HP 35 display

[John Garza (3665)]

Although there are lots of relatively cheap donor machines on the auction site, replacing the LEDs can be tricky. You have to ensure you get ones with similar brightness (letter code stamped on the back), and ensure they are lined up properly, and that all pins are soldered. Usually, you have to replace all three LED modules from a donor machine unless you get lucky and your donor has the same brightness letter code. I recently repaired a 65 with a dim segment on a single digit by replacing all the modules with donors from a 67 keyboard that was a spare parts unit.

-J