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Krash01

LG UHD TV digital sound out popping noise problem

Question

Dear Readers,

I've a strange issue that I've been struggling for a week. I bought an LG43UJ634V UHD TV and an LG LHB645N Home Theater in a Box system.
I use HDMI ARC to connect the audio from the TV to receiver. LG has an option to chose between PCM or Auto at the Digital output settings.

If I use the PCM option everything sounds great, but I don't have 5.1, only 2.1.
And here comes the problem. When I choose Auto, 5.1 is on, sounds great but I have occasional popping noise (like when play something on an old LP player) it happens random, but for example during a film, it is very annoying. It happens with YouTube, Netflix, DLNA streaming, external devices, so the content doesn't matter. I think I've tried everything. I tested it with different HDMI cables, optical cable, but still have the problem. I tested it with a sound bar as well, the problem is the same.
When I play content from the receiver, there is no problem, the sound is wonderful, no popping. Also, the TVs speakers are okay.

I don't think it is a hardware issue, because the TV's sound is OK, the home theater's sound is OK, the problem only happens when I want to use the digital output of the TV (either HDMI ARC or Optical) with auto setting.
I called LG as well, the rep. said the she will pass this info to the technical team.

Do you have any idea, that it can be solved, or I need to wait for a software update?

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Having the same issue with a 55" C9. Random pops from the optical out make it pretty much unusable. Disappointing from such an otherwise impressive television.

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I had this problem as well. Come to find out that my high speed internet was sluggish. I rebooted my router and the popping noise went away. If this is only happening with streaming apps or internet apps, you may want to consider your internet speed.

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