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This is because the resistor was not installed. Install the resistor to solve this issue. The recommended voltage for all backlights is around 3V. The longer wavelength colors, such as red an orange, have lower voltage requirements so make sure to install the resistor.
Make sure to cut the 2 leads on the PCB. Be careful not to cut any others or your LCD might not display correctly.
See here: http://handheldlegend.com/pages/flickering-gbc-frontlight