Hi Raven
Is this a Question?
or are you just telling us that the volume won't go up?
Modern TV's are digital computers
So, the volume buttons don't actually turn up & down like in the past.
The internal computer gets up/down values from a register. Then it performs the change to the Amplifier.
SO... the point is
A technician needs to look at it unless you are technically inclined to check the power supply for say "Bulging Electrolytic Capacitors".
Good Luck
How to Replace an Electrolytic Capacitor
Switched mode power supply
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