For Samsung Galaxy S21 (SM-G991) Main Motherboard Flex Cable
£4.16 ex VAT · UK VAT-registered company
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Same-day dispatch on orders before 4pm, Mon–Fri
Royal Mail Tracked 48® · dispatched from Manchester
Delivery options
Dates are estimates in working days. Orders after 4pm, at weekends or on bank holidays are dispatched the next working day. Final options and prices are shown at checkout.
Fitting advice
Phone parts are delicate. We recommend fitting by a qualified repair technician.
Test the part before final installation, before any adhesive or seal is applied. Parts with adhesive applied can’t be returned for change of mind.
Returns
You have 30 days from the day you receive your item to request a return. Items must be unused, in the condition and packaging they were supplied in, with proof of purchase.
Please contact us before sending anything back. Return postage is the buyer’s responsibility unless the item is faulty. For faulty or incorrectly described items, we cover return postage in full. Approved refunds go to the payment method you used within 10 business days. Your statutory rights are not affected.
0161 425 8273 · support@etech61.com
Mon–Fri 10am–6pm
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Product details
Everything you need to know
- Fits: Samsung Galaxy S21 (SM-G991)
- Part: Main Motherboard Flex Cable
- Connects: main motherboard to the sub-board
- In the box: 1 × main motherboard flex cable
- Dispatch: Same day from Manchester, UK, on orders before 4:00PM Mon–Fri
- Returns: 30 days on unused items
Product Description
Replace a damaged or faulty main motherboard flex cable on the Samsung Galaxy S21 (SM-G991) with this part. It connects the main motherboard to the sub-board, so a fault here can affect several functions.
The listing links a damaged flex to no power, charging faults, signal problems or intermittent behaviour on the S21. Professional installation is recommended and the flex should be tested before final fitting. It is only the flex cable, so any screws, brackets or other parts you need must be sourced separately.
Key Features & Highlights
Compatibility
- Samsung Galaxy S21 (SM-G991)
Signs Your Flex Cable Needs Replacing
- A function linked to the flex (such as display signal, charging, buttons, signal or sensors) stops working or cuts in and out.
- The fault appears after a drop, liquid exposure or a previous repair.
- The flex is visibly torn, creased or has a damaged connector.
- The problem changes when the phone is pressed or flexed.
- Before replacing, reseat the connectors — a loose connector can cause the same symptoms.
How to Check Your Model Number
On the phone or tablet go to Settings › About phone (or About tablet). The model number starts with SM- (for example SM-A145R). It is also printed on the box the phone came in.
Specifications
- This listing is for the main motherboard flex cable only
- Professional installation is recommended
- Please test before final fitting
- Replacement parts are model-specific — check that your device matches the model shown above before ordering.
- Professional fitting is recommended where the device has to be opened; flex cables and connectors are easily damaged.
- Test the part before sealing the device or applying new adhesive.
- If you are unsure which part you need, contact us with your model number before ordering.
Frequently Asked Questions
What does the S21 main motherboard flex connect?
On the Samsung Galaxy S21 (SM-G991) this flex cable connects the main motherboard to the sub-board.
Which S21 faults can a damaged main motherboard flex cause?
The listing mentions no power, charging faults, signal problems and intermittent behaviour on the S21 when the flex is damaged.
Is anything else supplied with the S21 flex cable?
No. The S21 listing is for the main motherboard flex cable only, so nothing else is included.
Which S21 model number does this suit?
It is listed for the Samsung Galaxy S21, SM-G991. Confirm yours in Settings › About phone.
Do I need a professional to fit the S21 flex?
Professional installation is recommended for the S21 flex, and it should be tested before final fitting.
How quickly will my order be dispatched?
Orders paid before 4:00PM Monday to Friday are dispatched the same day from our Manchester warehouse. Orders placed later, at weekends or on bank holidays go out the next working day.
How much is UK delivery?
Royal Mail Tracked 48 is free on UK orders of £5 or more (£2.49 below that). Royal Mail Special Delivery Guaranteed by 1pm is available at checkout, and you can also collect from our shop at 33 Moulton St, Manchester M8 8FQ.
Can I return it if it is not right?
Yes. You have 30 days from delivery to return an unused item in the condition it was supplied in. Please contact us before sending anything back. Your rights under the Consumer Rights Act 2015 are not affected.
Delivery
Fast, tracked delivery from Manchester
Same-day dispatch
Order and pay before 4pm, Monday to Friday, and it leaves us the same day. Later orders, weekends and bank holidays go out the next working day.
Royal Mail Tracked 48®
Free on UK orders of £5+Tracked to your door. £2.49 on orders under £5.
Special Delivery by 1pm®
From £7.99Guaranteed next working day by 1pm (UK). Choose it at checkout.
International Tracked
£9.99To selected countries in Europe, the US, Canada, Australia and New Zealand. Not available for every part — your options show at checkout.
Local pickup
Collect from 33 Moulton St, Cheetham Hill, Manchester M8 8FQ. Usually ready within 24 hours — we’ll email you when it’s ready.
Returns
30 days to change your mind
- 30 days to request a return, from the day you receive your item
- Item unused, in the condition and packaging it was supplied in, with proof of purchase
- Contact us before sending anything back — unauthorised returns can’t be accepted
- Approved refunds go to the payment method you used within 10 business days
- Test the part before final installation — adhesive applied voids a change-of-mind return
- Return postage is paid by the buyer unless the item is faulty
Your rights: as a UK business we always uphold the Consumer Rights Act 2015 and the Consumer Contracts Regulations 2013. For faulty or incorrectly described items, we cover return postage in full. Read the full refund policy.
Phone repair parts, from a real UK business
E-Tech61 Ltd is a Manchester-based supplier of phone, tablet and tech repair parts to DIY fixers and repair shops across the UK.
- Company
- E-Tech61 Ltd
- Companies House
- 08915335
- VAT number
- GB 209 379 096
- Phone
- 0161 425 8273
- support@etech61.com
- Hours
- Mon–Fri, 10am–6pm