 seconds>wait 2 minutes>plug tv into wall outlet and try it. If no joy, troubleshooting usually starts with checking voltages at powerboard. Tampatec explains it here for those that may need it, otherwise what are your voltages there: https://www.youtube.com/watch?v=XH9GfkGQX1I

[nomoresonys]

Also see if your optical light is lit on mainboard.

[Storyteller12]

Samsung horse s**t, same as most of them, you can think about bad screen, or something very exotic else but the end is more or less not fixable , someone tries with ribbon cable pins masking but it's not professional solution, may it last some weeks, some months or?

I agree, seems like all you need to be a TV technician these days is a roll for scotch tape. lol

[bohaboha]

Samsung horse s**t, same as most of them, you can think about bad screen, or something very exotic else but the end is more or less not fixable , someone tries with ribbon cable pins masking but it's not professional solution, may it last some weeks, some months or?

Yes Samsung today.
You really think bad Screen? the main board get a bit hot can be a direction .sorry i try to upload some pictures no success
Thank you so long

[nomoresonys]

Well you can do a little testing or you can ASSUME, your call.

[bohaboha]

Start with a simple reset, unplug all cables from tv, unplug tv from power>press and hold power button on tv for 45 seconds>wait 2 minutes>plug tv into wall outlet and try it. If no joy, troubleshooting usually starts with checking voltages at powerboard. Tampatec explains it here for those that may need it, otherwise what are your voltages there: https://www.youtube.com/watch?v=XH9GfkGQX1I

Hello and thank you it is very difficult to read what it says on this BN44-01056A but 400V on the main capacitor on the CNM801 connector 13.08v on the top part and 3.08v and 3.872h on the bottom part
those values are on the main board and the optical light is lit on the main board
please try to se if you can read a thing on BN44-01056A

[nomoresonys]

https://www.shopjimmy.com/samsung-bn...ply-led-board/

[nomoresonys]

Go ahead and check all the diodes on top of the board, tv UNPLUGGED, meter in doide mode, expect .3 to ~.7, reverse meter leads for ol or 1.

[bohaboha]

Go ahead and check all the diodes on top of the board, tv UNPLUGGED, meter in doide mode, expect .3 to ~.7, reverse meter leads for ol or 1.

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

[Diah]

i just read here Temperature messing and issue describing.... no photos at all... i did solved same issue on 75 size,,, this 70 i don't know if its same conflagration... so please upload clear photo on yours tv whole back and yours MB

[bohaboha]

i just read here Temperature messing and issue describing.... no photos at all... i did solved same issue on 75 size,,, this 70 i don't know if its same conflagration... so please upload clear photo on yours tv whole back and yours MB

You are welcome Happy new year i start mine with big problem to upload pictures on my windows so i do not get access to my pics i ll try to find a way to fix it just give a bit of time

[Davi.p]

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..

[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

[Davi.p]

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

[bohaboha]

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

did i complaint ? no just try to understand

[bohaboha]

ok here are some pics hope they are good

[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.

[Diah]

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