MacBook Pro A1502 Not turning on (80 mA current draw) repair

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Revision as of 13:13, 8 November 2023 by ASRepairs (talk | contribs) (Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==Problem description== <nowiki>#</nowiki>incomplete thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it! ==Symptoms== *Not turning on. *Only drawing 80 mA from the charge port. ==Solution== Corrosion at U5400 current sensing (R5400) circuit PP3V3_SO_HS_COMPUTING. This device makes power for the stages of CPU_VCORE....")
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MacBook Pro A1502 Not turning on (80 mA current draw) repair
Device
Affects part(s)
Needs equipment
Difficulty
Type


Problem description

#incomplete

Example image (Figure 1) -- No image yet. Help expand this page by uploading it!

Symptoms

  • Not turning on.
  • Only drawing 80 mA from the charge port.

Solution

Corrosion at U5400 current sensing (R5400) circuit PP3V3_SO_HS_COMPUTING. This device makes power for the stages of CPU_VCORE. U5400 signals the SMC.

  • Corrosion for U5400 was removed.
  • Jumper wires were added to replace the faulty traces at U5400.
  • U5400 and current sense resister restored.
  • U7400 (Voltage regulator) chip was replaced and surrounding circuitry restored.
  • Backlight circuitry and other areas cleaned up (corrosion).

Example video

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