16x2 LED Screen Backlight Issues

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i've took delivery of 16x2 red backlit screen replace blue backlit one.  soldered , replaced it, switched on, , seemed good.

i have switch on/off use turn backlight off save power when running on batteries, reason when flick on , off after few times, bottom line use debugging sd card corrupts symbols , sorts.  top line seems ok , whole system keeps on data logging.

bare in mind, exposed @ moment using breadboard:

quote
i've took delivery of 16x2 red backlit screen replace blue backlit one.  just soldered , replaced it, switched on, , seemed good.


how specifications 2 backlights compare.  specifically, both require same size current limiting resistor?

don


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