HP 32SII success and woes

[jebem]

(02-16-2015 02:33 PM)Sanjeev Visvanatha Wrote:  - The calculator works fine (with low batt indicator on) if only 2 of the LR44 batteries are used. A 3V 32sii? I am not an electronics person, so this is another qualitative data point I have on the subject.
- Would this support the resistor being open?

Now, that is interesting information!
If the problem lies inside the SoC, for instance with a few bad logic gates, then it is probable that varying the power supply up or down can allow these gates to start switching in sync with the rest of the circuitry.
If you have access to a laboratory adjustable regulated power supply, it was interesting to find out at what voltage level does it start misbehaving.

But it seems that this resistor is in fact a jumper, as its label has the value "000" (Zero Ohm) connecting the circuit to the metal plate using that spring connector.
The jumper is there for a reason, so if you can take the risk to untwist/twist once again the 6 metal clamps, I believe it is worth the try.

PS - Thank you so much for your previous information regarding the LCD display removal.