HP 41C DOES NOT BEEP

[jebem]

(08-30-2014 05:31 PM)aurelio Wrote:  I think maybe the "beep" missing could be due to a cold soldering, I added a magnified pic of the board and it seems the upper point could be one of those.

Hi Aurelio, good work!
After getting this far, if I were you I would use a new 15 watt low power pen soldering iron to unplug the two wires.
Then remove that solder mess on the PCB. Clearly it was not correctly soldered.
Now you need a audio oscillator (I use my multimeter that has a built in 2Khz signal) to test the buzzer and make sure it works.
Then resolder the wires using a low melting point good quality solder, using adequate heating to make a good solder joint (if the soldering iron requires more than 2 seconds to make an good melting it means you are using a underpowered tool).
Good luck with it.