Main Board Connector Flex Cable
Samsung Galaxy S25 Main Board Connector Flex Cable Replacement
- Fits
- Samsung Galaxy S25
- Fixes
- Board link faults
- Quality
- Brand new, OEM quality
- Fitting
- Professional install
Overview
What this part is
The Samsung Galaxy S25 uses a flex cable to join the main board to other parts inside the phone. If it is torn, creased or corroded, the phone may stop charging, show no picture, or restart at random, even though the main parts are healthy.
This replacement cable restores that link. It is best fitted by a technician who has already traced the fault to this cable, for example after a drop, liquid damage or a previous repair. It will not fix a faulty main board, battery or screen.
Compatibility
Specifications and compatibility
- Part
- Main Board Connector Flex Cable
- Compatible with
- Samsung Galaxy S25
- Model numbers
- SM-S931B
- Does not fit
- Galaxy S25+, S25 Ultra, S25 Edge, S25 FE or any other model
- Fixes
- Charging, display or power faults caused by a torn, creased or corroded board flex cable
- Does not fix
- A faulty main board, battery, screen or charging port, or software faults
- Quality
- Brand new, OEM-quality main board connector flex cable. Tested before dispatch.
- Brand
- Unbranded, compatible with Samsung Galaxy S25
- In the box
- 1 × main board connector flex cable. Tools and adhesive are not included.
- Colour
- As shown in the photos
- Installation
- Professional installation recommended
- Supplied by
- Supreme Phone Parts Ltd, Manchester, UK
Before you order
Is this the right part?
Signs it needs replacing
- The phone stopped charging after a drop or repair
- The screen stays black or flickers, but the phone rings
- The phone restarts or switches off at random
- The cable is visibly torn, creased or corroded
How to check your model
Open Settings › About phone. The model name should read Galaxy S25 and the model number should be SM-S931B. The model number is also printed on the box.
The Galaxy S25 has a 6.2-inch screen and three rear cameras. The Galaxy S25+ looks similar but is larger, with a 6.7-inch screen.
Professional installation
How a technician fits this part
- Power the Galaxy S25 off, remove the SIM tray and warm the edges of the back glass to soften the adhesive.
- Lift the back glass, remove the screws and covers, and disconnect the battery before anything else.
- Unclip the old flex cable at both ends and ease it out without stressing nearby cables.
- Fit the new cable, press both connectors firmly, reconnect the battery and test charging, display and power before sealing.
- Refit the covers and screws, apply new adhesive and press the back glass down evenly while it cures.
- Run a final check on the Galaxy S25: calls, signal, speakers, buttons, cameras and charging.
Check that the part matches the device before fitting it or removing any adhesive backing. Once a part has been fitted, it cannot be returned for a change of mind. Faulty parts are always covered.
FAQ
Frequently asked questions
Will this fit my Galaxy S25?
Yes, if Settings › About phone shows model number SM-S931B. It does not fit the Galaxy S25+, S25 Ultra, S25 Edge, S25 FE or any other model.
Does it fit the Galaxy S25+?
No. The Galaxy S25+ (SM-S936B) is a larger phone with different internal parts. This part is for the standard Galaxy S25 (SM-S931B) only.
How do I know this cable is the fault?
Look for a torn, creased or corroded cable, or faults that started after a drop or repair. A technician can confirm it by checking the cable and testing the connected parts.
Is it made by Samsung?
No. It is a brand new, OEM-quality main board connector flex cable made to fit the Galaxy S25, and every part is tested before dispatch.
Should I fit it myself?
We recommend professional installation. Opening a Galaxy S25 means heating and lifting the back glass, disconnecting the battery safely and resealing with new adhesive.
How quickly will it arrive?
Orders placed before 4pm on a working day are dispatched the same day from Manchester by Royal Mail Tracked. Delivery is free on UK orders from £5. Returns are accepted within 30 days from receipt.
Prepared by the Supreme Phone Parts team, Manchester. Last updated September 2026.