The Huawei P30 Pro is known for its durable hardware, but DIY repairs, especially screen replacements, can sometimes lead to unexpected issues if not handled carefully. A common scenario involves users purchasing third-party screens and accidentally damaging internal components during disassembly, such as charging-related resistors or solder pads. In this case, a customer’s attempt to replace the screen resulted in a "no charging" problem after the battery connector was improperly removed, causing a critical resistor to fall off and its solder pad to peel. In this article, China Phonefix will walk you through diagnosing the issue, preparing the right tools, and executing a precise repair to restore charging functionality.
I. Problem Diagnosis
Before diving into repairs, confirm the root cause of the "no charging" issue:
.Check Basic Connections: Ensure the charging port is clean and the cable/adapter works with other devices.
.Battery & Charging IC: Since the phone can power on, the battery and mainboard are likely functional; the issue is isolated to the charging circuit.
.Visual Inspection: After disassembly, inspect the area around the battery connector and charging port. In this case, a small surface-mount resistor (marked R1234 on the Huawei P30 Pro schematic) near the battery flex cable was missing, and its solder pad was partially lifted—likely torn off when the battery connector was forced open.
II. Required Repair Tools
To safely repair the damaged resistor and solder pad, gather these tools:
|
Tool Category |
Specific Tools |
|
Disassembly Tools |
Precision screwdriver set (Torx T2, Phillips 000), suction cup, plastic pry tool, heat gun (or hair dryer), tweezers. |
|
Soldering Equipment |
Soldering iron (25-30W with fine tip), solder wire (0.3mm diameter, lead-free), flux paste, desoldering braid. |
|
Cleaning & Protection |
Isopropyl alcohol (90%+), anti-static wristband, magnifying glass (or headlamp), high-temperature tape. |
|
Replacement Parts |
Matching resistor (100Ω, 0402 package—common in Huawei charging circuits), solder mask (optional, for protecting exposed pads). |
III. Step-by-Step Repair Guide
Step 1: Safe Disassembly
.Power off the Huawei P30 Pro and remove the SIM card tray.
.Use a heat gun (set to 80°C) or hair dryer to warm the back glass for 2-3 minutes to soften the adhesive.
.Attach a suction cup to the bottom edge of the back glass, gently pull to create a gap, then insert a plastic pry tool to slice through the adhesive.
.Remove the back glass and disconnect the battery connector first (use tweezers to lift the connector lock) to avoid short circuits.
Step 2: Locate the Damaged Resistor & Solder Pad
.Use a magnifying glass to inspect the area near the battery connector (refer to Huawei P30 Pro service Schematic Diagram for resistor R1234 location—typically near the lower-left corner of the mainboard).
.Identify the missing resistor and check the condition of its two solder pads. In this case, one pad was intact, but the other was lifted and partially torn.
Step 3: Repair the Solder Pad (If Damaged)
.Clean the Area: Apply a small amount of flux to the damaged pad and use a soldering iron with BGA desoldering braid to remove any remaining solder or debris.
.Reinforce the Pad: If the pad is lifted but not fully torn, gently press it down with tweezers while applying low heat (180°C) to reattach it to the mainboard. For a completely torn pad, scrape away a tiny section of the green solder mask nearby to expose the underlying copper trace—this will serve as a new connection point.
Step 4: Replace the Missing Resistor
.Prepare the Resistor: Use tweezers to pick up the replacement 100Ω resistor (0402 package). Apply a tiny dot of flux to the resistor’s terminals.
.Solder the Resistor: Heat the intact solder pad with the soldering iron, then place one end of the resistor onto the pad. Hold for 2-3 seconds until the solder melts, then repeat for the second terminal (or the exposed copper trace, if the pad was repaired).
.Inspect Connections: Use the magnifying glass to ensure no solder bridges exist between adjacent components. Apply a drop of isopropyl alcohol to clean excess flux.
Step 5: Reassembly & Testing
.Reconnect the battery connector, then temporarily power on the phone to test charging: plug in the original charger—if the charging icon appears, the repair is successful.
.Power off again, reattach the back glass with new adhesive, and secure all screws.
.Fully charge the battery to 100% and test charging with multiple Phone Charger Cables/adapters to confirm stability.
IV. Conclusion
DIY screen replacements can save time and money, but improper disassembly,especially around delicate components like battery connectors,often leads to secondary issues like damaged resistors or solder pads. In this Huawei P30 Pro case, the "no charging" problem was resolved by replacing a missing resistor and repairing its torn solder pad, a fix that requires patience and basic soldering skills.
For users without soldering experience, seeking professional phone repair services is recommended to avoid further damage. Always use high-quality tools and follow proper disassembly procedures, gentle handling of flex cables and connectors is key to preventing such issues. With the right approach, even complex charging circuit repairs can be completed efficiently, restoring your device to full functionality.
