CPU 불량인데 부팅이 되는 기적?

Summary

In this video, the speaker narrates a frustrating experience with a Galaxy S21 Ultra water damage case that was mishandled, leading to a diagnosis of a 'CPU issue' without proper inspection. The circuit board shows signs of shorts and missing components, including MLCCs, indicating tampering rather than natural corrosion. The speaker meticulously investigates the circuit, revealing that the shorts were due to deliberate removal of components. Despite the challenges, the speaker attempts to repair the damage to recover data, highlighting the importance of expertise in handling such delicate cases. The video emphasizes the significance of honesty in repair assessments and the value of data backup, ending with a reminder to always back up data to avoid loss.

Takeaways

• 😡 The phone was intentionally damaged, not just water damaged.
• 😠 Many components were forcefully removed instead of corroded.
• 😠 MLCCs (capacitors) were torn off indicating a short circuit.
• 😠 The technician lied saying it was a CPU issue without proper inspection.
• 🔍 The problem was traced to the secondary power section.
• 🔍 The shorted part was located using a thermal camera.
• 🧐 Further disassembly showed the circuits were burnt from continued power.
• 🙂 The phone was revived by bypassing the damaged section.
• 😀 Data recovery is still possible if the core components work.
• 💡 Regular backups are critical as phone damage can happen anytime.

Q & A

What was the main issue with the Galaxy S21 Ultra mentioned in the video?

The main issue was that the device had suffered water damage, leading to short circuits on the circuit board, and components like MLCCs were deliberately removed, making it falsely labeled as a CPU issue.

Why was the device incorrectly labeled as having a CPU issue?

The device was mislabeled as having a CPU issue without proper inspection or removal of the CPU, which was misleading since the actual problem was related to short circuits and removed components on the circuit board.

What specific components were mentioned as being removed from the circuit board?

MLCCs (Multi-layer Ceramic Capacitors) were specifically mentioned as being removed from the circuit board.

How did the technician attempt to diagnose the problem with the device?

The technician used a tester to check for short circuits, inspected the device for removed components, and planned to use a DC power supply and a thermal camera to identify the exact problem areas.

What was the outcome of using the thermal camera to find the issue?

The thermal camera did not show any overheating on one side of the device, indicating no issues there. However, on the opposite side, it detected a short circuit near a connector that had been previously noted as missing.

What steps were taken to attempt to fix the device?

The technician cleaned and prepared the affected area, applied flux, and attempted to remove the damaged components. They also planned to replace the damaged parts to resolve the short circuit issue.

What was the technician's stance on handling such repairs?

The technician emphasized the importance of professional diagnosis and repair, suggesting that devices should be taken to reputable places with the right equipment, even if not to their service, to avoid further damage.

What was the ultimate goal of the repair process described in the video?

The ultimate goal was to recover data from the device, rather than a complete repair, by ensuring that the device could at least power on for data extraction.

What caution did the technician offer regarding DIY repairs?

The technician warned that attempting repairs without proper knowledge or tools could lead to further damage, making the device more difficult to recover or repair later.

What advice was given regarding data backup?

The technician stressed the importance of regularly backing up data to prevent loss due to device failure, loss, or accidental deletion, highlighting that it's never an overstatement to back up data multiple times.