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some sets have screws in the back all around the front cover and some come off by taking bottom speaker grill off first and you will see screws that holds the cover. And some have a template that pops off and screws are underneath it.
If the set is in fact new, return it for warranty service. If not, then you can swap the speakers inside the set to determine whether or not the speaker is the problem. If the speaker itself is OK, then the audio amp IC is defective. This should be a small part with 7-9 pins that may be attached to a heatsink. It should be marked TA8265.
They are available on the Internet---the part number for the speaker grill for a 57h83 Toshiba is :23527269 if you Google this number on the internet you will find a number of places that sell it; it has a suggested list price of about 152 dollars--if this was helpful please indicate by giving me a vote here.
The answer to your questions is yes. But you may also want to consider the age of your tv, whether it is analog or digital format etc. I only say that because it may be less expensive for you to purchase a different TV, used or new than have a technician install a new speaker for you. Many people are donating perfectly good tv's to the salvation army and other thrift shops because they want the new flat screens, the digital format, etc.
As far as I can tell, the part you need is called the speaker grille and is the entire piece, not just the cover. The part number is: 23527269 and costs: $152.29. It is available from tritronicsinc.com
sound is produced by so many components, but i will mention criticle ones. take your tv to w/shop
and let them check the following
speaker continuity resistance
capacitor coupling ( electrolitic) feeding a speaker
final amplifier IC
Vcc voltage feeding the IC
or a jack which seperates speaker and external sound. im positive it will work