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Search the internet a little more an you will find information about an IC chip mounted in a socket that often causes this problem. The socket itself will develop poor connection to the IC pins. They recommend removing the socket and soldering the IC directly to the board. Definitely not something to do unless you are very experienced with desoldering. An alternative may be to try and reseat the IC in it's socket while using contact cleaner.


These intermittent connections can also corrupt the information stored in the memory and may require a hard reset. Hold the A=B key on power up to clear any corrupt data. As I recall there are also two locations in this radio that require 3 volt lithium batteries. When they start going bad it can cause the display to do strange things.