Problem with HP 25

[krazyk]

Just picked up a HP25 and after cleaning up the battery contacts and supplying 2.6volts of power and selecting RUN mode I am presented with a startup of
0 0.0. . . . . .

So basically the normal startup except the decimal point is displaced one digit to the right and is followed by an additional 6 decimal points making a total of 7

I believe the RAM is working and i can execute the basic + - multiplication and divide as I can enter all numbers on the keyboard after excercising the buttons EXCEPT 4 AND 5.

Would this imply a display chip anode/cathode problem or could the ACT chip still be partially faulty even though its delivering correct results on basic arithmetic?

Does the apparent total loss of 4 and 5 on the keyboard indicate anything specific?

Is there a series of key entries for these Woodstock units that help to deduce more?

When I select Prog mode it simply displays 00 which I assume is normal.

I havent pulled the unit apart yet to inspect the board closely but the unit is in excellent physical outside condition for a 45 year old calculator.

Anyway if anyboy has any ideas about what might be wrong it would be most helpful.

Thanks in advance.