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Quick Repair Summary

  • Device: 14-inch MacBook Pro M5 2025
  • Model: A3434
  • Logic board: 820-03637
  • Customer area: Clayton VIC 3168
  • Fault: Water damage, no power
  • Initial USB-C test: Not performed because it was too risky
  • Damage found: Severe corrosion on the underside of the logic board
  • Main repair: Board-level cleaning, short removal and component replacement
  • Extra faults fixed: USB-C power, left-side sound and lid sleep sensor
  • Final result: MacBook fully functional

What We Found

At first glance, the top of the logic board looked quite clean. But when we removed the board from the case, the underside showed severe water damage and corrosion.

This is a common problem with liquid-damaged MacBooks. The damage is not always visible until the board is removed. Liquid can sit underneath the board, under chips and around small components.

That is why simply drying the MacBook or cleaning only the visible side is often not enough.

Why We Did Not Power It On Straight Away

A badly water-damaged MacBook should not always be connected to power immediately.

If there is corrosion or a short circuit on the logic board, powering it on too early can cause extra damage. It can burn components, damage power rails or make data recovery harder.

For this MacBook, we started with:

  • board removal;
  • full inspection;
  • ultrasonic cleaning;
  • short-circuit testing;
  • careful thermal-camera diagnosis.

Only after the major short circuits were removed did we attempt a controlled power-on test.

Hidden Short Circuits Found

After cleaning and testing, we found short circuits on important power lines.

Using safe voltage injection and a thermal camera, we located the hot components causing the shorts. Several damaged parts were removed, and the board was rebuilt with many replacement components.

In total, we replaced:

  • 25 capacitors
  • 5 resistors
  • 2 small IC chips

After this rebuild, the major short circuits were gone.

820-03637 MacBook Pro logic board showing a clean-looking top side while severe corrosion was found on the underside after board removal.
820-03637 MacBook Pro logic board showing a clean-looking top side while severe corrosion was found on the underside after board removal.

USB-C Power Fault Fixed

After the first repair stage, the MacBook still did not start normally. Two USB-C ports showed a repeating power pattern, and one port showed no current draw.

Under the microscope, we found small corrosion under the UF400 / SN2012024 USB-C control chip.

This chip was removed, reballed and reinstalled. After that, the MacBook powered on.

This was the turning point of the repair.

Thermal camera used to locate shorted components on a water-damaged 820-03637 MacBook Pro logic board during voltage injection diagnosis
Thermal camera diagnosis helped locate hot shorted components during controlled voltage injection, allowing the damaged parts to be found safely before full power-on testing

Sound and Lid Sensor Faults Fixed

Once the MacBook could boot, we continued testing every function.

We found that the left-side sound was not working. After further board-level diagnosis, we replaced UR600, UR630 and UR660. Corrosion was found underneath the chips, and the sound issue was fixed after replacement.

We also found the lid angle sensor was not working. When the top case was closed, the MacBook did not go to sleep. After replacing the sensor, the sleep function worked normally again.

Why This Repair Matters

This repair shows why water-damaged MacBooks need careful board-level diagnosis.

The first visible problem was “no power”, but the full repair required several stages:

  1. finding hidden underside corrosion;
  2. cleaning the board before powering it;
  3. removing shorted components;
  4. repairing the USB-C control circuit;
  5. fixing the left-side sound;
  6. fixing the lid sleep sensor;
  7. testing the MacBook again after repair.

A complete repair is not just getting the MacBook to turn on. It also means checking that charging, sound, sensors and normal functions all work properly.

Customer-friendly infographic showing 14-inch MacBook Pro M5 2025 water damage repair from Clayton VIC, including hidden board corrosion, ultrasonic cleaning, short-circuit repair, USB-C repair, sound repair and successful final result.
This infographic explains how a water-damaged 14-inch MacBook Pro M5 from Clayton VIC was repaired at board level, avoiding full logic board replacement and restoring USB-C power, sound and lid sleep function.

Final Result

After full board-level repair:

  • the MacBook powered on normally;
  • USB-C power behaviour was restored;
  • the left-side sound worked again;
  • the lid sleep sensor worked again;
  • the original logic board was saved;
  • the MacBook was fully functional.

This MacBook did not need a full main board replacement.

This repair shows one example of how we help customers recover their Mac instead of replacing it. See more completed Mac repair cases here:
Successful Mac Repair Cases

Need Help With a Water-Damaged MacBook?

If your MacBook has water damage, no power, charging problems, sound issues or has been quoted for a whole logic board replacement, contact IT-Tech Online first.

We provide MacBook water damage repair and logic board repair in Melbourne, including advanced component-level repairs for severe liquid damage.

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