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

[lotas]

yes now i understand thank you. now how to test those 2 esd diod Diah " 5R2P " pointed in the pics and no component get warm all over the buffer boards

Yes, there were never any problems with them, here in the photo there are control points, check the resistance with a multimeter between them (between 1 and 2, between 1 and 3,...., between 2 and 3, between 2 and 4, and so on) and between the ground, there should not be low resistance.

[bohaboha]

Because without the LVDS cable the motherboard does not see the panel and blocks all output voltages to the panel, that is why the jumper is installed (panel - motherboard feedback (T-CON)).

yes now i understand thank you. now how to test those 2 esd diod Diah " 5R2P " pointed in the pics and no component get warm all over the buffer boards

[lotas]

Hi without a jumber the backlight is on black (bleue) screen no pictures but no loop anymore and no components get hot on the screen ribbon even the esd diodes . the set do not respond to the RC yet..

Because without the LVDS cable the motherboard does not see the panel and blocks all output voltages to the panel, that is why the jumper is installed (panel - motherboard feedback (T-CON)).

[bohaboha]

Hi without a jumber the backlight is on black (bleue) screen no pictures but no loop anymore and no components get hot on the screen ribbon even the esd diodes . the set do not respond to the RC yet..

[bohaboha]

remove the jumper and do same test.. see if the screen show ... keep it in loop so you can check the esd diode if one of them got warm

with jumper and a smal tape on the left U ribcon it shows a picture on all the Screen for 3 second then loop. the esd diode never get warm in any situation with or with out a Jumper but maybe that IC near it or a capacitor are bad but no heat on them.
I am having problem to get into the Forum site from home i am answering from Bibliotek att home i get "connection not private " and not secure site ,
hope i will fix it soon.
i realy do not know what to do next maybe i ll go on with tape trying .but is ist problem with jumper and tape or i have to remouve the jumper to try the tape ?
thank you very much for your help

[Diah]

with ANA_DIM pin in place and the jumper and the left and middle side connected the TVn shows the logo then start loop

remove the jumper and do same test.. see if the screen show ... keep it in loop so you can check the esd diode if one of them got warm

[bohaboha]

all work now with jumper.. later after the issue cleared u can remove it

2 esd

with ANA_DIM pin in place and the jumper and the left and middle side connected the TVn shows the logo then start loop

[Diah]

all work now with jumper.. later after the issue cleared u can remove it

2 esd

[bohaboha]

we said put back ANA_DIM. and connect the left and middle side only.. see if there loop or not

ok sorry and with or without the jumper on feed back points? did you find that esd Diode on buffert board

[Diah]

we said put back ANA_DIM. and connect the left and middle side only.. see if there loop or not

[bohaboha]

the part of panel at yours last test which didnt show picture are shorted.... you need to show here the buffer boards of this part if there any esd diode installed on it

Hello new day new attempts. I have done new tests with ANA_DIM pin 2 disconnected and with jumper on feed back points.
looking to the screen
1) The left buffer board removed = no picture backlight on the TV goes in start loop and STB flash 3 times 3 flash.
2)the middle and the left buffer board connected start with the logo for two to 3 seconds, then no picture but backlight on, then goes in the start loop with STB flash 3 times 3 flash.
3)only middle buffer board attached = see attached picture no loop and no STB flash .
Diah here some pictures of the buffer board as you asked
pictures order from left to right 135133,135122,13508,134759,134708,134551 and 134502

[Diah]

the part of panel at yours last test which didnt show picture are shorted.... you need to show here the buffer boards of this part if there any esd diode installed on it

[bohaboha]

also put back the cable ANA_DIM in the socket.,
the feed back points are marked by lotas post#77

I made the test with jumper on those point market By Lotas and Pin2 unhooked . what do you think that result i get in my last post ?

[Diah]

also put back the cable ANA_DIM in the socket.,
the feed back points are marked by lotas post#77

[Diah]

i wrote you need to install the jumper on 2 feedback points on mainboards ... did you ?

[bohaboha]

same result as original MB.. right? optic port lit red?
install the jumper of feed back points on the MB, and disconnect U ribbon from half one by one
the response of RC could be the front IR on TV had different out put as yours.. you can disconnect it also if wifi disconnect it too

not really same result on the original i did have sound and the RC working in the beginning then something happened .yes the optic lit red. ok looking to the Tv the left U Ribbon unhooked the result is the screen is same as in post 97. the U Ribbon unhooked from the right side always looking to the screen big difference first it shows Logon Smart TV and some apps over 3 quarter of the screen but just for 3Seconds and then start looping but no picture this time and the standby lit 3 times 2 flashes

[Diah]

same result as original MB.. right? optic port lit red?
install the jumper of feed back points on the MB, and disconnect U ribbon from half one by one
the response of RC could be the front IR on TV had different out put as yours.. you can disconnect it also if wifi disconnect it too

[bohaboha]

remove pin2 from the socket and connect the replacement MB to PSU, be sure to compare the socket on MB are same component and circuit as the original,
main function you have A13V will be round 7.5V at standby and then go high after MB send Power_on and the BL to turn on when MB send BLU_ON. , if you got screen and optic port lit red we can deal with ANA_DIM

yes both of them are on but no pictures and TV not reacting for RC .pin 2 is removed

[Diah]

remove pin2 from the socket and connect the replacement MB to PSU, be sure to compare the socket on MB are same component and circuit as the original,
main function you have A13V will be round 7.5V at standby and then go high after MB send Power_on and the BL to turn on when MB send BLU_ON. , if you got screen and optic port lit red we can deal with ANA_DIM

[bohaboha]

Here some pics of the chart