i have a zanon lcd56 (5, inch) with the duntk2547tpzz chip in it, but i have a problem. i bought it on the internet and the previous owner soldered a composite on it. When i connect my 12 Volt DC power adapter to it (i tried with an adapter with 0,5 A and with 1 A) it does nothing. Is it possible that the previous owner hooked the cables up in a wrong way?