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Backlight on Parallax LCD not working?

Using a Pixaxe 28X1 and a Parallax LCD.

Can not program the backlight on a Parallax LCD to come on.

When I put the LCD to test mode, backlight on OK.

I read the manual for the LCD but did not help.

here is the code:

pause 1000
let pins = %11111111
serout 0,T2400,(1,2,"Hello World")
pause 200
serout 0,T2400,(124,157)           ;turn on backlight
pause 200
end