HP 41C DOESN'T WORK
Posted: Sun Dec 12, 2010 10:38 amHello thanks for registration, I'm new on this board! 
I have a 41c calculator which I bought used on e-bay; at the beginning I found a little problem in displayng the second and third characther from the left of the display: any segment not displayed properly, then I tryed to forget this problem and delay the fix of it. Yesterday I opened the calculator, thinking to find a bad solder joint between the keyboard printed circuit board and the display board as the_boxer did, or simply trying to clean the contacts (the battery ones were very clean). well, to replace the black paper cover I disconnected the CPU board form the keyboard.............the result was that at the beginning I had a lightly bad working calculator and now it doesn't work at all!!! The display doesn't show anything
I thought that maybe the CPU board was not touching properly the keyboard printed circuit. there is a connector that never I saw before (two white soft plastic stripes), I tryed to clean it with alchool (the display at that time was still showing something, whwn moving the claculator:segments letters and numbers). then I thought to fix it with a small amount of superglue around the bottom screw holes, so that the two printed boards were in touch, but as I told you The display doesn't still show anything
Anybody who can help me to fix this problem, or, at least to make a diagnostics?
Thank-you a lot
I have a 41c calculator which I bought used on e-bay; at the beginning I found a little problem in displayng the second and third characther from the left of the display: any segment not displayed properly, then I tryed to forget this problem and delay the fix of it. Yesterday I opened the calculator, thinking to find a bad solder joint between the keyboard printed circuit board and the display board as the_boxer did, or simply trying to clean the contacts (the battery ones were very clean). well, to replace the black paper cover I disconnected the CPU board form the keyboard.............the result was that at the beginning I had a lightly bad working calculator and now it doesn't work at all!!! The display doesn't show anything
I thought that maybe the CPU board was not touching properly the keyboard printed circuit. there is a connector that never I saw before (two white soft plastic stripes), I tryed to clean it with alchool (the display at that time was still showing something, whwn moving the claculator:segments letters and numbers). then I thought to fix it with a small amount of superglue around the bottom screw holes, so that the two printed boards were in touch, but as I told you The display doesn't still show anything
Anybody who can help me to fix this problem, or, at least to make a diagnostics?
Thank-you a lot