HP Forum Archive 14

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HP 11c Message #1 Posted by Dave on 11 May 2004, 9:58 p.m. The lower line(USER, decimal, and comma) of my LCD screen on my HP 11c has become very dim, almost unreadable. Is there anything I can do to fix this problem. Thanks.

Re: HP 11c Message #2 Posted by Stephan (CH) on 12 May 2004, 2:11 a.m., in response to message #1 by Dave Have you tried with new batteries? Not ment to be offensive, but somtimes one looses the focus for the easiest. Happend to me before. Hope that helps. Greetings Stephan. (1234)

Re: HP 11c Message #3 Posted by Vieira, Luiz C. (Brazil) on 12 May 2004, 2:53 a.m., in response to message #2 by Stephan (CH) Hi Dave, Stephan; I agree with Stephan that it is a plausible solution. But if fresh, new batteries don't work, it's more likely that you have a bad contact (cold soldering) in one of the terminals of the R2D2 (RAM-ROM Display Driver), the big chip that drives the LCD segments and status indicators. I had many Voyagers I repaired with this problem. Cleaning terminals and fast resoldering (VERY fast) was, in all cases, the solution. The only one I had troubles with was an earlier model with the LCD, IC's and electronic components built in in a separate unit with flex circuit. Battery leakage corroded part of the copper trails and the flex circuit was simply lost. but this is a rare case... (sorry, I didn't mean to let anyone down, just facts) If Stephan's suggestion does not happen to succeed (I hope it does), opening the calculator and cleaning IC's terminals is the other solution. At least, there are possible solutions, right? Best regards and success. Luiz (Brazil)

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