For Samsung Galaxy S21 Ultra 5G G998 Replacement Mainboard Flex The Repair Plus
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Discount applies at checkout on any mix of parts — ideal for repair shops.
Estimated delivery · Royal Mail Tracked 482–3 working days
- Order placedToday
- DispatchedSame day
- At your door2–3 days
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Phone parts are delicate. We recommend fitting by a qualified repair technician — damage caused during fitting is not a product fault. Need help choosing the right part? Call 07425 443625 or email info@therepairplus.com (Mon–Fri 10:00–18:00). Repair shop? Open a trade account.
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The Repair Plus main board connection flex cable for Samsung Galaxy S21 Ultra 5G G998 replaces the ribbon that links the main board to the lower sub-board in the S21 Ultra 5G (G998B). It is brand new, OEM standard, tested before dispatch and shipped the same day from Manchester when you order before 4pm, Monday to Friday.
Key features
- Built for the S21 Ultra: correct length for the larger G998 chassis.
- Reconnects the lower board: charging, audio and antenna signals restored.
- Press-fit connectors: no soldering needed.
- Tested before dispatch: every flex is checked before it leaves us.
- Low-cost repair: fix several faults with one small part.
Specifications
| Part | Main board to sub-board connection flex cable |
|---|---|
| Compatible model(s) | Samsung Galaxy S21 Ultra 5G (G998B) |
| Condition | Brand new |
| Quality | OEM standard |
| Dispatch | Same day before 4pm, Monday to Friday, from Manchester, UK |
| Returns | 30 days |
Compatibility
Fits the Samsung Galaxy S21 Ultra 5G G998B only. It does not fit the S21 (G991) or S21 Plus (G996). Check your model number in Settings > About phone before ordering.
Is the main board flex the cause of your fault?
This flex links the main board of the Galaxy S21 Ultra 5G to the lower sub-board, so a torn or pinched cable can cause several faults at once: charging not detected, a silent loudspeaker or microphone, and weak or lost signal. If more than one of these started after a drop or a previous repair, the flex is a likely suspect. If only charging has failed, check the charging port first, as a blocked or worn port is a more common cause.
To fit it, remove the back glass and mid-frame cover, disconnect the battery, then unclip both ends of the old flex. Press the new connectors on squarely until they click, and test charging, sound and signal before resealing.
Why buy from The Repair Plus
- Same-day dispatch when you order before 4pm, Monday to Friday.
- UK stock, shipped from Manchester.
- Every part tested before dispatch.
- 30-day returns.
- Trusted by DIY repairers and independent repair shops.
Frequently asked questions
Will this fit the S21 Plus?
No. This mainboard flex is for the S21 Ultra 5G G998 only.
Could this flex cause weak signal on my S21 Ultra?
Yes. Antenna signals pass through this link, so a damaged flex can reduce signal.
Is it the same as the S20 Ultra flex?
No. The S20 Ultra and S21 Ultra use different flex cables.
How fast is dispatch?
Same day for orders before 4pm, Monday to Friday.
