Chosen Solution

Thank you for your time, I bought an un used ti-92 plus. The cursor pad requires significant force for down and left, but nicely clicks for up and right. Any help from your experience is very helpful. Thank you for your time,

  • Erik

The conductive “paws” on the silicone button membrane where not landing flat onto the logic “prints” on the circuitboard.

This is do the design of the D-pad button. It pivots about the origin, therefore “tilting” the “rubber button/paw”, which causes the “paw” to not land flat. Landing flat is important to cause continuity across the “print”. Thus, By modifying the D-pad, one can cause the “paw” to land flat. The idea is to “pitch” the buttons interaction with the D-pad, so that, by the time the “paw” rotates down, it lands flat on the “print”.

Last note: Applying small amounts of silicone grease (Plumbing Section), allows the rubber “paw/buttons” to slip in the interaction against the epoxy and slop into its natural flat position. Silicone grease will not eat the plastic like normal grease would.

Hi, The contacts for the left and down cursor may be dirty. Being an un-used device they shouldn’t be worn out. Here is a link to the ifixit repair guide for the device. Here is an image taken from the repair guide. I have highlighted which contacts need to be cleaned, both on the board and on the rubber pad. (The rubber pad contacts have a conductive coating which bridges across the contacts on the board, when the button is pressed down completing the electrical circuit) Use a Q-Tip moistened with IPA 90%+ (Isopropyl Alcohol - available at most pharmacies - do not use ‘rubbing alcohol’ as it is not as effective)

(click on image to enlarge for better viewing) Take note of the caution issued at Step 9 in the ifixit teardown instructions Alternatively since you stated that you bought an un-used device, did it come with a warranty at all? If so follow up on getting a warranty repair or replacement as by trying to fix it yourself as shown above, will void any warranty. Hopefully this is of some help.