MacBook Pro A1708 Not turning on, pulling 0.02A at 20V repair

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Revision as of 09:21, 27 October 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 *Pulling 20 milliamps at 20V as measured by USB-C meter ==Solution== * Constant low power draw (10–20 mA): Short to ground on power rail (can be PPBUS_G3H, PP3V3_S5, PP3V3_S4,...)...")
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MacBook Pro A1708 Not turning on, pulling 0.02A at 20V 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
  • Pulling 20 milliamps at 20V as measured by USB-C meter

Solution

  • Constant low power draw (10–20 mA): Short to ground on power rail (can be PPBUS_G3H, PP3V3_S5, PP3V3_S4,...)

Example video (19–20 mA draw, 0.7 Ω short to ground on PPBUS_G3H caused by bad capacitor, 1 Ω resistor of current sensing circuit from U7000 (ISL9239) also blown)

  • Missing PP3V3_S5G missing due to missing PM_EN_P3V3S5G, caused by bad (solder of) U7800 (PMIC), or corroded capacitors near it

Example video (Short to ground on PP3V3_S4, PPBUS_G3H 13.7 V, bad capacitor, also damage to USB-C port, replaced CD3215 + other problems) Power cycling 10–30 mA at 20 V: Check for short to ground on PP5V_S4

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