| MacBook Pro A1708 Not turning on, pulling 0.04A at 20V repair | |
|---|---|
| Device | MacBook Pro A1708 |
| Affects part(s) | Motherboard |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
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Problem description
#incomplete
Symptoms
- Not turning on
- Pulling 40 milliamps (0.04A) at 20V as measured by USB-C meter
Solution
Diagnostic and Repair Steps
Check if PP5V_S4 is missing but not shorted
Corrosion on R1451, need to replace and make a jumper because a pad is missing (PP3V3_S5).
All power rails were present — no shorts but no CPU voltage
Blown R7101 leading to U7100 was found. Hacked in a 10 Ω resistor in its place since the pad was destroyed.
Short to ground on PP1V_S5G
A lot of short to ground around R8060 and those lines are link to the CPU, damn it's repairable ? Check with thermal camera and U7800 is hot (Figure 1). Remove this guy, still short to ground, check all pads, a lot of rails related to the CPU is short, damn not repairable. Try a reflow if you're believer.