Motherboard Connector Flex Cable
Samsung Galaxy S23 Ultra Motherboard Connector Flex Cable Replacement
- Fits
- Samsung Galaxy S23 Ultra
- Fixes
- Board connection faults
- Quality
- Brand new, OEM quality
- Fitting
- Professional install
Overview
What this part is
Inside the Galaxy S23 Ultra, a flat flex cable carries power and signals between the main board and the lower part of the phone. If it is torn, creased or corroded after a drop, a previous repair or liquid damage, the phone may stop charging, lose touch or display, or restart at random.
This part replaces that cable. It is a fault-finding repair: a technician should first check the cable for visible damage, because the same symptoms can come from the charging port, battery or main board itself.
Compatibility
Specifications and compatibility
- Part
- Motherboard Connector Flex Cable
- Compatible with
- Samsung Galaxy S23 Ultra
- Model numbers
- SM-S918B
- Does not fit
- Galaxy S22 Ultra, Galaxy S24 Ultra or any other model
- Fixes
- A torn, creased or corroded main flex cable causing charging, display or power faults
- Does not fix
- Main board chip faults, a dead battery or a broken screen
- Quality
- Brand new, OEM-quality main flex cable made for the Galaxy S23 Ultra. Tested before dispatch.
- Brand
- Unbranded, compatible with Samsung Galaxy S23 Ultra
- In the box
- 1 × Galaxy S23 Ultra motherboard connector flex cable. Tools and adhesive are not included unless shown in the photos.
- 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 will not charge, but a new charging port has not helped
- The screen or touch stops working after a drop or a repair
- Random restarts or shutdowns with no software cause
- The old flex is visibly torn, creased or corroded
How to check your model
Open Settings › About phone. The name should read Galaxy S23 Ultra, and the model number should start SM-S918B (a /DS ending just means dual SIM). The model number is also on the box.
The Galaxy S23 Ultra has a 6.8-inch screen and a built-in S Pen. It looks close to the S22 Ultra and S24 Ultra, but the internal parts differ.
Professional installation
How a technician fits this part
- Back up the phone if you can and power it off.
- Warm the back glass and lift it carefully with a thin pick.
- Remove the cover plates and disconnect the battery first.
- Unclip both ends of the old flex cable and peel it free.
- Lay the new cable in the same route, press both connectors home and reconnect the battery.
- Test charging, display, touch and signal before refitting the covers and back glass.
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 S23 Ultra?
Yes, if Settings › About phone shows Galaxy S23 Ultra with a model number starting SM-S918B. It does not fit the Galaxy S22 Ultra or Galaxy S24 Ultra.
Does it fit the Galaxy S22 Ultra?
No. The Galaxy S22 Ultra has a different internal layout, so the cable length and connectors do not match.
How do I know the main flex is the fault?
Look for tears, creases or corrosion on the cable. If charging or display faults remain after replacing the charging port or screen, the main flex is a common next check.
Is it made by Samsung?
No. It is a brand new, OEM-quality flex cable made to fit the Galaxy S23 Ultra, and every part is tested before dispatch.
Should I fit it myself?
We recommend professional installation. The connectors are small and press-fit, and the battery must be disconnected before you unclip anything.
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.
Prepared by the Supreme Phone Parts team, Manchester. Last updated September 2026.