No picture
If it is a LCD, then the LCD panel is bad. If you are getting sound, it usually means the power supply and main boards are good but the LCD panel is defective.
If it is a PLASMA, it could be a number of boards ranging form the y-sus, z-sus(x-sus), y-drives... You need to check the voltages with a Digital Multimeter to determine what is wrong with a PLASMA that has sound and no picture.
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