Questions about my dead(almost) 48S

[jch]

Did you tried to remove batteries and short power terminals ?

If you are lucky, it may be only a "latch up" ?

(07-25-2015 07:29 AM)BarryMead Wrote:  It is also possible that the input protection diodes went into "Latch Up" when the TX voltage went .5V above
the power supply voltage. To clear the "Latch Up" state remove the batteries and short the 3V and GND terminals of the battery for a few seconds to drain any power supply capacitors. Then reinstall the batteries to see if the calculator wakes up again. If you had left the calculator in the "Latch Up" state for any length of time it is likely that the batteries suffered a significant drain, and it might be wise to start with a fresh set of batteries after the battery-removal / Discharge procedure. Good Luck, Barry

Regards.
Jean-Christophe.