I have this issue...my toothbrush io 9 display has stoped working but everything else working fine....i open it an and found water inside...this could burn the display? can it be fixed?
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In my case, the battery leaked and damaged the circuit board. I had to repair one of the traces because it was corroded, and the display is working again. I also protected the board with electronics varnish. I replaced the battery and glued the damaged seal around the toothbrush neck.
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