Ssb board I have a 55' philips that turns off after 10-15 minutes. I was told I need an SSB Board from a 27' Philips. I can't seem to find that part anywhere. Any suggestions?

Ssb board? This trouble maybe power supply or inverter boards is defective.
first you can test the voltage of the multr,and then check which part is defective.From Wisiny.com can find those parts
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1942LGR3P 715G1813 1 Philips ADTV1942LGR3P Power Supply Backlight Inverter

What model is this? Because it says Magnavox 27ms343s which is a 27' tv. The 55' has a different board. Small Signal Board is SSB, you also have a LSB. Your best bet is to call 1-800-844-7871 which is PTS and give them the model # and order the board. It will be the cheapest you can find. If that person is right then you can get the board here. And even if you have question you can ask to speak to a tech and give them the problem. Hope this helps