Lg oled tv oled77g7t no picture

[Roncruz]

I got an oled tv bought from a surplus shop it never had an issue before. the previous owner used it for atleast 3 hours of watching it never did showed a problem at screen, the picture is clear, no dead pixels and there is no shadow at all. on the other hand after a couple of hours of watching the tv went blank it as stated from the owner it just went out no response nothing. The tv got sold for as is and that is the time i got it and after bringing it home i just tried to plugged it in the screen showed a very thin line i can hear the click right after it powered up after that nothing else the optical port is lit what should i do in this case. Sometime its very thin line and it will just showed for atleast 2 secs and gone itried couple of times nothing happened.

[Roncruz]

The photo above that is the line showed in the screen

[Sam Scarbo]

As a first step check, i would suggest to open the case, re-seat all the flat cables, and look for any exploded caps or burnt components. Try to avoid messing with the fragile flat panel too much to avoid damaging something else there.
Good luck!

[Diah]

as you have optical port is lit on. mean no SOS signal of panel fault ... for me it sound you have Problem at the Power boards EVDD rail.. or the Fuse of this EVDD rail at the T-CON broken so check this 2 points..

[Roncruz]

Thankyou! Iwill post an update here later.

diah sam scarbo

[Roncruz]

I had checked the fuses and the voltage coming put from the tcon i do have 12v and 24 volts but this time tv is shutting off after 10 secs of running still dont have display

[Diah]

unplug only the evdd 24V socket from the T-CON side , and turn on see if the optical remain on

[Roncruz]

Iunplugged the evdd socket at tcon side and turn it on optical port is lit

[Diah]

Iunplugged the evdd socket at tcon side and turn it on optical port is lit

can you hear sound if you plug it in ARC HDMI Signal !

[Roncruz]

There is no sound only i hear is the relay clicks

[Diah]

There is no sound only i hear is the relay clicks

how it come ? yours LG response to remote or... so you can put it in standby and turn it on too at time the evdd socket unplugged from t-con.... please confirm

[Roncruz]

Yes i can turn it on via remote control with evdd unplugged. 3 blinks then 3 seconds shuts off. Then turn it back on same process, even the evdd socket connected. That is only the cycle that is why i can report the optical is lit. Im guessing it went to protect mode.

[Roncruz]

?

[Diah]

by LG no counts of LEDs at any test .. our sign optical lit on and remain on. forever Tv are On

[Roncruz]

I understand. In my case my tv shutting off and relay clicks at the second time.

[Diah]

I understand. In my case my tv shutting off and relay clicks at the second time.

the second relay Clicks are SOS Signal some where issued , need to know from where the issue come.
try first the lower LVDS cable only between MB and T-CON unplugged it ( the lower only not the top one.. other sockets should be in place ) turn on and check the optical if always on

[Roncruz]

Tried plugging in with out the second lower LVDS connected. It turns on with the same 2nd clicks and the optical is not always on.

[Diah]

Tried plugging in with out the second lower LVDS connected. It turns on with the same 2nd clicks and the optical is not always on.

in this case... need to take out the PSU on the table to test it standalone to see if it turn on and produce all need voltage..
if it does. then try unplug wifi / BT speaker to reduce load on MB. if the issue remain need to inspect the MB

edit: you need to have service remote to send power_only and in_stop in case there are issue at MB, some time MICOM SW play in wrong way

[Roncruz]

Okay thanks will check

[Roncruz]

I tried removing and unplugging the speakers and wifi still wont same issue, psu voltage is good and complete tried power only and send in stop nothing happened. I looked out after the mboard i saw underneath is quite black like its burnt? Ill send a photo