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This is all very odd. Is the mount in visual mode?...won't guide in visual.
Battery is only there for +3V "backup" for SRAM and RTC. Once +12V applied, the PCB makes +5V (actually +5.4V) and this then supplies the system and SRAM & RTC via steering diodes.
So you can take the battery out when powered on. Or power on without it...you will have just lost time and SRAM data. Which will be lost again if shut-down with no battery inserted.
Still...I am confused by symptoms and goings on...they are all over the place. Moisture in the hand controller flex? Is the EPROM seated ok?
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