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Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
So many possible reasons from part failure to faulty connections inside.
I would imagine it has OSDisplays so are they there and working OK.
My only thought other than a service engineer would be to turn it fully off overnight then try again but I would think its an age related problem (heat causes bad connections or part failure)
To make sure that the external speaker is good or deffective try to use others speaker.If the other speaker work it means that your speaker is deffective and if the other speaker not work it means that the problem is the sound output amplifier or driver of the TV.You need to check the inner part othe TV.The board of the TV inside at the sound section, just fallow the speaker wire to the board,that is the sound section.Check if theres a loose connection.
Sounds like you need go this site, enter codes and re callibrate your TV to the settings.
If this does not work - then sounds like you need tv repair man replace caps or solder bad joint.
Miyan sung, former philips rep man, Korea.