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Hello, the grey screen could be due to a missing 220Volt source which feeds the color (RBG cathodes)inside the CRT(picture tube). When this happens the beam current inside the CRT goes high in a matter of second, thus triggering the beam current protection circuit(blinking green light)shutting down the TV. Repairing the secondary voltage source is necessary to get the TV working normal, a good technician should be able to repair it for between 80 to 100 dollars parts included, except a picture tube, which could be also the cause of the problem(K-A shorts).
I ouldn't find any good news on the web about this,
so i did a bit of research and discovered that it wouldn't cost me much more than the cost of repair if I went to Best Buy and bought a new HD-TV.
Wow ! The prices have really come down !
Now I'm glad that it malfunctioned !
That sounds like a power supply Issue, Unless you have the full service INfo and proper equipment its best to call a repair tech for your model as an isolation transformer is needed to saefly diagnose the power supplies.