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Sounds like main power regulator board [SMPS] fault. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Ok first lets start with the half screen and no lit screen . Samsung plasma panels (S42AX-YD01) HD V4. are really bad about the Y-board (upper,lower) buffers are really bad about getting hot and burining up. If u remove the back cover of TV u will see on the left side the Y-board (it will be marked in small letters) if u look and the rows of IC's with heatsinks on the buffers will be a dark yellow. Majority of the time if u remove the buffers. and look underneath them u will see the solder has melted from the board. U can replace the Y-board and buffers and the TV will work fine.
Next part if u have vertical lines in the panel. There is not much u can do as a repair. Only thing u can do is get panel replaced. because there is and IC that is burned up on the panel, and trust me there isn't anything u can do to fix it. If u want to see for yourself. After removing the back cover, remove SSB, and brackets holding PDP in place. at the bottom of TV there is a row of buffers marked E,F,G, ( i think) there is a long heat sink covering the IC's at the bottom connected to the bottom of PDP. As u can see without a $70k machine to change this there is not much u can do with it. Hope this helps.
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