View source for MacBook Pro A2289 No camera detected repair

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==Problem description==
Addressing issues with MacBook Pro ''820-01987'' not detecting the camera.
[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
==Symptoms==

* Camera not detected
* Possible burned or exploded L8504 filter on TCON board

==Solution==
===Diagnostic Steps===

==== Check L8504 Continuity ====

* Use a multimeter in continuity mode to check L8504 (Figure 1).
* Normal reading should be close to 0.01.
* If L8504 is blown or burned, proceed to the "L8504 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 L8504 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.

==== L8504 Blown or Visibly Burned ====

* Understand that L8504 failure indicates a catastrophic short within the TCON board of the display or a melted/corroded display cable/connector.
* Repair L8504 only after addressing the display issue, as L8504 might fail again if the display issue persists.
* When replacing L8504, 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.
* Connect jumper wire from the input side of the filter (PP5v_G3S) to R5610 (Figure 2) or a suitable point.
* Apply conformal coating to jumper wire.
* Use a 120 Ohm ferrite filter rated for 1.5 amps (402 package size).
* After replacing L8504 and addressing trace issues, replace the display assembly or repair it by replacing damaged cables/connectors.

==== No Camera Function, L8504 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, U8504 might be faulty, or there could be trace/resistor issues between the camera connector/U8504 or between U8504 and the T2 chip.
* A hardware issue with the T2 chip might also cause camera detection problems.