Good day Mr.Daniel Navarro..
The picture below is the sample 42" plasma TV (internal parts)..
If your TV won't adjust volume or change channel by pressing button on the front panel..The problem could be the digital control board,it is the one that have a rectangular red on the image shown..
But before you replace the board make it sure that the control button assembly is properly connected on the said digital control board ( no loose connection or loose solder)..
Also try this remedy:
If you have remote control you can use it for the mean time to adjust the volume and channel so that you don't need to replace the digital control board..
Hope it helps..
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