Need help testing an OLED TV | LG 55EC9300

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

if the test you did exact as i wrote.. the Main boards totally disconnected from power boards and the lvds to T-CON. and apply 12V from power boards socket direct to the T-CON F1 fuse then the result as you said.. its 100% panel but not at cells... you have the issue on the lower edge boards of the panel it could be COF burned or just leaking at ceramic caps too.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

I have run the test, the panel lights good on half(rotating r g b colors), and like the video on the other half, so bad panel or tcon
After a while it goes to a white screen with black areas

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

Sounds good! I'll try that

here the instruction how to let the PSU turned ON with out main boards connected.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

Sounds good! I'll try that

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

please read this threat to the end .. i do encourage you do the test i asked the owner to do at post #22.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

When the tv did not stay on with the Power cable removed from the TCON, I disconnected the LVDS cable between the mainboard and TCON also to see if that would work, but no joy.
It looks like it may be a main board as you sugested.
It could be like this guy, and be not repairable, as the problems look very similar.
I really appreciate all your help! Thanks!
https://www.badcaps.net/forum/showth...light=55ec9300

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

yes this test should be as normal power on and only the 24V disconnected between power boards and t-con.

I even tried to disconnect both inputs from the TCON without success.

what do you mean with other both inputs ? LVDS ? please always upload photo to clear what you are doing.

I noticed there is no heat pad between the cover and "processor" if that is what it is.Is the large chip supposed to have a heat pad?

this metal cover shield rules not to cool down the IC on T-con. its to protect the boards from external noise magnetic / signal wave..

if the test you did correct and the set didn't stay on. its much like Main boards issue as i mentioned at my post #7.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

Ok, I think the reason why I didn't get the LED was it was still in protection mode, I never exited the ponly mode, I can try again, now that I can turn the TV on with the regular power button, I'll try again
Edit:
no luck, I never see a led light

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

No luck there, I have never seen the optical led light on this set, I pushed a small wire in the door to keep it open, I even tried to disconnect both inputs from the TCON without success. I plugged it back together, and the screen no longer lights. i took the cover from the TCON, and there is no obvious problems, but I noticed there is no heat pad between the cover and "processor" if that is what it is.Is the large chip supposed to have a heat pad?

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

Here is a video of what happens, I will perform the test after dinner.
https://www.dropbox.com/s/ejm84hvc06...0dies.mp4?dl=0

its look from this video the issue not the panel .. waiting on yours test result i asked before.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

Here is a pic of the instant the TV faults and shuts down from the video.
I seem to have lost the ability to edit my posts.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

Here is a video of what happens, I will perform the test after dinner.
https://www.dropbox.com/s/ejm84hvc06...0dies.mp4?dl=0

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

I'll try. But it will be hard, because it happens for a very short time before tripping out.
If I disconnect the ribbon for that side of the screen, should the tv work normally if the OLED panel or driver is bad? Can the ribbon be switched left for right?
Is there any guide or manual on how to use the functions of the service remote?

NO
NO

service RC. you can use it for power it. and the "IN_STOP" it hard reset followed with inter code 0413. EZ_ADJ & IN_START followed with same code 0413 are for changing parameter at the main eeprom this you don't need.

Try this test. disconnect the 24V socket cable from Power Boards to the T_CON driver boards.. then switch it on see if the set will remain ON but with black screen. you could know that the set ON from the red LED indicator should lit ON at the Optic Audio Input.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

I'll try. But it will be hard, because it happens for a very short time before tripping out.
If I disconnect the ribbon for that side of the screen, should the tv work normally if the OLED panel or driver is bad? Can the ribbon be switched left for right?
Is there any guide or manual on how to use the functions of the service remote?

[Diah]

Re: Need help testing an OLED TV | LG 55EC9300

I bought a service remote, and was able to turn the TV on with the power only button, and for a couple of minutes the screen was looking good, then the right half went distorted and dark, and tripped out. I can turn it on again, but it trips out much faster than the first time.
When it starts I get a good onscreen display for 30 seconds now. What would the likely problem be? TCON maybe?

it is helpful if you uploaded photo on the screen behavior. some kind right screen distorted because of the main boards.. some kind of distorted half screen because of the low level edge boards of the panel. so i encourage you to start with edge boards you may find visible causer.

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

I bought a service remote, and was able to turn the TV on with the power only button, and for a couple of minutes the screen was looking good, then the right half went distorted and dark, and tripped out. I can turn it on again, but it trips out much faster than the first time.
When it starts I get a good onscreen display for 30 seconds now. What would the likely problem be? TCON maybe?

[speter]

Re: Need help testing an OLED TV | LG 55EC9300

I have the same TV, I don't see any cracks, and have forced PS_on, and DRV_ON I get all of the voltages including 24v at the TCON, Do the OLED panels light without the motherboard connected? mine does not.
Does anyone know how to reset the motherboard with the service remote?

[Pioneerx01]

Re: Need help testing an OLED TV | LG 55EC9300

IDK, I had a similar model (55EG9100) last year with cracked screen as well. I was able to turn it on, plug the laptop to it and at least get sound from speakers.

[Andrew F. Ali]

Re: Need help testing an OLED TV | LG 55EC9300

Once he screen has a fault like crack, etc the TV will go in 'self-protect' mode. The PCBs will be good. So store them for future use.

[Moreno83]

Re: Need help testing an OLED TV | LG 55EC9300

The only thing i know is that "Freakafter8" said that the mainboard goes into some kind of protection mode after turning on the defective tv for 5 or 10 times?

But it indeed does not work anymore when the panel is cracked. Like plasma.