MacBook Air A1932 No camera detected repair

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MacBook Air A1932 No camera detected repair
Device MacBook Air A1932
Affects part(s) Motherboard, Camera, Display assembly
Needs equipment multimeter, soldering iron, soldering station, thermal camera
Difficulty ◉◉◉◌ Hard
Type Soldering, Software

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Problem description

Addressing issues with MacBook A1932 with logic board 820-01521 not detecting the camera.

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  • Camera not detected
  • Possible burned or exploded L8570 filter on TCON board


Diagnostic Steps

Check L8570 Continuity

  • Use a multimeter in continuity mode to check L8570 (Figure 1).
  • Normal reading should be close to 0.01.
  • If L8570 is blown or burned, proceed to the "L8570 blown or visibly burned repair steps" below.

Test with Known Good Display

  • Verify camera function using a KNOWN GOOD display assembly.
  • If the camera works with a different display, the original display might be faulty.
  • Make sure to check L8570 before diagnosing the display issue.

Repair Steps

Camera Works with Known Good Display

  • If camera works with a known good test display, replace the display assembly.

L8570 Blown or Visibly Burned

  • Understand that L8570 failure indicates a catastrophic short within the TCON board of the display or a melted/corroded display cable/connector.
  • Repair L8570 only after addressing the display issue, as L8570 might fail again if the display issue persists.
  • When replacing L8570, address corresponding pad and trace damage.
  • Use 36 or 37 AWG enamel coated copper wire for jumper wires due to webcam and ambient light sensor power requirements.
  • The closest recommended jumper point for the input side of the filter (PP5v_G3S) is R7100/C7296 if the traces and vias for PP5v_G3S are not damaged in that area.
  • Apply conformal coating to jumper wire.
  • Use a 120 Ohm ferrite filter rated for 1.5 amps (402 package size).
  • After replacing L8570 and addressing trace issues, replace the display assembly or repair it by replacing damaged cables/connectors.

No Camera Function, L8570 Normal

  • Attempt to restore T2/BridgeOs firmware via Apple Configurator 2 by entering DFU mode.
  • Ensure your Mac is on the latest macOS version.
  • Follow Apple's support article on reviving or restoring T2/BridgeOs firmware.
  • If no camera function after firmware revive, and other causes are ruled out, U8595 might be faulty, or there could be trace/resistor issues between the camera connector/U8595 or between U8595 and the T2 chip.
  • A hardware issue with the T2 chip might also cause camera detection problems.