Dead HP 35

[teenix]

(10-09-2024 01:19 AM)krazyk Wrote:  Teenix

Just tested 0 ohm resistance from the following with the PCB CPU board still disconnected

Positive lower battery post to left external charging pin
Right most charging pin to right side red wire positive input on PCB
Upper centre external PSU pin to left side black wire negative input on PCB
Negative battery post to upper centre negative External PSU pin.

So it looks like the basic wiring in the main corrosion area is fine.

Sounds good. Next, I would reassemble and connect a charged battery, or 3.75V to the battery connectors, -ve is topmost. The gold bar on the charger port needs to be in place. If it is still a no-go, then I would check the voltages mentioned in post #2.

If the voltages are correct, and still not working, remove the power and check if any ICs are warm to the touch. It might indicate a failed IC.