We will be closed on November 25, 2021 and November 26, 2021 in observance of the Thanksgiving holiday. We will resume normal operations on November 29, 2021. Wishing you a safe and happy holiday from all your friends at SparkFun!


Receive a free SparkFun USB Thumb Drive with every order this weekend. Details.


Member Since: June 3, 2014

Country: United States

  • These LCD's need cleaning. I have an average failure rate of about 15-20% on delivery. The most common problem is that the contrast is too high, and there's constant flickering / changing of contrast compared to the other 80% of them.

    The solution is fairly simple, unclip the LCD from it's board and clean the pads on the PCB with 99% IPA. Then remove the lcd back plate and contact bar. Sometimes the contact bar is stuck fairly well to the glass, peel off carefully. Clean the contacts on the LCD glass with IPA, if any residue from the contacts is left on, rub it off carefully with IPA / tissue.

    Clean the contact bar with IPA both sides.

    Reassemble, making sure you don't have even the smallest spec of dust on the bar or contacts. The slightest spec will cause the bar to raise slightly, and that and adjacent contacts to not make contact, or be intermittent.

    I think the root issue is non-clean assembly, flux on the pads and dust.

    Given that these units are previously loved displays, probably general muck / grime doesn't help either.

    Also gold contacts on the PCB instead of tinned would help with contact.

No public wish lists :(