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Default Distorted soubnd on LG Smart TV 42LW5500-ZE

Good morning

I own a LG 42LW5500-ZE Smart TV about ten years old. It worked OK until
about two weeks ago, when the sound quality started to degrade and has
worsened from day to day. It sounds as a mix of saturation, crossover
distortion, box resonation and loudspeaker cone broken. I will open the
set this weekend, but before I would like to know if anybody has any
experience with this.

The sound make me remember class AB discrete amplifiers, when the bias
was not properly adjusted and the transition of one leg to the other was
not smooth, but the TV amplifier looks a class D one (NTP-7400L).


Miguel Giménez