Look at the venting grills to see if you can see any white lights inside, if not, the problem can be in the backlight inverter board or it is not getting power from the main power supply.
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Popular Solutions for Philips Magnavox 42MF521D/37
Every time I turn on my tv, there is a red line vertically down the middle of the screen. It stays...
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Every time I turn on my tv, there is a red line vertically down the middle of the screen. It stays for several minutes and then disappears, but its there every time I turn it on. What is causing this?