I have Pansat 4500 and it does A very good job scanning but it does freeze if it stoops on some HD channels and you have to remove coax to get it off of channel.
You may not have hurt the lnb but it is possible. If you have any diseqc switches in your setup it's more likely to have damaged the switch. Was your dish working with any other receiver, I take it you have this 4500 since you posted here?
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