MacBook Air A2179 No camera detected repair

MacBook Air A2179 No camera detected repair
Device	MacBook Air A2179
Affects part(s)	Motherboard, Camera, Display assembly
Needs equipment	multimeter, soldering iron, soldering station, thermal camera
Difficulty	◉◉◉◌ Hard
Type	Soldering

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Problem description

Addressing issues with a MacBook (820-01958) not detecting the camera.

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Symptoms

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

Solution

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 CC775/CC774 if the traces and vias for PP5v_G3S are not damaged in that area. If damage is seen on and around CC775/CC774, use L6703 as a jumper point. Ensure you have conductivity between PP5v_G3S and CC775/CC774 if you are using those capacitors as a jumper point.
• 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.