|HP 34C display update|
Message #7 Posted by james summers on 6 Apr 2012, 10:17 a.m.,
in response to message #4 by Luiz C. Vieira (Brazil)
Well, opening it was a lot easier than I expected thanks to following Geoff Quickfall's guide - thanks Geoff!
The previous repair by persons unknown to the scew-post is shown circled in red above.
At least I know for sure that mine is a soldered unit. All soldered connections look fine with the exception of the circled one on the 8 pin chip nearest the display.
I understand from this post that this chip is part of the constant memory so I think that the connection is OK despite the appearance so will leave it alone for now.
The general appearance inside is quite clean with only a little bit of green corrosion on the ribbon cable to the battery contacts which I am trying to remove with a dilute vinegar bath - the shot below shows the main board resting on a cup with the battery board soaking in the vinegar/water mixture,
Finally, a shot of the display unit. Unfortunately it is not too clear but the red lines show the rough alignment of the minus bar which is presumably a result of the jolt.
So I guess I'm now on the search for a donor machine with a good display.
Edited: 6 Apr 2012, 11:27 a.m.