This sounds like you have a failure in the power supply. This could be due to a bad solder joint or a failed component. The part cost should be minimal.
The backlight sounds like it is not getting the full voltage. The electronics mostly will run on 5 volts DC. Below about 4.75 volts things just won't work.
Testimonial: "Thanks for your thoughts Fredy2 ..... that sounds very likely... I'll try that route first. Thanks for your help Writer7"
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