Hello and asking for help with HP 67 power unit

[ThomasF]

(11-23-2021 06:16 PM)Tapti Wrote:  Hi Thomas,
thanks for telling me your experience. Which are the symptoms pointing towards a burned ACT ? Perhaps this is also the case with my 67.
Greetings
Stefan

Hi Stefan,

In my case, only some single digits lighted up in the display (quite bright), typical to the right of the display, no response from the keyboard at all, not always the same character.
E.g. like this ( were '.' is a empty digit):

Code:

..........00...

Mostly the same result at every power up, not always the same digits, sometime no digit at all, but it never worked again (even for short times after power on) until I replaced the board.

So not really the same problem as in your case (if not the problem is temperature related). If lucky it could be a bad solder, so maybe a visual inspection of the board could be a good thing to do.

Cheers,
Thomas