My apologies for asking a question to enter a lcd fix for my canon mp220 printer as I couldn't find how to post my help fix. Pop off carefully the bezel around the buttons panel. Remove the small philip's screws to lift out the control panel. Flip over and remove the dome headed philip's screws and separate the button carrier from pcb. Carefully unclip the lcd carrier from the pcb. Ensure no shorting tools near the pcb and turn on the printer. The display ribbon cable socket on the pcb needs to be sqeezed between thumb and forefinger as my connector had eased with age. BINGO screen now OK. This fix worked for me. Best of luck all you other Fixers out there.
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