Unfortunately, the most likely and common problem has happened; the main power supply has failed.It has probably been marginal for some time but certain components (electrolytic capacitors) don't live forever when used in circuits with fast signals present.
If the power supply is a separate assembly (very common), it is a matter of buying a replacement, removing the old one and installing the new. These are connected with plugs which are not easily interchanged so can be done by a smart layman.
The cost will be between $75 and $150 US for the supply, labor varies depending on area.
If the supply section is on a larger single board, it may be necessary to remove the entire board for repair.
If you can remove the back panel of the set, look for a smaller board with larger-than-average parts on it, There will be large and small cylindrical parts (capacitors) as well as fair-sized blocks (transformers and chokes).This is the section that has failed and should be available from the mfr.'s service center.
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