hp41c to hp41cv CPU swap

[GeorgeOfTheJungle]

Hi,

I've replaced the cpu pcb, and it works but not perfectly. With the CV board the display is a lot dimmer than before. I have checked the LCD voltages @ L1 L2 and L3, at the pins 17 18 and 19 of the display driver assembly: the CV board gives 1.04v, 2.0v and 3.14v whereas the C board was giving 1.1v 2.22v and 3.4v.



Also, the calculator now shuts down after 40 seconds instead of the usual 10 minutes...

Any ideas?

Thank you,
Jorge.