After taking the screws out and removing the back, you will see a power supply(where master switch and cord connector are). Remove the 4 screws on the aluminum cover plate to gain access to the fuse. Using a voltmeter, with the power on and switch on, measure the voltage on each side of the round fuse located just behind the cord connector. If voltage is 0, fuse is good. If voltage between 115 and 125 V, replace fuse or have fuse replaced. I think it is a 6.3Ah 250V class fuse that is soldered into the board. IF YOU ARE NOT FAMILIAR WITH SOLDERING TECHNIQUES AND PRECAUTIONS, DO NOT ATTEMPT TO DO THIS. IF YOU ARE NOT FULLY AWARE OF ALL SAFETY PRECAUTIONS NECESSARY TO MAKE THIS REPAIR HAVE A QUALIFIED TECHNICIAN DO IT FOR YOU!!!!!!
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I had the same problem with the exact same TV. I took it to a local TV shop. My problem was fixed by replacing the T-Con controller board. The cost of the part was about $85 and labor $125. There are no "new" parts out there for Olevias because the company is out of business but I did find a part pulled from a "damaged in transit" TV. It's a personal decision (assuming the parts can be found) as to if its cost effective to repair the TV.
Does the hum go away when you mute or turn down the sound completely? If it does then the issue might be one of the sources connected to it IE: DVD, Cable Box, Satellitereceiver..
LCD TV backlights, which are not user-serviceable, are a special CCFL (cold-cathode fluorrescent lamps) that is a model-specific repair part from the manufacturer. A LCD panel typically has multiple CCFL tubes, and it depends on the size of the screen.
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