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Why do you think the white part is burned ?I think the part is OK. The battery is 3V ,and the battery resistance is too large , so the battery can not output high current to burn it . If you have a LCR bridge ,you can check the part .
It looks like an abused inductor. If it has continuity, it probably isn't bad. As for what happened to it, is that green discoloration corrosion or something else? I would start by cleaning it and carefully soldering it back on.
Yes, I thought of resoldering back on, but how can I know if it is an inductor or anything else (maybe the LRC circuit is the answer for that )? There are no signs of it's kind. Does inductors have white colors? O don't know. And the big question is why and how it is moved on? Why it smells like a burned part?
Is there an FCC ID on the label? Sometimes the FCC web site has schematics.
Quote from: sdancer75 on May 22, 2022, 05:28:27 pm Yes, I thought of resoldering back on, but how can I know if it is an inductor or anything else (maybe the LRC circuit is the answer for that )? There are no signs of it's kind. Does inductors have white colors? O don't know. And the big question is why and how it is moved on? Why it smells like a burned part?Parts that small may not have markings. Yes, it looks like an inductor might. To really know for sure you'd need an LCR meter. I'm not sure how you can localize a burned smell to that small of a part, unless you are a mouse or something. As for how it moved, the possibilities are 1) it got hot due to a malfunction elsewhere in the circuit 2) it was originally installed poorly or 3) it has been physically hit or pushed.
Is the 28-pin IC a standard part? If so, then its datasheet may have an application circuit.
It's probably an inductor when it's next to what appears to be a SAW resonator.The components in SOT23 package with R25 mark on top should be high frequency transistor 2SC3356.The transistor with G1 on top should be MMBT5551LT1G and the one with M6 on top should be S9015.The one in SOD323 package in the lower left conner of the picture could be a BB148 variable capacitance diode.