These "export radios have two audio chips. one for receive and one for transmit. Did you look at the s meter to see if it wasnt receving at all or you just didnt have rx audio?
Some CB Radios require the mic works right or the receive won't work. Also it could be a detector diode bad. I have also found cold solder joints ( broken lead from the PC Board ) around the if sections. You might take alook with a magnifing glass and see if you can see any bad joints. Good Luck
Ed
NC Electronic
Mills, Wyoming
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