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This issue is actually caused by my cable box. Access the audio SETTINGS on Hand held Cable Remote, and turn on the HDMI and or "Digital Audio Out" option. found on 'more' settings list. This should fix the issue. I had assumed the Cable companeis 'Boot' would have installed this feature during its initialization.
I used 0178 to program my universal remote. You can also try 10056, 10178,10864,10885,11756,10056,11758, and 11499. Then you can try by dropping the "1" from the front of these codes.
Most good remotes have a programming function if this does not work, where the remote will "learn" the proper code. The actual button remote codes are as follows: 0 00117 1 00121 2 00119 3 00123 4 00116 5 00120 6 00118 7 00122 8 00245 9 00249 Vol + 00183 Vol - 00187 Mute 00057 Channel + 00181 Channel - 00185 Power 00053 Enter 00164 Last 00247 Menu 00171 Guide 00244 Up 00168 Down 00166 Left 00170 Right 00037 OK 00164 Sleep 00054 PIP 00197 Info 00251 PIP Swap 00198 PIP Mode 00199 Exit 00216 Audio 00059 Input 00090 Wide 00138 TV 00110 AV 00105 Component 00231 HDMI 00174 MTS 00055 CC 00025 Zoom + 00165 Zoom - 00169 Freeze 00200 RGB 00253 PIP Ch + 00196 PIP Ch - 00203 PIP Input 00199 PIP Size 00201
This sounds as if it could be a ballast problem, or a switching power supply transformer problem. Both of these can produce this sound. I would suggest that you have a qualified TV technician repair this set due to the dangerous voltages and currents that could be present. In my experience with these TV I would have the technician pay special attention to the power supply board and the backlight/inverter section which includes the ballast used to fire the backlight.
I would suggest checking the driver circuitry for the LCD screen and I would also check the connectors from the driver board to the LCD. Either a component has begun to malfunction (hence the excessive heat) or the component has becom thermally sensitive and is reacting to existing heat and is allowwing excessive current to pass causing more heat to be generated. In any event have a qualified TV technician look at this problem because he will have the proper equipment to troubleshoot the TV in the proper fashion.
Some models of the TV have PIP as an option, but not installed, and to make it cheaper, they use the same remote and menus, just disable the option, as it's not supported. Best to check the Manufacturer's website to make sure that it does do PIP, not that a related model which has the same user manual does PIP.