Re: Faded display on HP15-C Message #6 Posted by Vieira, Luiz C. (Brazil) on 29 Jan 2005, 6:38 a.m., in response to message #1 by Larry
Hi Larry, falks;
I once repaired an HP15C overseas (it was sent me for repairing procedures from an e-friend in Europe) and the problem was that some segments in some digits 'faded' as the display got filled with digits after the fourth one, right to left . I'm not sure yours has the same problem, maybe the fading is constant. In that case, some digits became almost unreadable after the last posible one was entered.
I soldered all terminals of the threee IC's and it did not solve the problem. In fact, had to completely disassemble the unit, remove the LCD, clean all pads and both polymers and rebuild it all again. It worked perfectly fine after that, and the last news I read from him (about one year later) were good ones.
I'm not sure this procedure will fix your HP15C's problems, mostly because I don't know if the LCD itself is actually faded. I saw some Voyagers with digits not as dark and consequently not as sharp in the edges of their segments as others. I own eight Voyagers: one 11C, two 15C, two 16C and three 12C (I also have two 12C Platinum, but it is not a Voyager in concept... I don't even know if the poor little things have a family name...). The two newer HP12C (with one single 3V, button-type, flat battery) have the worst LCD contrast, and one of the HP16C (the earliest one) either has slightly pale digits.
Maybe, just maybe, your HP15C is good as it is.
Best regards.
Luiz (Brazil)
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