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What Casio model is it?
Do you still have a bright display?
Have you tried removing the battery to reset it?
In some Casio watches like the Protrek range the back light button fails to activate the display light. This is sometimes caused because the earth flange that completes the circuit when pressed has bended to far or snapped and fails to complete the circuit.
More info about the watch may help find a solution. mean time change the battery it may start working again. Good luck
Just tried this procedure to replace a watch battery in a POD 535 and did not work...my version of the watch might be different, all I am saying is it did not work with my watch. The procedure that worked with my watch When you have replaced the battery reset the watch by placing a small screw driver across the two recessed contact next to the lower battery clip. The digital display will reset and you will see four zero's flashing...if not press the winder button once, or reset the watch again. This process is to get all the hands at twelve O clock position...press and hold the top right hand button and the hands will start revolving...you can let go of the button once the hand are moving. Pressing the top button again will stop the hands and a short press will move the hands in small increments. Once the hands get close to 12 press then press the button once and then press the same button in short pulses to align all the hands on the 12 position. Wait a short time and the watch will find the time signal and both the digital display and hands will be aligned and showing the correct time.
Inside the battery compartment, you will see the battery is held down by a clip. Carefully remove the clip and eject the battery. Insert the new battery and replace the clip. If the battery clamp indicates you should do so, quickly press the reset button twice. Then reattach the back of the watch. If the watch display remains off after replacing the battery, press all buttons at the same time to reset the display.
The open code is saying that your case isn't closed properly. Without seeing it, it's hard to tell if you opened/closed the case correctly. If you believe it is closed properly, look in your user manual and see if there is a master reset button and try that. Did you change the battery yourself or did you have a jeweler do it?
NO, don't open the back cover you will break the water seal.
Reset the wrist unit. Resetting clears the date and time settings.
Press all buttons except the Light button at the same time until the display is filled with digits. Press OK.
If this does not work, have the batteries checked.
The battery is CTL 1616 and I had the same occurance when I opened up my model Casio model 3043. I needed to use the battery to test my model 2767 and find out if a new battery would bring it back to life (yes, it still lives). After replacing the battey back into my 3043, I jumped the (ac) to (-) and at first the watch would indicate all was well but then it would revert back to "open". I tried over and over to try and get the "open" display to clear but I was not successful. I then thought to go ahead and replace the back on the case to see if the three contact springs would change the display and sure enough, "open" no longer was in the display. The watch works perfectly as before. As for the 2767, as soon as I jumped the (ac) to (-) the "open" display went away. There is only one spring contact to the back case on the 2767 model. Unfortunately I do have an extra spring that fell out when I opened it up and I have no clue as to where it goes. I have not found anyone who can help me on the location for the shorter spring. Any advice would be most helpful.
On the solar charge watches, they use a chargeable Lithium battery. It is NOT an off the shelf regular battery! It is best to send the watch to the factory service rep in your area for a battery change.
In many of these models the battery is using solder contacts to the circuit board. The person changing the battery will require the original spec battery, and be equiped to do surface type soldering.
When working on this watch, the factory service will change the seals and do a pressure water resistance test. The regular corner watch service store is not equiped to do this type of testing.
Normaly, the battery in solar watches should last more than 5 years. Some are going past 10 years!
Try holding all of the buttons down at the same time and then releasing them. This should reset the watch. If that does not work, then you need to take the back cover off again and briefly create a short (with a metal screw driver for example) between the battery and the 'brass' casing.
Hope this works for you!