Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

[high-tech]

Hello Everybody, and good morning!
got this TV last night, I plugged it in and the backlight comes on. It won't turn off, no response pressing the power button other than a brief single flash of the red led and that's it. there is a double row header on the power supply that is going to the logic board, I can't find a pin ledger for that header but I have 12 volts going to the logic board on the top row of pins, 6 pins and the four middle pins all read 12volts to chassis ground. A shot in the dark seems like a firmware issue and I keep telling myself I need to tool up for flashing.

[nomoresonys]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

That's a good place to start if it will auto update, can you do a factory reset also?

[high-tech]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

I can't do anything All I get is a backlit screen... No picture no sound

[nomoresonys]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

Check and see if you have the legend of the voltages on the bottom/underside
of the powerboard.

[high-tech]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

I need ideas On these double row connectors, what can I use to probe beside the wires in the backside of where the wires go into the connectors? I need to be able to sample bottom row of pins while the power board is plugged with all wiring harnesses attached.

[nomoresonys]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

Small backprobes, I use stripped down bred ties in a pinch.

[Diah]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

1- remove the PWB and upload Photo over here of the back side.. same you can look on the table voltage which most time printed downside.
2- as the BL come on and 12 V reach MB, trace if you have 5.V on any of USB sockt.. also take look on the optical output sockt on MB if its red LED on or off.

[budm]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

Please upload better focused pictures of the boards, I can faintly see the pinout chart, if you look at the pictures and you cannot read anything on the board then we cannot read them either so loo at the pictures before uploading them, we do not have the TV in front of us to look at so to do remote troubleshooting we need good clear pictures.
The connector pinout chart is right by the heatsink with 4 devices mounted on top.
What is the power supply board P/N? BN44-??????
The connector pins are setup as ODD and EVEN column, the exposed pins you see on the top side are ODD number pins, the EVEN number pins will have to access them from the wire entrance of the connector or from the bottom side of the board.
Also inspect connector on both ends of the cable between power supply board and the main board.

[high-tech]

Re: Samsung UN55KU6300FXZA Version CJ05 Black Screen W/BL On

I've been gone for most of the afternoon, we are getting ready for some serious boat racing... When I get in later this evening I'll get on this, thanks for your replies, you guys are so helpful. I just love this place, its insane!!!

I did look on the back side of the power board for a pinout, and didn't see one but I found one on the front side almost in the middle of the board so i have a starting point to look at.