a/c trouble please help

I drive a 1992 chevy 3/4 ton,a/c stopped working ,took it to a shop and technician said he could not fix o determined problem because the high
pressure sensor was not getting power (mounted on a/c dryer o condenser in form of a aluminium cilinder) told by others that migght be the control panel,also the ""ac"" icon flashes on panel. please any sugestions????
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