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Hello, To open the TV you must remove every single screw on the back of the set- including all of the ones in between the AV jacks. The base stand must also be removed in order to remove the back. Then the rear cover will come off.
The AV jacks are the audio video jacks- where you plug in cables from the external audio video sources. Sometimes there are screws on the outside of the HDMI jacks and the AC power jack.
Also, the symptoms you have could be caused by the power board (most common) the mainboard or the LCD panel itself. There's no way to tell for sure without using a multi-meter to test voltages inside of the set.
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