Do you get the welcome (Coby) screen when you first turn on? If not then it may be the brightness or contrast needs turning up. Or even the backlight is burnt out, as basically it's a bulb behind the dislpay screen.
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Popular Solutions for Coby TF-DVD7005 Portable DVD
screen went dark, tv made a humming noise, then a burning smell came out of it. Now it doesn't work...
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screen went dark, tv made a humming noise, then a burning smell came out of it. Now it doesn't work at all. Any advice? Is there a way to get the dvd that is in there right now out?