Lg oled65b9dla

[Proserot]

Hi all,

ive got an OLED65B9DLA here which isnt showing any picture. When turned on, the PSU delivers appropriate Power, as soon as 20V to T-CON is due, it ramps up to 20V then immediately stops, going back to 0V.

When removing the ribbon cables from TCON to Mainboard, it doesnt do this.

The red standby Led is on the whole time.

Sound isnt working either when connected to a Laptop, it does show up as the correct device tho.

I have a service remote but cannot actually make use of it as the TV wont turn on (i think?).

Before investing in the rather expensive Power boards, id like to make sure, or at least increase the odds, of knowing its not the panel which went over the rainbow bridge

[Diah]

Re: Lg oled65b9dla

start with upload photo of yours PCB and other close to pin chart of the socket which goes to MB at PCB side.. so we can tell you how to test the power boards as stand alone.

[Proserot]

Re: Lg oled65b9dla

https://imgur.com/a/ZTqivD3

Ive done some blind testing as im pretty new to TV fixing.

DRV_ON for example in 0V in OFF, jumps to 1.5v when pressing power button and returns to 0v. This might explain the absence of 22v for the Panel

[Diah]

Re: Lg oled65b9dla

the socket P251 on PCB it go to T-CON driver boards as 2 sockets 1= 12V and other 22V. the 22V socket at T-CON driver boards disconnect it from T-CON side and turn on the TV.... keep your eyes on the MB and Optic audio socket it lid red and how many LED indicator on the MB will turn on and remain on.

[Proserot]

Re: Lg oled65b9dla

If I remove the 22v Socket from TCON no change. Only once did the SPDIF connector light up for a second. Couldn't replicate at will.

With both 22v and 12v disconnected, its the same behavior.

Only if I remove the LVDS cables from MB to TCON is when the SPDIF lights and stays on.

I cannot see any other LEDs on the MB. Shall there be some?

[KYBOSH]

Re: Lg oled65b9dla

I cannot see any other LEDs on the MB. Shall there be some?

MBs rarely have LED indicators. That's usually on the t-con boards.
The only real sign of life a MB has is the fiber optical cable light.

[Proserot]

Re: Lg oled65b9dla

MBs rarely have LED indicators. That's usually on the t-con boards.
The only real sign of life a MB has is the fiber optical cable light.

What i thought. Ive seen (on service manuals) that some MBs have LEDs but cant make out any on mine.

[Diah]

Re: Lg oled65b9dla

dont spend money on it..Panel cells shorted.

[Proserot]

Re: Lg oled65b9dla

dont spend money on it..Panel cells shorted.

Thanks! Could you elaborate how you can conclude this? Still new to the TV scene and at least want to learn something from all of this


What's responsible for telling the MB to shut off because theres shorted cells?
Any measurement point to "see" the short with a multimeter?

[Diah]

Re: Lg oled65b9dla

you have on T-CON LVDS sockt 1 pins " Panel SOS" this deliver signal to MB Micom to turn off PCB and let it stay at STB. if you cut off this pin on T-CON side,, the Panel will light up. but you need to have ready fire extinguish close to you as the Panel 99.9% catch fire.

[Proserot]

Re: Lg oled65b9dla

Damn

Would I be able to measure that signal? Sounds like an easier way to know about a short than pulling cables ;D

And is it like one row, one cell or all cells shorted?

How can this occur? The TV was wall mounted for 2 yrs then just turned off while gaming and voilà.

Can I somehow test the power board and TCON for function so I can safely give them away?

[Diah]

Re: Lg oled65b9dla

1- will be one row or more shorted...
2- calculated yours 2 years use as how many hours was the TV on. and be sure LED / OLED Diode have limited life circle
3-at time you had disconnected the LVDS and the optical port remain red,,, mean
you have on PCB 12 , 20 V to MB and 22V 12V to T-con
4- if you put every things back as original and disconnect the 22V on T-CON ( be sure the 22V socket) when you plug it in wall the Optical will come Red and then off... you need to push RC power on or at service RC power only.

[Proserot]

Re: Lg oled65b9dla

4- if you put every things back as original and disconnect the 22V on T-CON ( be sure the 22V socket) when you plug it in wall the Optical will come Red and then off... you need to push RC power on or at service RC power only.

The optical won't come on when 22v disconnected from TCon. Will only come on if I unplug the 51pin LVDS.

I've read about some jumpers on the MB connector on Power board side, is this something which is applicable here? Anyways, what'd be the goal to achieve? Have the expected voltages on the pins to proceeded boot up procedure?

And many thanks for your explanations. I've read many posts from your, old ones too and you're like a TV god

[Proserot]

Re: Lg oled65b9dla

Oh and: The TV really has not a lot of hours on its back. Maybe 1 to 2 Hrs per day, gaming after work, if I'm not on PC Monitor.

Sometimes a whole week not one Minute of operating time...

[Diah]

Re: Lg oled65b9dla

above my point 3.. do it again and with yours DMM V DC negative refrence to TV chasis .. messure the 12 V and 22V on T-CON you have 2 Fuse F need to messure the voltage each on both side

[Proserot]

Re: Lg oled65b9dla

above my point 3.. do it again and with yours DMM V DC negative refrence to TV chasis .. messure the 12 V and 22V on T-CON you have 2 Fuse F need to messure the voltage each on both side

Yeah, they both 21.8v

[Diah]

Re: Lg oled65b9dla

Pcb ok.. T-con ok mb ok.

[Proserot]

Re: Lg oled65b9dla

Pcb ok.. T-con ok mb ok.

Thx!

Now when i was playing a bit i clipped in the LVDS while the optical port was red (MB running, connected to laptop via HDMI 1).

The TV didnt go to STDBY immediately this time. While i still got no sound, it usually just turns off on the spot when i did this in the past.

I couldnt check if i got any picture as its lying face down on the floor rn...

Is there a way to get it to display Test pictures? The Red green blue white things you do for driver board test?

[Diah]

Re: Lg oled65b9dla

if you have Fire insurance to yours house... Man stop playing with it regards to your safety.
this why there are "Panel SOS" signal.

[nomoresonys]

Re: Lg oled65b9dla

how about some pictures of all of this?