MacBook Pro A1502 2015-2016 Not turning on (Orange LED and 180 mA current draw) repair
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| MacBook Pro A1502 2015-2016 Not turning on (Orange LED and 180 mA current draw) repair | |
|---|---|
| Device | MacBook Pro A1502 |
| Affects part(s) | Whole board |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
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Problem description
180 mA from the charger, the charger light stays orange and machine does not turn on
Symptoms
- Not turning on.
- Only 180 mA current draw 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).