Fixing all your keys
AO Silver Member
Join Date: Mar 2001
Location: United Kingdom
County: Tyne and Wear
Re: how to open a 147 key fob
If you can feel the switches clicking then the chances of both failing at exactly the same time are pretty slim and point to a different problem. Obviously if the key rattles or there is no switch to feel underneath the button then you may have a loose switch.
If you have one of the all-plastic keys you can check for dirt build-up without opening the key. Take out the battery and *carefully* abrade the battery contacts inside the key. A nail file is good, or use a sharp knife with great care - not for your fingers, for the delicate circuit board. If you have bad contacts then this is where the problem will be. You can also see into the key and see if the board has shifted. If the key is the softer rubberised feel then they are a better design and dirt will not be the problem.
Has the key been damp? Peer into the tiny battery slot and look for blueish fuzz around the tracks. These keys rot easily when damp even if for only a few days. Another common fault is a break in one of the legs on the main chip. Don't try to fix either of these unless you *really* know what you are doing or you will fry the key.