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Yes ,you should replace the main board ,because you can'nt repair HDMI interface.
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Be sure any device with HDCP (high bandwidth control protection) may disable your HDMI input. You may have to figure out how to reset your HDMI or you may have to consult you device manual how to reset the HDCP.
If you cannot select a HDMI input then it is not sensing that a HDMI signal is present. Be sure the HDMI cable is not bad and the source is working. If it is then you would probably need a Signal Board. To be sure, a Sony Service facility should check it out. Sony Customer Service Number is 1800-222-SONY.
Hope this helps
Skyassoc
JUNH-THE HDMI CONNECTIONS ARE VERY FRAGILE I'D RECOMMEND SUPPORTING THEM ANY WAY YOU CAN.THE HDMI INPUT ON TV IS POSSIBLY DAMAGED BY NOW AND MAY NEED REPLACING.JOE TV
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