BeoVision Harmony 77 – LG C9 to G5/G6 Upgrade?

[Erich Hügli]

Hello everyone,

I own a BeoVision Harmony 77″ from 2019, currently fitted with the original LG OLED77C9.

I’m considering upgrading the screen to a newer LG OLED77 G5 (2025) or LG OLED77 G6 (2026) while keeping the existing Harmony sound centre, speaker mechanism and stand.

From my research, I understand that the original C9 screen mounting interface (B&O part 1711201) is different from the mounting interface required for newer LG G-series panels.

The B&O mounting adapter 1712601, reportedly compatible with the 77″ G2/G3/G4/G5, seems to cost around €500, which is quite expensive for a mounting bracket.

My questions:

1. Has anyone successfully upgraded an original 2019 Harmony 77″ from the LG C9 to a newer G-series OLED (G3, G4, G5 or G6)?
2. Is it possible to modify or reuse the existing C9 mounting bracket instead of replacing the complete mounting interface?
3. Does STB Brackets already offer an upgrade adapter for the Harmony, similar to their Eclipse upgrade solutions?
4. Does anyone know a more affordable source for the original B&O adapter 1712601, possibly second-hand?
5. Are there any software compatibility issues, LG setup changes or limitations with the Harmony motorised mechanism after upgrading?

Photos, installation instructions, part numbers and real-world experiences would be greatly appreciated.

It would be interesting to find a practical and affordable upgrade solution for owners of the original Harmony, especially since the sound centre and mechanical system are still excellent.

Thanks in advance for your help!

Location: Switzerland

Favourite Product: Beovision Harmony, Beolab 18

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