Samsung QLED QE65Q7FNAT only standby light

[Kaar3l]

TV: Samsung QLED QE65Q7FNAT
PSU: BN4400940A
MB: BN94-12832K

I got the tv in spring 2024. At that time it started, then ran 60 sec and poweroff. Seemed like reboot issue. I didn't have time and room to check it in summer so I plugged it in and now the standby light is on. I press button on remote, standby light goes off and tries to start?. No picture or backlight on LCD. I thought about removing diodes like in this thread: https://www.badcaps.net/forum/troubl...ot-issue/page2
Could it be diodes or maybe even motherboard issue?

[EazyBone]

Start at first thing. Remove main board to PSU connector at the psu and see if backlights come on and stay on.

Reboot issue is not coming on for 60 seconds and restart.. it means backlights come on and flash and restart repeatedly with no picture so might not be that. Don't remove diodes until we nail it down. Do the above and report what happens

[Kaar3l]

I have the tv with big oneconnect box. When I remove the cable from PSU there is no power coming to power supply.
I did try to measure with everything connected voltages. And where should be 13V there is only 1V.

I also did measure voltages in big caps up on my pictures and these seemed to have 0v with powered on or off. So I am thinking that if 1) The power from oneconnect box doesn't get to the board. 2) The oneconnect box doesn't give power?
Next I will measure the outputs from oneconnect box and from the input to the tv-s motherboard.

[EazyBone]

You need to open the one connect box and then plug in and measure the 12v out puts. They pretty easy to open. I didn't know it had a one connect box.. disconnecting main board with OCB may not work for lights.

Just undo the 5 or so screws and you have to pry it open and check the fuses, probably 2, then if all good plug in and measure the 12v and stby etc. there should be a legend on it. These boxes are a big problem so just do that.

[Kaar3l]

Opened the connector box. Checked outputs. A13V and GND is 12,8V so it seems good. I did measure B350V and B_GND and it was 0V so no output of 350V. Does the conenctor box give 350V from start or should I short PS_ON with something to run?

One component seems dusty and "hot", but everything else looks fine.

[lotas]

A common problem with One Connect is the cable itself, check with a different cable.

[Diah]

with out one box cable connected the TV should work and show picture to connect the OB, so the BL will turn on..
also if you disconnect the LVDS on the right side when you look on screen... from back the left side will turn on with picture connect the OB

[Ruslan Shwarzbord]

Opened the connector box. Checked outputs. A13V and GND is 12,8V so it seems good. I did measure B350V and B_GND and it was 0V so no output of 350V. Does the conenctor box give 350V from start or should I short PS_ON with something to run?

One component seems dusty and "hot", but everything else looks fine.

Dear Sir, were you able to solve your problem with your TV?

[EazyBone]

Dear Sir, were you able to solve your problem with your TV?

Open a new thread, many TV problems are different, we can try to help

[Diah]

Open a new thread, many TV problems are different, we can try to help

you we he cant help at all.... samsung shit Korean ( with my respect to Korean people ) send some things via net to kill Q series....who has TV with out internet or under fritz box router are safe

[Ruslan Shwarzbord]

Open a new thread, many TV problems are different, we can try to help

I just have the same problem with the exact same model of TV. Can we figure out together what the problem is with it?

[Kaar3l]

I received new cable and tv works like charm.

[lotas]

I received new cable and tv works like charm.

Ok! Which is what I wrote about...(very fragile cable).