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March 2012. This is late coming but at least it is an easy work-around for those whose Dell 3000TV comes on with sound but no picture.
Do the following: 1) turn the set OFF
2) Blow hot air down into the vent slots on the top right side . Do this for about 10 seconds with the hair drying on high.
3) Turn the set ON and enjoy!
Whether the backlights ( CCFL tubes) will ignite is mainly a function of age, inverter voltage, and temperature.
I found that my TV would not come on with video at or below 69 degrees F as measured with a temperaure probe inserted in the cavity a few inches above the slave inverter on the right hand side as you face the set.
At 70 degrees it would turn on properly about 50% of the time
At 72 degrees or warmer it turns on properly 100% of the time.
In lieu of using the hair dryer , I am thinking of installing a 2 or 3 watt heater (Yes, 3 little watts) inside the case just above the slave inverter to see if this will maintain the temperature in there a few degrees above our room temp of 68 degs. FYI the temp inside the case rises to and setlles at about 122 deg F after a couple hours of viewing time.
I have had the same issue for years...just hold the power button on for several seconds at a time. If it does not power up turn off and repeat. It may take a few tries but eventually it will turn on.