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Some of the older Mitsubishi with HD 1080 have only one component input for HD---it is marked on rear as DTV----also a model number may allow me to give another suggestion--Some of these sets (ws, wt, vs models) will on occasion lock out or disable the input/s.
Depending on model number most also have 3 hidden menus---one is the option menu----it allows with the Mitsubishi remote via a 4 digit number (by model number) to enter there and do a hard reset of the set----sets every setting back to factory original---seen it "cure" all kinds of odd problems from missing rear inputs, no sound, odd video issues---you name it.
Get me the model number and I will see if can find the code for yours--you can also try hooking first direct a 1080 blue ray or Dvd if you want to see if the input is active or not first.
Resistor no R5A73 is a carbon film 10K ohm 1/4 watt 5% resistor. I would suggest getting the service manual as it will break down the xray protection circuit and make it easier to find the problem. You can get one emailed to you at the following link I am one of there support techs and they provide unlimitted free tech support for anyone that purchases a service manual