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my LG OPTIMUS TP509BK WAS BRICKED. BUT I FIXED IT - xda-developers
Remove the battery for about 10 seconds and insert it again. Try to boot your phone. If it doesn't work, then try to boot into recovery mode (Vol- + Home + Power; 10 seconds). If this doesn't work, the last chance to repair is emergency mode (Vol+ + Back + Power; 3 seconds). And if this doesn't work, then it's a full brick and you must bring it to LG center or change the mainboard yourself.