Heh. Other people are not so willing to give up their consumer rights.
In the US, at least, warranty law allows you to use third party parts and not be punished for it by the original manufacturer.
That's whey we can add memory to our laptop, or different wheels on our car, without voiding the warranty.
Obviously the manufacturer does not have to cover those third party parts, but neither can they disable them or tell you that you cannot use them.
That's not entirely true. Lots of companies have components in their products that can ONLY be replaced by an OEM component by the manufacturer (or their authorized agent). There are allowances within the Magnusson Moss Warranty Act that specifically allow for this.
Take automobiles as an example. Many computers can ONLY be purchased from the OEM, and require specific programming/activation before they will work. If you find a used one from Vehicle A and install it into Vehicle B, it will not work. Some examples of these include instrument clusters (so people can't tamper with mileage on vehicles) or engine control computers (to meet emissions requirements). Major manufactures (like BMW) often make it so primary computers can't be re-used. This prevents chop shops from taking multiple stolen vehicles and combining the parts from several to make one good vehicle. On a BMW, for example, the transmission computer is integrated into the transmission itself. So if someone tries to install a used (stolen) transmission into another car it won't work.
Edited: Forgot a couple more things. A manufacturer is allowed to supply a list of specifications that parts must meet (strength of a steel bolt, current carrying capacity of a connector, color accuracy of a display). They are also allowed to specify an exact procedure that must be followed when replacing a part (which might also involve specialized equipment). If a third party doesn't use a part that meets these requirements or if they don't follow the procedure, then your warranty is toast.
The idea that you can replace any part wherever you wish (and still retain warranty) is simply false.
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