You must go on fromthe point you left off, trace the +B to the circuits, check the microcontroller, the sub processors, confg of the ic's can be got from manufacturer's site. Probe only if your are familiar with these sensitive circuit, have a rough idea of the LCD TV circuit. Look out for any fusible resistors to the main board replace or ceck PD across, if showing low ther could be failure of PCB ....you may be infor an expensive work... Hope this helps
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