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It maybe a flex problem or keyboard problem. The reason why I said it maybe a flex problem is because flip phones are fond of having flex problems because of the constant open and close of the flip. It makes the flex wear/worn out. And it maybe a mere disconnection. Which ever the case maybe, the phone needs to be disassembled in order to check/know what's wrong. Regards.
The symptoms you give are exactly the way it is when the lock function is used. The wall control and the keypad will work but not the hand remotes. If holding the lock button for 3 seconds doesn't change it you should hold in the smart/learn button for 6 seconds. This will erase all remotes from memory and only the wall control will work. Now program it for the remotes and the keypad.
To program the keyless entry,
first locate the smart/learn button. On the chain drive models, this button
is on the end farthest from the door. On the belt and screw drive models, it
is on the right side as you face the door from the opener. You simply
press and release the smart/learn button. You now have 30 seconds to
enter your four digit PIN number into the keypad and hold the enter button
for five seconds. Wait one minute and test the keyless entry by
entering your four-digit PIN number and pressing enter. With some Security+ models, you
can also program your Model 940CB Wireless Keyless Entry without climbing a
ladder, right from your Multi-Function Control Panel. Simply enter your
pre-selected code and press and hold the enter button on your Keyless Entry.
Then press and hold the light button and the pushbutton on your
Multi-Function Control Panel. The garage door opener lights will flash to
confirm that the Keyless Entry has been successfully programmed. To program the keypad,
first unplug the garage door opener from the electrical outlet. Next,
remove the nameplate from the console that the keypad plugs into and locate
the program/operate switch. Flip the switch to program. Next,
enter your desired four-digit PIN number into the keypad. Slide the
switch back to operate, and plug the garage door opener back in. The
keypad should be programmed. You can find additional information at: http://www.usdoorcontrol.com/kbase/liftmaster-main.html#14
Its designed so that the camera only works with the phone shut. There are no camera functions controlled by the keypad. For instance if your camera shield is closed and your phone is open if you then open the camera shield the phone will tell you to close the phone.
This is a common problem, it has to do with the keypad flex. either the connector on the top part of your phone is unpluged or your flex is damaged. Open the top of the phone where the screen is at (4 torx screws) genlty remove the cover. you will see two connectors, one that goes to the camera, the other is the one you want. genlty pry it off upwards, I would also clean it with some IPA (rubbing alcohol) and a brush, re-connect it pushing down firmly, you will fill it when it connects. if it doesnt work, you can purchase a new flex, if you need repair help, let me know I can try to repair