Marine Electronics Questions? Ask a Technician for Answers ASAP
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One side of the screen being blank is not normal in any way; something in the system is probably 'broken' (-it might be the mounting, see below). But what to do and what to check on, depends upon the maker and model # ***** the device with said screen - please let me know.
If the sonar transponder has come a little loose in its mountings, that might cause the problem... and if the sonar transponder has suffered from a recent collision or grounding of the vessel, that might also have caused this problem.
Is your sonar transponder a through-hull type, or an in-hull type? Have you checked whether it is loose in its mounting or that the mounting might be defective otherwise ?