Chosen Solution
Hey guys, friend of mine brought me this phone without working sim (no sim message in the left top corner). Immidiately after openin, I’ve recognized something bad about the sim card reader, it’s full of connected solder.. any idea how to repair this stuff? I’have microscope and soldering and hot air station.
Update (11/21/2019) That’s what I’ve found underneath. Is there a possibility to repair those pads?
Arbaman may be correct about audio IC repair. · Clean the solder up so there are no bridges. · Check that (#06#) brings up an IMEI number. If it doesn’t, remove the logic board from the housing and check the audio IC, you will probably find it has been reflowed or repaired with jumper wires. If it has been worked on the most likely scenario is that they have put too much heat on the audio IC causing the solder balls under the baseband CPU to expand and bridge causing the “no sim and or searching no service.” This will require the baseband CPU to be removed and reballed, it is not an easy job. If the repairer was not experienced they might have thought the sim tray was the problem. If (#06#) does bring up the IMEI number and there is no sign of audio IC repair go ahead and replace the sim reader.
If you are skilled enough and confidant enough then i would replace the sim reader, probably save you a lot of time than trying to make the bad one good
Put more flux and re-solder with pencil bit iron.
