This is most likely going to be a color wheel. I would recommend checking on the color wheel first. If this is a dlp tv it could also be a lamp that went out.
SOURCE: Sanyo lcd 32" vizion integrated hdtv
im a tv repair guy in lex, ky in i fixed mine it had the sam problem it was bad inverter board go to www.shopjimmy.com and get it there good people and it will fix it. the backlight will light for a split sec and go back out its the inverter board trust me
SOURCE: Sanyo Vizon 42' Plasma TV has lost its picture after 2 years
the bulb of your tv is dead. replace it
SOURCE: screen went black on my 42" sanyo model dp42647 lcd
Hi there! The panel may be in protection mode. The Inverter board is the most logical area to start after checking power supply Voltages.(5,6,24 and 13Volts). There may be coils on the Inverter Board which have bad soldering or faulty. Other than this it may be main board which controls switch on or off. If all else fails, refer to a repairer. Beware of High Current!!! Best Wishes and Good Luck, Jus004
SOURCE: my sanyo 42 plasma screen just went black..can hear it but
Ur Tuner Signal board it dead,must replaced this board.
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