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On your remote search for a "Menu" option. Press it and it will show you some options on the TV screen. look for "Video" or "Picture", go to it with the 4 way directional keys on the remote and press the enter (center key in the cross directional key group). Go to "Brightness and Contrast" and increase the brightness.
Look on remote to see if there is one button labeled "mute." If so push that when tv is on and see if that fixes sound. Or find volume buttons on tv and hold down button that is for increasing sound, should show a scale on screen with volume increasing.
Try website like Remotes.com to buy the original remote it ur best bet.Tries the manual control on the tv.Push the Menu button use the channel + - and the volume + - on the manual buttons to adjust colors,contrast,brightness.
I found these remotes control VCR's only when programmed into the DVD button. It even says on page one of the manual that the DVD button is for DVD's, TV/VCR's, VCR's, etc. I got code 607 to control my GE VCR (using the DVD button). If that doesn't work, try 572 647 563 609 644 645 or 531.
I believe you have a regulation problem ,when you increase the volume the audio output IC draws more current therefore the power supply has to keep up with the increase in current,the symptom might happen if you increase the brighness to the max as well,the voltage changes need to be monitored closely to diagnose what component is not doing the work.If you are familiar with tv service this is a problem that will give you a challenge but if you are not too familiar be safe and let someone else get the headache.Let us know how it goes or if you need more information.