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Panasonic Tx-21jt2p tv horizontal resolution problem

GOOD MORNING/AFTERNOON/EVENING 
I HAVE A PROBLEM WITH RESOLUTION ON A TV PANASONIC TX-21JT2P/B CHASSIS Z-M3L
I CAN'T REDIMENSION ON HORIZONTAL. THE IMAGE IS VERY LARGE ON LATERALS. IT CAN'T BE CHANGED IN SERVICE MODE?