Sound issues can be simple (settings) or complex (burnt speakers). Diagnosis starts from sound settings in the menu before any technical repair.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing No sound from TV — ranked from most to least common.
Mute enabled or volume at 0
Audio output set to Bluetooth or HDMI ARC
Internal speakers burnt
Bad audio output IC on main board
Wrong app sound settings
Loose internal speaker cables
HDCP audio issue at source
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.