No signal message on TV

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CH76

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After trying to resolve a problem with Comcast on the loss of a channel, the HDMI cable hooked to the X1 box fell out. Since that time, my Sony TV has no signal. I have tried all the suggestions and gone through all the box and TV power off requests from Comcast and on my own. No change. I have had no tv picture since Tuesday but can stream from Netflix. This is a smart TV. I purchased a new HDMI cable but there is no change. I have seen all the messages about there being a problem with the HDMI signal getting out of sync. I don't know what else to try and Comcast has not gotten back to me as they said they would on Wednesday afternoon . I called Comcast again Thursday morning and went through all the power off and on checks but no picture. Any ideas on how to solve this problem would be appreciated. I can stream fine . I just can't watch TV channels.

"No signal message on TV," is about XFinity-Comcast Television.

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