TV Samsung UN75NU6900FXZA

[Diah]

802, 3,5,7,9 are the A13, so they look ok. 8 was 4.5 Diah.

ok.. thx... its 9 not 8 as it look on my screen lol

[Diah]

then psu ok.... need to do following
MB and BL connected..
slide out the cable of oin 8 from the socket 802 ( isolated to be sure not do contact to any other or chassis ) and do jumper from pin 4 to pin 8... plug in wall and tell the result

[alfredomfr1]

Cable of pin 8 out, pin 4 and pin 8 connected, same result that post # 3.

[Diah]

need to inspect DC to DC on MB... but before that you need to be sure again about the panel if there issue ny disconnecting U ribbon cable not the 2 LVDS

[alfredomfr1]

Sorry for the delay I was out of the town.
I disconnected the screen ribbon cables (no the LVDS) first one and then the other and finally both with the same result: STBY pin fluctuating between 3v and 7v

[alfredomfr1]

No red light on the front

[nomoresonys]

Try some simple tests if you have not yet, with tv unplugged, check all the diodes and resistors on top of the powerboard.

[alfredomfr1]

That was the first thing I did, this board has become a puzzle for me.

[Diah]

man yours set 76... on each side of the panel edge buffer boards which are under the speaker you will have U ribbon cable.,,, disconnect one a time see if u have boot complete

[nomoresonys]

Report results of Diahs test, important to do tests in order, I think Diah starts with the simple things first, that's the best approach imo.

[alfredomfr1]

DM851C from left to right :
151.7v, 0v, 158.3v
DM852C from left to right:
158.8v, 302.1v, 150.5v

DM851C is that 0v OK?

[alfredomfr1]

Diah I already did, post #25 and 26#

[Diah]

Diah I already did, post #25 and 26#

no you didn't... U ribbon see them here have access to them and disconnect one a time

[alfredomfr1]

Yes, I already did it

[alfredomfr1]

post #25 and #26

[nomoresonys]

Can you post a good detailed picture of the bottom of the powerboard?

[Diah]

useless

[nomoresonys]

So you did the u ribbons then, not just the ones going from mainboard to driverboard?

[alfredomfr1]

[nomoresonys]

Ok, I don't know for sure but it looks like the middle pin on DM851C isn't going to anything?