Blue screen sound no pic

Hooked up to cable box Coax. Got a crappy pic. color off dark ect. then no pic. rebooted all finally got a pic. left tv on three hours fine. Turned off 2 hours later back on. Blue screen goes black 2 sec. blue screen sound no pic. When the tv is cold no pic. as It warms up I get a picture

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Hi,

Have you got different connection options from cable box, e.g. Composite, Component, HDMI etc?

Can you try the cable box with a different TV to prove whether the problem is the TV or the box when using Co-Ax?

What is the make and model number of the cable box?

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