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do you still have a complete picture ?,are the lines coloured,?
do the lines go from left to right or do they spread out from the blank spot in a circular direction like the suns rays?
from your description above i am sure you are describing a broken lcd screen,if i am right there is no repair feasible for this set..
There should be a button on your TV remote that will be called "Display" or "P in P".
The display button usually displays which input you have selected, such as: SAT for Satellite; AV1, AV2, AV3 or AV4 - depending on how many inputs your TV has, to plug in devices like a VCR or DVD recorder/player.
Otherwise, if you have a more sophisticated TV, it could be that you have accidentally pressed the "P in P" button, that selects the Picture in Picture mode. If you have done this, your TV will display the main picture of the input you have selected, plus another input, (such as SAT or AV1 or AV2 etc. as I've mentioned above). If the AV1 or AV2, etc. input is not active (not switched on) then that input will only display a blank (black) picture in the top left corner of the screen.
Hope this helps...
This is a fault i have seen with phillips lcd tv's and i suspect it could be the lcd screen itself,the ribbon cables from the screen are heat contacted on to a circuit board and there could be anything from 10 to 15 of these ribon cables and over a period of time the heat generated from the internal panels will deteriorate the plastic ribbon cables.
Try twisting the screen gently by placing your left hand on the top left hand corner and your right hand on the top right hand corner and gently twisting,if the lines go and then come back after you let go then a new screen will be required but it may be cheaper to buy a new one,could be worth buying the extended warrenty.