I am curious if a 0402 resistor could go from 43 ohm to 0. In electronics class and my experience a resistor can degrade and gain resistance all the way up to not being able to conduct at all. I have never heard of a resistor decreasing in resistance and becoming 0 ohm or a dead short… that's not the direction they fail… or so I thought.
I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors flying. I was able to recover the 3 resistors and I measured the values: 15 ohm, 15 ohm, 0 ohm.
Damn they were not all the same, I was able to acquire the schematics (yay) The problem is as I read the schematics I need a 15 ohm, 15 ohm and a 43 ohm 0402.
This has been confusing for me because I didn't know that a resistor could become a 0 ohm resistor from applying too much hot air…. or did it, how could it?
I proceeded to look for a spot that I could have maybe knocked a 4th 0 ohm resistor out of place and that perhaps I just didn't recover the 43 ohm but I do not see a forth place that is missing a resistor. I would just appear as that somehow this resistor became a 0 ohm resistor. I proceeded to closely look at the resistor to see if perhaps some little bit of solder or something was causing a direct short but I don't see any material causing a bypass of the resistor.
I obviously don't want to put back a resistor measuring 0 ohms back when it should be 43 so I will have to order one… but I feel like perhaps I am missing something. I keep reviewing the schematic and attempting to follow traces but it is very difficult with the black coating covering the traces. I have a hard time believing a 3 resistors that got the same heat that only one would somehow lose resistance and I should keep reviewing things.
I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors flying. I was able to recover the 3 resistors and I measured the values: 15 ohm, 15 ohm, 0 ohm.
Damn they were not all the same, I was able to acquire the schematics (yay) The problem is as I read the schematics I need a 15 ohm, 15 ohm and a 43 ohm 0402.
This has been confusing for me because I didn't know that a resistor could become a 0 ohm resistor from applying too much hot air…. or did it, how could it?
I proceeded to look for a spot that I could have maybe knocked a 4th 0 ohm resistor out of place and that perhaps I just didn't recover the 43 ohm but I do not see a forth place that is missing a resistor. I would just appear as that somehow this resistor became a 0 ohm resistor. I proceeded to closely look at the resistor to see if perhaps some little bit of solder or something was causing a direct short but I don't see any material causing a bypass of the resistor.
I obviously don't want to put back a resistor measuring 0 ohms back when it should be 43 so I will have to order one… but I feel like perhaps I am missing something. I keep reviewing the schematic and attempting to follow traces but it is very difficult with the black coating covering the traces. I have a hard time believing a 3 resistors that got the same heat that only one would somehow lose resistance and I should keep reviewing things.
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