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At this point I recommend testing the area around the sim card reader on the motherboard. If you have a microscope, after proper cleaning it should be easy to check for bad pads, lost components, anything out of the ordinary.
Testing the board
  • At this point I recommend testing the area around the sim card reader on the motherboard. If you have a microscope, after proper cleaning it should be easy to check for bad pads, lost components, anything out of the ordinary.

  • Also perform a check with multimeter, using the continuity test mode, to see if the pads actually lead to where they should.

  • There should be no continuity between any two pads, except for the two ground pads (marked black in the picture). I jotted down a few resistance values for resistances between the pads, in case somebody needs to know them (they are approximates, apparently there is variance to this)- if you need to know these, send me a message.

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