OLED55B7A-U black screen but powers on

[Woodstock]

I have a fairly new but our of warranty LG OLED55B7A-U TV that all of the sudden developed a black screen. Sound still works, once in a great while can get a faint ghosting to appear in background if you look real close. Using a flashlight close to the screen does not indicate a faint image is present.

Any thoughts on where to start and likely cause of problem?

Have toggled on and off, checked inputs, checked inputs with different signals, looked at all boards and connections for any signs of heat or smell. Found nothing so far.

Any help is appreciated.

[dskall]

Re: OLED55B7A-U black screen but powers on

Could use some good pictures of boards.

[Woodstock]

Re: OLED55B7A-U black screen but powers on

I tried to show front and back where possible. I have reseated all connections. One thing top note, the red standby light does flash three times when the TV is powered on. As mentioned previously, occasionally there is a slight ghosting for a second once in a while, certainly not every time.

[dskall]

Re: OLED55B7A-U black screen but powers on

https://www.youtube.com/watch?v=Ksa3...ndRepairTVs%2C

[nomoresonys]

Re: OLED55B7A-U black screen but powers on

would check all the solder joints in picture 2, hard to tell from picture but some of them don't look that great, examples of bad joints: https://www.google.com/search?q=bad+...ih=607&dpr=1.5

[Diah]

Re: OLED55B7A-U black screen but powers on

you said you have sound but the screen remain black... i would try first to send IN_STOP command to make hard reset for LG. also you can before sending In_STOP check if the Connector from power boards to the middle T-CON driver boards if you have 12V & 24V.. 24V are responsible for OLED

[Woodstock]

Re: OLED55B7A-U black screen but powers on

How do you perform the in stop function?

[lotas]

Re: OLED55B7A-U black screen but powers on

Check the voltage after these fuses (there is voltage on these capacitors).

[sintv]

Re: OLED55B7A-U black screen but powers on

Eh....LEDs usually

[lotas]

Re: OLED55B7A-U black screen but powers on

Eh....LEDs usually

What LEDs, this is an OLED tv, it has no backlight.

[Diah]

Re: OLED55B7A-U black screen but powers on

Check the voltage after these fuses (there is voltage on these capacitors).

we had before threat over here. it was same boards which the 24V socket burned out at the power boards side.

[lotas]

Re: OLED55B7A-U black screen but powers on

we had before threat over here. it was same boards which the 24V socket burned out at the power boards side.

Yes I remember.