The main display shows nothing. No audio. Pretty much meter and sub display lights. Sub display shows small rectangle shapes. NNNNNNNNNNN
NNNNNNNNNNN
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Hello! Just to clarify: when you say "display shows nothing", does it possibly mean it shows "dots"? Or just totally blank? Dots would mean PLL unlock, which would give you no audio, no transmit. The rectangles on the subdisplay might indicate that the subdisplay needs a "reset", or even battery replacement. Perhaps even same for digital board battery(?).
Just thinking of my own 940 fun times I've had.
Good luck. Wishing you the best.
73,
Francis WA4ZYN