You may want to check the voltage on the IF input to confirm your receiver is not damaged........here's how..

You can measure the voltage coming out of the tuner "F" connector quite simply by disconnecting the LNB cable and pushing a bare wire into the tuner connector. Now set your voltmeter to 20 volts dc, put the red probe on the bare wire and the black probe on the screw thread of the connector. With vertical polarisation selected you the meter should indicate from 13 to 14 volts. With horizontal selected, the meter should indicate 17 to 18 volts. However, this measurement is not necessarily correct because the LNB is not connected and there is "no load"! But, it is a good place to start.

Most accurate method....and u can see what channels and polarization the receiver is set to by viewing "info" on the tv screen.
To measure the voltage "under load" you might be able to remove the side or top of the receiver and touch the red probe directly onto the "F" connector center pin and the black probe on the screw thread of the connector. USE caution as this is often difficult or dangerous (main 120 voltage nearby!) BE CAREFUL!