Rca lcd hdmi only

[VINTAGE.FAN]

A few years ago I was given a Rca 32" lcd that had been hit by a power surge, possiblg lightning. The set powers on, has all menu funcionality, and still shows a great picture, but through HDMI only. All the analoge inputs including the tuner, display "no signal" on the screen. The main board and power supply both look great, no burns or bad caps. Does anyone have any ideas, aside from a new main board, that could get this thing going again?