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HP42S - Display repair
09-01-2016, 02:42 PM
Post: #3
RE: HP42S - Display repair
There have been a few discussions about replacing the LCD on a 42S, with observations about which calculators make suitable donors (like 17Bii) and variations in LCD models over time (try to get a donor produced around the same time as your 42S).

Have a look at the article Pioneer "Observational Internals" (article #5) in the old article archive here:

There is some good information on opening the case and removing the LCD. I found the article and others in the article list useful when replacing a "cooked" LCD display on an HP22S using an LCD taken from an HP14B donor. All you may have to do is replace the zebra stripes, in which case a donor in the same display class (131 by 16 graphic) as the 42S may be all you need.

Usual warning: Take care, work slowly, watch how much force you use on the LCD, and try to be as accurate as possible with alignment. I was delighted to see the new display light up properly on powering the calculator after the repair!

Remember kids, "In a democracy, you get the government you deserve."
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Messages In This Thread
HP42S - Display repair - TomC - 08-31-2016, 01:29 PM
RE: HP42S - Display repair - wojtek - 08-31-2016, 04:16 PM
RE: HP42S - Display repair - mfleming - 09-01-2016 02:42 PM

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