Oppo A5 / A9 2020 Fake Charging FIXED! (Short on DP/DN Line)

Описание: Struggling with your Oppo A5 or A9 (2020) showing "Charging" but the battery percentage doesn't increase? You're not alone! This is a very common issue known as "Fake Charging."

In this detailed repair guide, I walk you through the step-by-step process of diagnosing and fixing this problem on the Oppo A5/A9 2020 motherboard. The root cause was a short circuit on the DN (Data Negative) line of the USB charging port circuit.

🔧 What Was The Problem? The phone would show a charging symbol but would not actually charge the battery.Using a thermal camera and a multimeter, we traced the short to a failed protection diode near the USB port controller. The DP (Data Positive) line was okay, but the DN line was shorted to ground.

✅ The Solution: We successfully removed the faulty protection diode,which eliminated the short circuit entirely. After this micro-soldering repair, the phone began charging perfectly and normally.

⚠️ Important Disclaimer: This is an advanced hardware-level repair.It requires expertise in micro-soldering, the right tools (microscope, soldering station, flux), and a good understanding of motherboard circuitry. If you are not confident, please take your device to a professional repair technician. I am not responsible for any damage you may cause to your device.

⏱️ Timestamps:
0:00- Intro & The Fake Charging Symptom
1:04- Initial Diagnosis with a Multimeter
2:10- Fake Charging Solution in Qualcomm Phone due to DP / DN line short
3:06- Oppo A5 2020 Charging Schematics
6:05- Locating the Faulty Protection Diode
8:41- Testing for Shorts After Removal
10:30- Reassembly & Final Charging Test

📱 Phone Models Affected: This repair is specifically targeted for the:

· Oppo A5 2020 (CPH1931, CPH1951)
· Oppo A9 2020 (CPH1937, CPH1941)
· The logic board and charging circuit are very similar in these models.

🛠️ Tools Used in This Video:

· DC Power Supply
· Digital Multimeter
· Microscope
· Precision Soldering Iron
· High-Quality Flux and Solder

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