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Does anybody know how to setup/use a multimeter to check iphone parts like dock flex connector, microphone, headphone jack, etc. It would be very usefull since the only way to check for funcionality of these parts is trying with a newone and we can make a mistake. Thank you and sorry for my basic english. Macpatagon
Hi, there are three tests modes on the multimeter you should be carefull with. The first one is the resistor, second the diode and third the circuit test. The multimeter will send out a constant voltage of 9V, if it works with a 9V block battery, and shows in these test modes the value of the resistor, that the diode works or that you have a closed circuit or not. As there are many parts as ICs and transistors on the logic board using a lower operating voltage than 9V, you can easily fry one of these parts in worst case. So if you are using a multimeter in one of these test modes, be sure to disconnect the part to be measured them from the logic board. In worst case you only fried this part and not the whole logic board. How to setup/use the multimeter to test the parts you mentioned is a little longer story. First you will need appropriate cables and clips/tips. Then you will need test setups for the part to be tested. A.e. you will need a cut off headphone plug with blank cable ends to hook a test clip to. For the other end of the headphone jack a very fine tip (like a needle), or a connector wit cables to hook another clip to…..a.s.o. To make a long story short, if you don’t want to repair iPhones and iPod professionally i would stay with changing the part and try if it works. Because its easier and faster.
Yes for some things such as testing if the cable is good between the head phone jack and the other end of the cable that attaches to the motherboard. The cable will need to be disconnected from the motherboard to test that. The test is is called a continuity test. Most multimeters/mutitesters have this function. This kind of test is good for testing switches, such as the on/off switch, the cable will need to be unplugged from the motherboard. This test can also be used on cables from one end to the their end result, such as the head phone jack, again the cable will need unplugged from the motherboard. CAUTION: You do not want to run this test with a multitester across an IC you can harm them. Electricity follows the path of least resistance, therefore electricity will only flow between the path of the multimeter’s test probes. NOTE: You can actually make your own 3 volt continuity tester with a LED that shouldn’t bother an IC. Instructions for doing that are here: http://www.instructables.com/id/Continui… For use as a tester for small things, such as iPone parts, I would modify the design in the instructable to do away with the big clip and use a probe tip on the end of the wire. I would also file down the tips of both “probes” to a fine point to ensure you are only touching and testing what you want to.
