Casio says open

Try the links. Casio has two distributors for parts.

MANUAL ' PRO TREK - Mens Watches - CASIO

https://protrek.com > asia-mea > support
WATCH MANUAL ARCHIVES. Use this page to download a copy of CASIO watch manuals in PDF. To download a PDF file, enter the four-digit (or three-digit) module ...
Missing: movement ‎' Must include: movement

Buy Parts - Casio Support Page ' Casio USA

https://www.casio.com > support > buy-parts
For end-users looking to purchase Casio watch bands and watch parts, please contact one of our Parts Distributors* below: West Coast PacParts, Inc.
Missing: prt500 ‎1376

Casio ProTreck PRT-500 Please Help - where do the springs ...

https://www.watchuseek.com > ... > Casio G-Shock
Dec 10, 2013 - Hi there! After finding my old PRT-500 in a drawer I took it to a shop to replace the battery. They messed it up, the watch displayed "open" ...
Casio PRT-500 issues/ watch to replace it - Watchuseek
Jul 11, 2008
CASIO PRT-500. Please HELP ME. - Watchuseek
Oct 10, 2006
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mcdevito75 here, Casio uses an LCD crystal, Liquid Display Crystal, during a battery change any, any un do pressure remopveing or replaceing the battery could destroy the LCD. Take my advise, with a casio watch, look for a small watch repair shop in your area for the battery change. I"ve ruined many of my casio watches during battery change.

mcdevito75 here, Casio watch with the LCD display, any wrong pressure on this display and your Casio is ruined, the liquid display can break very easily. BEST BET, look for a small watch repair shop in your area for this battery change.

mcdevito75 here, Best Bet, look for a small watch repair shop in your area to cahnge the battery as any pressure on the display while changeing the battery on a Casio watch will break it.

mcdevito75 here, Best Bet, bring your casio to a small watch repair shop in your area, The LCD display can be ruined while replaceing the battery, useing to much pressure, Let the watch shop change the battery.

You don't say how old the watch is and whether it has always had a display problem. I have seen several watches with weak displays, but generally they are older watches and I suspect the problem involves a corroded contact somewhere in the "movement". You might want to visit the Casio website and download a copy of the manual for your watch. It may say something about the display. If you watchis fairly new it may still be under warranty and again, contact Casio to see what you need to do.

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.

1
ensure all three of the springs are present
the 2 at the top confirm that the case is closed the on at the bottom sends the sound signal.

2
ensure the metal casing on the back of the movement is not touching the back. and check the movement is correctly seated

This may sound dumb but make sure the battery is in the correct side up. There should be a + or - symbol on top of the metal piece that snaps over the battery. If that's correct get a pair of tweezers and spread them open, and touch one side to the top of the battery and the other side down inside a little hole with ac marked beside it. That will reset the watch, and your display should come on.

I will buy it from you - full price.

[email protected]

Thanks.