Samsung Galaxy S24 FE Main Flex

Main Flex for Samsung Galaxy S24 FE: Board-to-Board Link

The main flex for the Samsung Galaxy S24 FE re-establishes data and power interconnection between the main board (motherboard) and the lower charging sub-board. This interconnection flex cable is essential for resolving internal communication faults caused by wear, creases or damage during previous repairs.

Technical Specifications

• Part type: Main interconnection flex
• Compatibility: Samsung Galaxy S24 FE (SM-S721B, SM-S721B/DS)
• Quality: Compatible

When to Replace

• The mobile phone does not charge or charging fails intermittently — confirm the diagnosis.
• The lower microphone or main loudspeaker emits no sound.
• No mobile network signal or lower antenna faults after opening the device.
• Broken, creased or torn tracks on the flex after disassembly.

Notes for the Technician

• Test before applying: connect the part to the device and confirm its operation before securing or gluing it permanently. Thus, if there is any issue, the return or warranty is handled quickly and simply.
• Difficulty: Medium.
• The intervention requires removing the glass back cover and the upper plastic shield with NFC/wireless charging antenna.
• Precisely align the FPC connectors at both ends before pressing, avoiding bending contact pins.
• Always disconnect the battery before handling or installing the flex to prevent short circuits.
• Fixing adhesive for closing the back cover sold separately.

What Distinguishes This Version

This compatible part has been selected to ensure rigorous dimensional replacement and stable FPC contacts. It represents the right choice for technicians looking for an economical and reliable repair without compromising data flow and internal power supply.

Frequently Asked Questions

Is this main flex compatible with other models in the S24 series?
No, the length, pin layout and internal route are exclusive to the Samsung Galaxy S24 FE (SM-S721B).

Does replacing this flex resolve lower microphone faults?
Yes, provided the sub-board and microphone are operational, as this cable transmits the audio signal directly to the motherboard.