Hello! I would like to repair my father's Sony Bravia KDL-40v4100 LCD TV. It was in perfect working order the last time I used it before the pandemic. Then it sat plugged in but unused for a year or more. And now everything still works except that there is no picture on the screen. A relay can be heard to click when the power cable is connected. When the power button is pressed there is a green power LED and then the backlight turns on. If I connect an HDMI cable and play something with audio I can hear it through the speakers. The remote control buttons are recognized. There is just never anything...

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Hello, I'm a software developer who occasionally finds a need to repair hardware, so here I am!