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there is an electronic problem inside the tv you shoud go to an authorized service because the power supply to this tv it is in protect mode somehthing hapened inside and need to be repair
You have a cracked panel and the gasses inside have escaped. The buzzing noize you are hearing the the current flowing throught the panel. It will be cheaper buying a new TV than buying a replacement panel. But if u wanna check out the price look up your model on parts.com
If your lucky the degausser ckt will fix your rainbow in a few days. When the set is cold and on power up, the degausser works before the picture comes up(hum noise). Worst case, the shadow mask is messed up and it will never be right.
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