intermittent Latest software update broke HDMI on my LG OLED G2?

[OliverRC]

Up until a few days ago my TV and AVR have been working perfectly since I bought it.
Zero hassles with HDMI and connectivity.

Then I was prompted to update to the latest software version which I did and now often when I switch HDMI (running on 1) it picks up the device name, CEC works but I get “No Signal”… and then nothing.
Just stays on “No Signal”. It is almost as if some HDMI handshake breaks and now the driver is in a broken state.

I’ve found that if I hard power off and power on the device sometimes works but I don’t want to do that every time especially since it’s hard to get to the power.
This really strikes me as a software issue with the latest update as absolutely nothing else has changed in my setup.

I’ve tried:

• Different HDMI cables (high quality)
• Deep colour settings
• Reset the TV to factory default
• Different HDMI ports

TV

• Model: OLED65G26LA / OLED65G26LA.HFBQLWK
• WebOS TV Version: 8.3.0.2301
• Software Version: 13.30.56

AVR & Devices

• Marantz SR5015
• Nvidia Shield Pro
• PS5
   

The setup is the conventional AVR installation as shown in the attached file

 

Has anyone else experienced this? 

Is it possible to revert the software update?

[Djj]

I have experienced the same issue with Denon AVR3400H.  I’ve seen other posts along this line and hope there is a patch by LG to remediate!   It’s a large inconvenience as base LG oled sound is not terrific.

[WD4512]

I just posted about this very topic. Have you found a solution? TV keeps saying no signal no matter which port used (trying to connect our cable box) diagnostic says faulty hdmi cord to ALL that we’ve tried. Makes no sense. And yes this happened after update.

[OliverRC]

Hey, for some reason I haven't experienced the issue very much after posting it. If it does happen the only solution that seems to work for me is to hard power off the devices (i.e. turn them off at the wall) and then turn them on again.

I am not sure if they ALL need to be powered off, you can start with just doing the TV but mine are all on 1 plug so they all go off an on when I cycle the power.

[rodneuson]

Hello everyone,

I'm brand new here, so please forgive me if I make any mistakes.

I'm experiencing exactly the same issue with my LG G2, connected via HDMI 2 to a Sony STR-DH790.

This problem first appeared about six months ago, initially occurring only 2-3 times every couple of weeks. Unfortunately, it has progressively worsened, and in recent weeks, it has become constant, lasting uninterrupted for at least five minutes if left unresolved.

Last month, LG kindly replaced my TV's mainboard for free despite the warranty being expired by six months, but sadly, the issue persists. Initially, I suspected the receiver might be at fault. However, after extensive research last night, I discovered this forum and thread. It now seems likely that one of LG's updates released last year may have introduced a handshake problem.

Here's what I've tried so far:

• Disconnected all devices from the TV except the receiver.

• Disabled eARC, Passthrough, and all advanced audio output settings on the TV.

• Disabled eARC on the receiver.

• Turned off the receiver, disconnected it from power for 30 minutes, then reconnected and powered it back on.

• Turned off both receiver and TV, disconnected both from power for 30 minutes, then reconnected and powered them back on.

• Completely disconnected all cables and wires from the receiver and TV, powered them off, then reconnected and powered them back on.

• Tested with multiple different HDMI cables.

I have tried every possible combination of these solutions without success.

Attached are three videos demonstrating the issue, as well as a simple schematic of my setup.

I'm hoping someone here might have a solution, or at least confirm if LG is aware of the issue and working on a fix.

Thank you very much for your time. Have a great day!

[rodneuson]

I hope I don't jinx myself by sharing this, but my goal is to help others facing similar issues, saving them the frustration I've experienced — especially considering how much we invest in these devices.

After deciding to purchase another HDMI cable to test if a different brand could resolve the issue, I performed another power cycle test, this time slightly differently from before:

1. Turned off the TV, receiver, and subwoofer (though turning off the last one might seem unnecessary, I'll explain why shortly).

2. Unplugged all three from their power outlets.

3. Removed ALL HDMI cables from the TV — no exceptions.

4. Removed ALL HDMI cables from the receiver — again, no exceptions.

5. Waited 30 minutes (although it was closer to 40-45 minutes, as I took some extra time before actually start to count time).

6. Plugged the TV, receiver, and subwoofer back into their power outlets.

7. BEFORE turning anything back on, reconnected all HDMI cables to the TV first, and then the receiver.

8. Turned on the TV.

9. Turned on the subwoofer.

10. Turned on the receiver.

11. Went to the TV settings and switched audio output to HDMI.

 

Now, regarding the subwoofer: since the goal of the power cycle is (as I understand it) to completely clear any residual electricity from the devices, I concluded that the subwoofer might also have an influence.

The subwoofer in my setup is active, meaning it requires its own power source. Additionally, the connection between the subwoofer and the receiver involves electrical signals, as with any speaker. Testing it this way made sense to me.

 

After all this effort, surprise, surprise...

The problem persisted — and initially seemed worse, with the connection between the TV and receiver repeatedly dropping, causing rapid flickering between the "No Signal" message and the TV's volume meter popping up constantly.
At that point, I was ready to give up (again). Out of frustration, I stood there watching the screen furiously flicker.

Then, after a few intense seconds, the flickering suddenly stopped. The TV started displaying images correctly, and the receiver's front panel showed "DSUR", confirming that the handshake went well.

This occurred two days ago. Since then, I've experienced no more flickering, no random "No Signal" messages, and no frustrating audio dropouts.
My previous frustration (extreme annoyance actually) and hopelessness regarding LG's willingness to investigate the issue have finally eased.

 

I genuinely hope this helps anyone else experiencing similar issues. And if someone from LG is reading this, please consider such concerns seriously — even if issues appear extremely isolated.

 

Thanks for your time. Take care, stay safe, drink water, and hug someone next to you. See ya!  

 

[td47]

I cannot believe that since eARC was released in 2017, 8 years later we are STILL seeing posts like this. The standards have been in place long enough to get the TV and AVR companies to get their collective heads together, and ensure that their firmware (and HDMI Chip-sets) work seamlessly together, and that design AND coding standards are FULLY adhered to.

I would also have thought that 8 years is enough time to iron out any timing and race conditions in the firmware. 

Any hassles like these only serve to deter customers from buying any TV and AVR products that do not work well.

I have seen other posts about firmware updates actually CAUSING issues like this, rather than properly fixing bugs. Not just LG of course, but you would think that the bigger players would put more effort into testing with more varied configurations before releasing new firmware.  It cannot be a profit excuse, as LG made KRW 3.42 Trillion (about 2.5T USD) in 2024!