|HP48SX LCD problem...|
Message #1 Posted by Geoff Quickfall on 15 Aug 2009, 5:06 p.m.
I picked up a completely non functional 48SX about 5 months ago hoping it would be the deteriorated contact foam under the keyboard flex ribbon. That is the foam which holds the the keyboard flex ribbon agains the logic PCA contacts.
It was, and after disassembly, a thorough cleaning of all contacts, including the LCD zebra connectors and a new foam inser the calculator worked perfectly. In fact I removed the connectors, cleaned them, ensured no dust on the PCA contacts or connectors, and then reassembled the calculator.
I put the calculator away without batteries for 4 months. Today I picked it up, installed the batteries (using this example for Chapter 13, Stretch Pioneers) and it now powers up with a vertical line to the extreme right of the display.
Today in an effort to remove the line I have:
1 disassembled and cleaned all contacts again!
2 reset with the reset under the foot.
3 reset with batteries out and reset under the foot.
3 tried all the diagnostics, it passes!
The line is still there! Any ideas?
I found the following link which may explain the problem, alas, not fixable:
HP48SX display problem
My serial number is 3147Sxxxxx
Edited: 15 Aug 2009, 5:20 p.m.