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V1040 screen freeze on power up

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I'm having some intermittent problems with a V 1040.  When I power up , The touch screen will often just  not work.

I've checked the SB 8 bit online and it doesn't respond to a touch. The battery is new and shows status as good.

I can  access and control online through remote operator even when the screen is completely frozen. This is been happening intermittently for a boat two months now and I cannot find a solution

. Any suggestions would greatly help

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Perhaps  Vibration or shock has loosened the connection for the touch screen ribbon cable in the motherboard connector.

Open the back of the unit and check .  Flat ribbon cable  4 contacts   wide along the side of the motherboard.

Unitronics does not recommend opening the units -- but .....





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