LG OLE65C1 Stand-By issue

[Titus6]

Hello everyone,

I bought an OLED65C1 refurbished TV back in 2022 from a shop. The TV is awesome, this is my first OLED and I really love it.

However I have an issue with the TV since the end of last year. I noticed when my TV is in Stand-By, sometimes the LED goes off then comes back on. When do so it seem periodical. It only goes away for 1-2 seconds, than comes back on. The TV NEVER turnes off, while it's on, so it's not overheating issue or electrical power issue.

I bought a service remote (MKJ39170828) and checked the menu 3. Power On/Off Status. I took a picture of the entries. Obviously the first entrie is me turning on the TV with the remote, the interesting part starts from the second row. I noticed that these entries are repeating through 150 lines. Tried to search on Google what's the meaning of these lines:
- OFF_BY_EDID_WRITE
- ON_BY_LAST_WARM
but I couldn't find anything useful.

Also I have external winchesters connected to the TV. Normally when I turn off the TV it turns off the USB ports in a few minutes. When the Stand-By LED goes off and comes back on it powers up the USB ports as well for like a minute and turns it off and it keeps repeating. Now I never leave the winchesters plugged in, I don't think it's good for them to keep turning the on and off.

On additional information: I hear a ticking like noise from the main boar around the HDMI connector at the rear side. When the Stand-by LED turns off the noise stops, then starts again. Also the noise dissapears when I turn the TV on.

According the information I gathered so far it can be either the Power board or the Main board what causes this. I could change it for myself if I would be certain which one should I change.

Did any of you had similar issue? Any advice for solution is very welcome.

Thanks in advance!

[Diah]

yours power boards serial no. if its at the end LGPXXXX -200P then read my post #3 at this Threat

[Diah]

yours power boards serial no. if its at the end LGPXXXX -200P then read my post #3 at this Threat

[Titus6]

Thank you for your answer. I have the exact same power board as in your Threat. Might worth a try to change the mentioned capacitors.

However my symptoms are different from yours. My LED just turns off for like 1-2 second then comes back on and it's keeps repeating it. I don't have to unplug it from the socket.

[Davi.p]

disconnect everything from hdmi and test.. eventually inspect inside hdmi ports or check their pins with continuity check for shorts

[Titus6]

Hello David,

Thanks for your reply. Today at 9:00AM I disconnected all the hdmi cabels and USB cabels from the outlets. Only thing stayed plugged in was the antenna cable. I did a turn on-off sequence with the remote so I can see them in the entries. So I arrived home at 13:00PM and check the Power On/Off Status menu. It's still doing the same thing in the background. In 4 hours 10 new entries in the Status Menu (picture attached). I don't even know if it's normal or is it has any interdependence with the Stand-By LED.

I will check for shorts in the HDMI ports, but shouldn't it be any affect for video or sound wise with the connected device if that would be the case?

[nomoresonys]

Wonder if you have a remote button sticking, is there another remote you can try or maybe clean the remote. Use a phone camera to see if the remote is constantly sending out the signal.

[Davi.p]

was the ethernet cable connected usually? It can happen.sometimes the spiike runs through the lan cable and destroys the miniature transformer near LAN.connector..

[Diah]

the fault which registered its SOS generated by MICOM. but you wrote at first post the Front LED disappear and come back ..

so you need to do following
1- disconnect PSU from all sockets VIN EVDD and to MB... just leave it with wall and monitor the STBY for long enough time if it stay stable , if not then change what i wrote before
2- if STBY stable delete the fault register... and turn the TV on with Power ONLY via yours service remote
3- disconnect only the lower LVDS between T-CON and MB and turn on normal... see if the optical port remain on... screen will stay black.

[Titus6]

nomoresonys:
I have two remotes the original and the service one. I checked the original remote with phone camera. Works as expected, no sticky buttons. There is no battery in the service remote when I don't use it, so it can't cause any unwanted interaction with the TV.

[Titus6]

Diah:
Thanks for your effort for sharing your knowledge.
I have a few questions:
1.: If i disconnect the MB from PSU, how can I check if the STBY stay stable? The STBY-LED get's its's power via the MB.
2.: Where can I delete the fault register?
3.: How can I check the state of optical port?

Thanks in advance!

[Diah]

Diah:
Thanks for your effort for sharing your knowledge.
I have a few questions:
1.: If i disconnect the MB from PSU, how can I check if the STBY stay stable? The STBY-LED get's its's power via the MB.
2.: Where can I delete the fault register?
3.: How can I check the state of optical port?

Thanks in advance!

1- just check the socket on PSU you will have VCC .. monitor it if its stable ( remain same value )
2- at same Menu with yours service RC
3- it will lit red color

[Titus6]

Sorry if I sound a bit silly and ask too much, I'm not a TV expert.

So about VCC where should I measure it exactly? On P201, P251 or P252 connections?

I have the pin explaining table for each connection and I only see:
On P201 connection: 20VS (20V), PWR_ON (3V), 12VM (12V), DRV_ON (above 2.5V)
On P251 connection: 8-15 pins: 22VD (22V)
On P252 connection: 7-12 pins: 12VT (12V)

I can't find the the menu to delete the fault register. If I press In-Start button I only have the menu which you can see on my first attached picture. Check all of the sub-menu but I couldn't find it.
You mentioned earlier the Power Only (P-only) button on the service RC. I pressed it but I saw the warning and didn't dare to proceed. If I go to that factory mode how will I be able to exit and go back to normal mode?

Also today I found another fault code in my Power On/Off Status: OFF_BY_ABN (picture attached)

[Diah]

LOL

sendwith yours Service RC IN_STOP follow it with 0 4 1 3.... tv will go to stand by.. plug it from wall 2 minute then plugg it in again this is Hard reset and will bring the TV at Factory shipping state

[Titus6]

Do you think it will solve the problem?

I found this document on the internet: https://research.encompass.com/ZEN/sm/OLED65C9PUA.pdf

I know it's not my TV type but on Page 32 I found this:

POWER_OFF_BY_ABN

Explanation:
Case1 : Pipe line overflow
Case2 : reboot to suspend Fail

Action contents:
Check & Change Main B/D

Do you think it worth the factory reset and might solve the problem?

[Diah]

In stop will never harm the TV... its useful to clear the error register.... reset MICOM firmware... reset Main Fimware, Reset Pixel refresh, reset T-CON firmware..

[Davi.p]

are there 8pin eproms near the hdmi connectors? or a small ic for each? them can be faulty..

[Titus6]

Diah

I had the time yesterday to do the Hard reset. I did the steps you mentioned above. After I finished the TV setup I checked with SR the In-Start menu again and I experienced the following.

1. The Power On/Off status wasn't cleared I still saw the list of OFF_BY_EDID_WRITE, ON_BY LAST_WARM entires.
2. The S/W Version stayed the same, didn't change
3. Micom Version stayed the same, didn't change
4. Boot Version stayed the same, didn't change
5. Only thing changed is the UTT obviously, so now the total usage time reseted to 0.

I'm affraid I didn't have other choice than change the Main Board, unless you have other idea.

Davi.p:
How can I check, if these components are faulty or not?

Thank you guys.

[Davi.p]

It would be a start if you answer my questions..

[Titus6]

You got the point. In the following day I disassemble it again (need to do it anyway because I need the exact part number of the main board), and I will take pictures of the main board and the HDMI port area.

I'll be back as soon as I have the pictures.

Also answering your previous question yes, the LAN cable is alwayas connected. However as I read on the Wikipedia "EDID (Extended Display Identification Data) are metadata formats for display devices to describe their capabilities to a video source." So I guess the fault is somewhere around the HDMI ports.

[Davi.p]

Yes EDiD data are associated to hdmi and stored in some eproms near the connector, sometimes are integrated in other chips, but the LAN input can carry high current spike with arcs to surrounding components..

my curiosity to other users: am i the only one with the obligation of entering a Captcha code every post i put?