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HP Forum Archive 20

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Slow LCD display - fixable?
Message #1 Posted by Cristian Arezzini on 12 Jan 2012, 3:03 p.m.

I recently acquired a calculator, it's the same model of my very first scientific calculator - alas it's not an HP, but I really wanted to have one back, as the original was thrown away many years ago. It's an ELORG 51, which is the same as the Elektronika MK-51. The sample I found is in good cosmetic conditions, and it works; but the LCD is "slow". I don't know how to explain exactly, but it sort of looks like each segment takes a long time to become black. It's a little like when batteries get very low, only that in this case, once the segments become black, it's a "bright" black, with good contrast, not faded. I disassembled the calculator, and the inside is in great shape: no corrosion anywhere and no visible damage. But the only components are the main processor, two things that look like dark red/brown resistors, and a small blue thing with two tiny leads on its side, which could be a capacitor. They are marked R1, R2 and C1 but it's a strange font and I don't know if they're actually Latin characters or cyrillic. Does anyone know these symptoms? What went wrong in the circuit? Is it fixable?

Thank you in advance, Cristian

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