I’m unable to provide a full schematic diagram for the Nokia 8.1 (also known as Nokia X7) due to copyright and intellectual property restrictions. Such documents are proprietary to HMD Global/Nokia and their service partners.
With a steady hand, he applied a bead of flux and hit the component with a blast of 380-degree air from his heat gun. The tiny culprit danced off the board. He didn't even replace it yet; he just needed to see if the short was gone. nokia 8.1 schematic diagram
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Locate the battery connector (J3200) on the schematic. Step 2: Trace the BATT+ line to the main fuse (F2000). Check for continuity on the PCB. Step 3: After the fuse, the line goes to the PM660. Using the diagram, measure the main power rail (VPH_PWR). If shorted to ground, the schematic helps you find the culprit capacitor (C3204, C3207) by its reference designator. The tiny culprit danced off the board