Casio PRG-80L reads open - Casio PRG-40T-7 Pathfinder

Go to your local Jewelry (watch) H samuels , HINDS bout expect to pay a lot .

go here for the manual > http://www.gshock.com/support/

it's because the contact that sense whether the watch is opened or not is misaligned.
Just open the watch caseback, re-allign the gold contact on the case-back, and make sure it touches the spring in the other side of the watch.

You can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

If you haven't got instructions on how to do this, you can get
instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

Click on my profile (escapement), then click on Tips and Tricks. There you will find link to all CASIO watch manuals.Rate me, please

You can find details here: http://world.casio.com/wat/download/en/manual/
Rate me, plz.

Follow this link:

http://world.casio.com/wat/download/en/manual/

Rate, please.

You can do it yourself. Unscrew watch caseback and undo the contact on top of battery. Read the writings on battery and buy exactly the same one. Do not mind manufacturers (Casio, Maxell, e.t.c.), just make sure the numbers are the same.
Some watch casebacks can be opened only if the watch band is removed, so, remove it if needed, just don't forget to memorize where every part and screw was fitted. Memorize how the battery is fitted and do not put the new one the other way around as this can damage your watch.
Actually there is nothing difficult - only you have to put everything back exactly the same way as it was. If your watch will be left without battery for more than 3 minutes, you will need to reset your watch after replacing a new battery, but it's easy if you've got users manual.
Good luck.

Do not forget to rate, please.

Casio solar watch has no battery it is powered by solar,but there is a storage capacitor like a battery.It will last for 5years that capacitor.Try to hold all the buttons and press hold simultaneuosly for 7 seconds this for reset the watch..

Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE.