{"product_id":"stonetaskin-high-quality-for-lenovo-thinkpad-x1-carbon-10th-gen-motherboard-5b21k90412-5b21j13732-i5-1245u-16gb-fully-tested-free-shipping","title":"StoneTaskin High Quality For Lenovo Thinkpad X1 Carbon 10th Gen Motherboard 5B21K90412 5B21J13732 I5-1245U 16GB Fully Tested Free Shipping","description":"\u003cp style=\"margin:0;display: block;width: 100%;\"\u003e\u003cimg referrerpolicy=\"no-referrer\" src=\"https:\/\/wxalbum-10001658-file.dianxiaomi.com\/wxalbum\/164674\/20250306092848\/4478cbcad842ca6101e6fe95e3c32cce.jpg\"\u003e\u003cbr\u003e\n\u003cbr\u003e\n## Product Title\u003cbr\u003e\n\u003cbr\u003e\n**StoneTaskin High Quality For Lenovo ThinkPad X1 Carbon 10th Gen Motherboard – 5B21K90412 5B21J13732 – i5-1245U 16GB – Fully Tested – Free Shipping**\u003cbr\u003e\n\u003cbr\u003e\n---\u003cbr\u003e\n\u003cbr\u003e\n## Short Description\u003cbr\u003e\n\u003cbr\u003e\n\u0026gt; Genuine replacement motherboard for Lenovo ThinkPad X1 Carbon 10th Gen. Model numbers 5B21K90412 \/ 5B21J13732. Intel Core i5-1245U. 16GB RAM soldered. Fully tested. Free shipping. 45-day warranty.\u003cbr\u003e\n\u003cbr\u003e\n---\u003cbr\u003e\n\u003cbr\u003e\n## Key Features (Bullet Points)\u003cbr\u003e\n\u003cbr\u003e\n- ✅ **Designed for ThinkPad X1 Carbon 10th Gen** – Exact fit for Lenovo ThinkPad X1 Carbon Gen 10 laptop.\u003cbr\u003e\n- ✅ **Intel Core i5-1245U Processor** – 12th Gen, 10 cores, 12 threads. Powerful performance for business and productivity.\u003cbr\u003e\n- ✅ **16GB RAM Soldered Onboard** – LPDDR5 memory. Ready to use, no extra RAM purchase needed.\u003cbr\u003e\n- ✅ **Compatible Part Numbers** – Replaces 5B21K90412 and 5B21J13732. Direct match for easy repair.\u003cbr\u003e\n- ✅ **100% Fully Tested** – Every board undergoes power-on, display, keyboard, port, and memory testing before shipping.\u003cbr\u003e\n- ✅ **Free Shipping** – No extra cost. Fast and tracked shipping included.\u003cbr\u003e\n- ✅ **45-Day Warranty** – Buy with confidence. 45-day coverage against defects.\u003cbr\u003e\n\u003cbr\u003e\n---\u003cbr\u003e\n\u003cbr\u003e\n## Product Description\u003cbr\u003e\n\u003cbr\u003e\n**Original Quality Replacement for Lenovo ThinkPad X1 Carbon 10th Gen**\u003cbr\u003e\n\u003cbr\u003e\nIs your ThinkPad X1 Carbon Gen 10 experiencing no power, no display, random freezes, or liquid damage? The StoeTaskin 5B21K90412 \/ 5B21J13732 motherboard is the exact replacement you need.\u003cbr\u003e\n\u003cbr\u003e\nThis motherboard is built to meet original specifications, ensuring a seamless fit into your X1 Carbon Gen 10 chassis.\u003cbr\u003e\n\u003cbr\u003e\n**Core i5-1245U – 12th Gen Performance**\u003cbr\u003e\n\u003cbr\u003e\nThe Intel Core i5-1245U delivers exceptional performance for demanding tasks:\u003cbr\u003e\n- 10 cores (2 P-cores + 8 E-cores) \/ 12 threads\u003cbr\u003e\n- Up to 4.40 GHz Turbo Boost\u003cbr\u003e\n- Intel Iris Xe Graphics\u003cbr\u003e\n- Perfect for Windows 11 Pro, Microsoft Office, video conferencing, coding, and multitasking\u003cbr\u003e\n\u003cbr\u003e\n**16GB LPDDR5 RAM Soldered Onboard**\u003cbr\u003e\n\u003cbr\u003e\nUnlike other boards that require separate RAM, this motherboard comes with 16GB of LPDDR5 memory soldered directly onto the board. No installation needed. Just install the board and power on.\u003cbr\u003e\n\u003cbr\u003e\n**Compatibility Check – PLEASE READ**\u003cbr\u003e\n\u003cbr\u003e\n✅ Laptop Model: Lenovo ThinkPad X1 Carbon Gen 10 (10th Gen)\u003cbr\u003e\n✅ Motherboard Part Numbers: 5B21K90412 \/ 5B21J13732\u003cbr\u003e\n✅ CPU: Intel Core i5-1245U\u003cbr\u003e\n✅ RAM: 16GB LPDDR5 (soldered, included)\u003cbr\u003e\n❌ Not compatible with: ThinkPad X1 Carbon Gen 9 \/ Gen 11 \/ X1 Yoga\u003cbr\u003e\n\u003cbr\u003e\n**What's Included**\u003cbr\u003e\n\u003cbr\u003e\n- 1x Motherboard for Lenovo ThinkPad X1 Carbon 10th Gen (i5-1245U \/ 16GB)\u003cbr\u003e\n- Anti-static bag and secure packaging\u003cbr\u003e\n\u003cbr\u003e\n*Thermal paste, screws, and heatsink\/fan assembly are not included.*\u003cbr\u003e\n\u003cbr\u003e\n---\u003cbr\u003e\n\u003cbr\u003e\n## Shipping \u0026amp; Warranty\u003cbr\u003e\n\u003cbr\u003e\n**Shipping**\u003cbr\u003e\n- Free shipping on this item\u003cbr\u003e\n- Ships within 24-48 hours\u003cbr\u003e\n- Tracked shipping included\u003cbr\u003e\n\u003cbr\u003e\n**Warranty**\u003cbr\u003e\n- 45-day warranty against defects\u003cbr\u003e\n- 30-day return for DOA (Dead on Arrival) – video proof required\u003cbr\u003e\n\u003cbr\u003e\n**Installation Note**\u003cbr\u003e\nThis motherboard requires professional installation or advanced DIY skill. We are not responsible for damage during installation.\u003cbr\u003e\n\u003cbr\u003e\n---\u003cbr\u003e\n\u003cbr\u003e\n## Meta Description (for SEO)\u003cbr\u003e\n\u003cbr\u003e\n\u0026gt; Buy replacement motherboard for Lenovo ThinkPad X1 Carbon 10th Gen. 5B21K90412 5B21J13732. Intel i5-1245U 16GB LPDDR5. Fully tested. Free shipping. 45-day warranty.\u003cbr\u003e\n\u003cbr\u003e\n---\u003cbr\u003e\n\u003cbr\u003e\n## FAQ (Optional – can be added to a separate section)\u003cbr\u003e\n\u003cbr\u003e\n**Q: Does this motherboard come with the CPU and RAM?**\u003cbr\u003e\nA: Yes. The Intel Core i5-1245U and 16GB LPDDR5 RAM are both soldered onboard and included.\u003cbr\u003e\n\u003cbr\u003e\n**Q: Is this compatible with ThinkPad X1 Carbon Gen 9?**\u003cbr\u003e\nA: No. This motherboard is specifically designed for ThinkPad X1 Carbon 10th Gen only.\u003cbr\u003e\n\u003cbr\u003e\n**Q: What is the difference between 5B21K90412 and 5B21J13732?**\u003cbr\u003e\nA: These are different revision or FRU part numbers for the same motherboard platform. Both are compatible with X1 Carbon 10th Gen.\u003cbr\u003e\n\u003cbr\u003e\n**Q: Does the motherboard include the heatsink and fan?**\u003cbr\u003e\nA: No. You will need to reuse your existing heatsink\/fan assembly or purchase separately.\u003cbr\u003e\n\u003cbr\u003e\n**Q: What if the motherboard arrives dead?**\u003cbr\u003e\nA: Contact us within 30 days with video proof. We offer DOA replacement under the 45-day warranty.\u003cbr\u003e\n\u003cbr\u003e\n**Q: Do you offer technical support for installation?**\u003cbr\u003e\nA: We can confirm compatibility, but we do not provide step-by-step installation guidance.\u003cbr\u003e\n\u003c\/p\u003e\u003cdiv\u003e\u003cimg src=\"https:\/\/wxalbum-10001658-file.dianxiaomi.com\/wxalbum\/164674\/20260430095926\/6ff61cb44640c20f11a4d574bfee38cc.jpg\"\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cimg src=\"https:\/\/wxalbum-10001658-file.dianxiaomi.com\/wxalbum\/164674\/20260430095926\/f86130cc474ade7afe19015740412e12.jpg\"\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cimg src=\"https:\/\/wxalbum-10001658-file.dianxiaomi.com\/wxalbum\/164674\/20260430095926\/895d465516ee9e359e7b9813156d2178.jpg\"\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cimg src=\"https:\/\/wxalbum-10001658-file.dianxiaomi.com\/wxalbum\/164674\/20260430095926\/d9a1263d1d3c69f4e2c0c4ca13298bcd.jpg\"\u003e\u003c\/div\u003e\n","brand":"StoneTaskin","offers":[{"title":"Default Title","offer_id":47943563215002,"sku":null,"price":284.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2140\/0715\/files\/6ff61cb44640c20f11a4d574bfee38cc.jpg?v=1777514437","url":"https:\/\/www.stonetaskin.com\/tr\/products\/stonetaskin-high-quality-for-lenovo-thinkpad-x1-carbon-10th-gen-motherboard-5b21k90412-5b21j13732-i5-1245u-16gb-fully-tested-free-shipping","provider":"StoneTaskin","version":"1.0","type":"link"}