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it can be several things to cause this, from the looks I would immediately say that the batteries needs to be replaced, it takes power to turn on the light and when it tried the power is taken from other components like the lcd, and never actually light because there is not enough power, next it could be the bulb, it could be dead, short circuited. The issue is they are usually hard to replace and or irreplaceable, it needs the be rated the same for voltage a multimeter would help you a lot, to see if voltages are coming from the wires that connect to the bulb. next the watch could be malfunctioning and may no longer have proper working circuity to run the backlight, this will be extremely hard to repair it will be better to replace the inside or take to a jeweler to have it repaired, in any event if you choose to repair it then you look for damaged parts and replace them- in the event that fails take you digital multimeter and trace the circuit to see if you can find the faulty part this requires you to have adequate knowledge of electronics and it would surely help to have the schematics to the watch--Good Luck.
You can change the backlight on a casio wristwatch by holding the Light button, but only if it has an LED light in the side of the screen such as yours does. There is Light Blue, Red, Pink, Blue, Green LEDs in the side of the screen and you can change between them. There is also an option that flashes between all the LEDs when you press the button.
Your battery is most likely failing. The first thing that stops working is light and sound because those functions use the most energy! When your battery voltage is below 2.5 volts the light will stop working!
SEE EVEN AFTER THE REPLACEMENT OF BATTERY --BACKLIGHT IS NOT WORKING THEN THE PROBLEM MAY BE DUE TO THE DAMAGE OF THE Light is electromagnetic radiation WHICH CAUSE THE BACKLIGHT DISPLAY . THIS CAN'T BE SLOVED BY OURSLEVES SO IT IS GOOD TO APPROACH AN AUTHORISED SERVICE CENTER..I HOPE YOU ARE IN THE WARRANTY PERIOD.
Change the battery. This happened with mine along with the battery needing charging more frequently. In my opinion, Casio's assertions that you won't need to change the battery is pretty much of a joke. My jewler concurred.
After changing the battery I can now press the light switch button and the watch works normally.