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Crashing when switching on the display backlight

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  • Crashing when switching on the display backlight

    Hi,
    I am using an uLCD43 PT(SGC) in a product. Out of twelve units two exhibit a problem whereby if the backlight is switched off for more than fifteen minutes (when the unit is in a standby mode), the uLCD43 crashes or "locks-up" immediately after the command to switch the backlight back on. If the backlight is switched off for less than fifteen minutes then the startup is OK, as it is if I skip the backlight off command during the going-to-standby sequence. Comms are maintained perfectly when in standby. Am I losing my mind or has this been seen before? Any suggestions to fix it? I am going to try heavier gauge wires in the power supply cable.

    Mark

  • #2


    Haven't seen it before, but it certainly sounds like a power supply issue.

    Try monitoring the 5v line to see what kind of a dive it takes when the backlight is turned back on.
    Mark

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