The Infinix Smart 4 Charging Connector Flex is a vital sub-board component responsible for ensuring stable charging and seamless USB connectivity in the Infinix Smart 4 smartphone (model X653, X653C). Whether your device is facing issues like “not charging,” loose USB connection, microphone malfunction, or unrecognized USB cable, this part acts as a direct OEM replacement that restores factory performance without software modifications or advanced soldering. It combines charging, microphone, vibration motor contact, and antenna functions in one compact PCB unit that sits at the bottom of the phone chassis.
This component is an essential spare for mobile repair technicians and DIY users who want a reliable, tested solution for restoring the phone’s charging and data sync capabilities.
1. Compatibility & Fit
The connector flex board is 100% compatible with Infinix Smart 4 and its common variants including X653 & X653C. It is manufactured according to the original dimensions, screw-hole alignment, and connector layout, ensuring a perfect fit without the need for modification. The flex cable and USB port align precisely with the phone’s mainboard ZIF socket and charging port cut-out, allowing it to install easily into the phone’s lower frame.
Compatible variants:
Infinix Smart 4 X653
Infinix Smart 4 X653C
Dual-SIM and Single-SIM variants
This compatibility makes it a go-to part for phone repair centers handling Infinix models in bulk.
2. Charging Port Features
The board features a Micro USB Type-B port as used in the original factory design. It supports:
5V/2A Fast Charging
Stable data transfer via USB 2.0
OTG (On-The-Go) support for pen drives, keyboards, etc. (if supported by firmware)
The USB port is soldered securely to the board with high-temperature SAC305 solder, which provides strong mechanical support and electrical reliability. It can withstand over 5,000 plug-in cycles without becoming loose or failing.
3. High-Quality PCB Construction
The sub-board is manufactured using FR-4 grade fiberglass PCB material with:
1 oz copper layers for better current flow
RoHS-compliant green solder mask
Pre-bent polyimide flex tail for easy connection to the mainboard
Gold-plated contact pads reduce oxidation and maintain long-term conductivity. The board is ESD protected and tested to ensure reliability under normal environmental conditions, such as high humidity or temperature changes.
4. Integrated Microphone
The flex board comes with an integrated primary microphone, responsible for capturing audio during calls and video recordings. It is an electret condenser mic with:
Sensitivity rating: −42 ± 2 dB
Pre-installed rubber gasket for dust and noise isolation
Grounding lines to minimize static and interference
This ensures clear and crisp voice quality and resolves the common issue of “caller can’t hear me” or muffled audio during calls.
5. Vibrator & Antenna Pads
The connector board also includes:
Gold-plated contacts for the vibration motor
Spring-loaded antenna connectors
These features make this single part capable of restoring multiple bottom-half phone functions in one go — charging, mic, signal reception, and vibration.
6. Electrical Protection & Durability
To protect the device’s internal circuitry, the board includes:
TVS Diode Protection for over-voltage and electrostatic discharge
Reverse polarity protection
Filter capacitors for signal and power stability
These features make the flex board resistant to power surges and short-circuits. The overall durability is enhanced through:
Thermal testing from −20°C to +60°C
Salt-fog resistance for coastal and humid climates
Drop-tested in assembled chassis from 1 meter height
7. Easy Installation Process
Installing the Infinix Smart 4 charging connector flex is a non-soldering process:
Power off the phone and remove the back cover.
Unscrew the speaker chamber and access the lower board.
Disconnect the battery (for safety), and detach the old flex.
Insert the new connector flex and align with mounting points.
Reconnect the flex cable and battery, screw back everything.
Average installation time: 10–15 minutes for technicians.
8. Packaging & After-Sales Support
Every charging connector flex board is:
Packed in anti-static (ESD) sealed bags
Shipped in foam-padded mailers to prevent transit damage
Labeled with batch and QC passed stickers
Retailers and distributors may offer warranty or exchange against manufacturing defects (typically 7–15 days) provided the item is unused and packaging remains intact.
9. Common Issues It Solves
✅ Phone not charging or slow charging ✅ Phone charges only at certain angles ✅ USB not detected on PC ✅ Microphone not working ✅ No vibration or network signal issues (if due to contact failure)
Replacing this part can revive a dead phone without replacing the entire motherboard or phone unit, saving both time and cost.
Conclusion
The Infinix Smart 4 Charging Connector Flex is an essential and cost-effective solution for a wide range of common hardware faults in the device. Whether you are a technician, a mobile phone reseller, or a DIY repair enthusiast, this part delivers the reliability and performance of the original, without needing advanced tools or soldering skills. Its integrated features, electrical protection, and easy installability make it a must-have for your mobile repair toolkit.
Unleash Your Infinix Smart 4’s Potential
The Infinix Smart 4 Charging Connector Flex is designed to enhance your device’s performance and ensure that you stay connected throughout your day. This flex connector is an essential component that facilitates smooth charging and data transfer, allowing you to maximize your smartphone’s capabilities. With a simple yet effective design, this product brings reliability right to your fingertips.
Superior Build Quality
Engineered with durability in mind, the Infinix Smart 4 Charging Connector Flex is made from high-quality materials that withstand daily wear and tear. Its flexible design allows for easy installation without compromising the integrity of your device. Whether you’re charging your phone at home, in the office, or on the move, this connector works seamlessly, providing a stable connection that you can depend on.
Easy Installation and Compatibility
Replacing your Infinix Smart 4 Charging Connector Flex is straightforward, even for those with minimal technical skills. The product is specifically designed to be compatible with the Infinix Smart 4 model, ensuring that you don’t face any compatibility issues. Once in place, it enables optimal charging speeds and allows for quick data transfer. This ensures that you can swiftly sync your files or charge your device without hassle.
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