Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
Designed for Professional Repairs
The Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21 is expertly crafted for Samsung S21 repairs, ensuring precise alignment during advanced motherboard reballing tasks. This original stencil offers high durability and meets professional repair standards. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
High-Quality Construction
Made from robust materials, this stencil guarantees accuracy and long-lasting performance. Its exact compatibility with Samsung S21 middle layers enables technicians to perform repairs with confidence and efficiency. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
Effortless Application for Perfect Results
Save time and improve repair quality with the Amaoe G991-012 Stencil. Whether you’re replacing, reballing, or refurbishing, this tool ensures reliable results with minimal effort, making it an essential addition to any professional’s toolkit.
The Amaoe G991-012 Middle Layer BGA Reballing Stencil is a precision-engineered tool specifically designed for the intricate repair work required on the Samsung Galaxy S21 series. As smartphones move toward “sandwich” motherboard designs, high-quality stencils have become the backbone of modern micro-soldering. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
Below is a detailed breakdown of its specifications, design philosophy, and technical application. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
Product Overview
The G991-012 is part of Amaoe’s “Original” series, known for utilizing high-grade Japanese steel. This specific stencil is tailored for the middle layer (interposer) of the Samsung S21 logic board. When a device suffers from a drop or thermal stress, the connection between the top and bottom layers of the motherboard can fail; this tool allows technicians to “re-ball” those connection points with surgical accuracy. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
Technical Specifications
| Feature | Specification Detail |
| Model Number | G991-012 |
| Manufacturer | Amaoe (Huimou Technology) |
| Compatibility | Samsung Galaxy S21 / S21+ / S21 Ultra |
| Target Component | Middle Layer / Interposer / Mainboard Frame |
| Material | High-Quality 304 Stainless Steel (imported) |
| Stencil Thickness | 0.12mm (Ultra-thin precision) |
| Hole Type | Square holes with rounded corners (CNC Laser Cut) |
| Heat Resistance | High thermal stability; resists “warping” or “bulging” |
| Surface Finish | Anti-static, polished finish for easy solder paste release |
| Alignment Marks | Laser-etched board outlines for rapid positioning |
Key Design Features
1. Material Integrity
Amaoe uses specialized steel that maintains its shape even when subjected to the high temperatures of a hot air station (typically between 300°C and 350°C during the reballing process). Cheaper stencils often “pop” or bow upward when heated, which causes solder bridges (shorts). The G991-012 is designed to stay flat against the PCB. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
2. Square-Hole Precision
Unlike older circular-hole stencils, the G991-012 features square holes with slightly rounded internal corners. This geometry is intentional:
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Solder Paste Volume: It allows for a more consistent volume of solder paste to be deposited.
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Release Mechanism: It prevents the paste from sticking to the walls of the stencil when you lift it off, ensuring “perfect pyramids” of solder.
3. The 0.12mm Standard
The thickness of 0.12mm is the industry “sweet spot” for Samsung middle layers. If the stencil is too thick, the solder balls will be too large, causing the two halves of the motherboard to sit unevenly. If it’s too thin, the connection may be weak. This specification ensures a factory-level bond. Amaoe G991-012 Middle Layer BGA Reballing Stencil-Original For Samsung S21
Application Workflow
To use the G991-012 effectively, the technician follows a specific “sandwich” repair workflow:
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Desoldering: The S21 motherboard is heated on a pre-heating station to separate the top and bottom layers.
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Cleaning: Old solder is removed using a soldering iron and wick until the pads are flat.
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Positioning: The G991-012 is placed over the middle frame pads. Amaoe’s etched guides help line up the hundreds of tiny pins instantly.
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Paste Application: A high-quality 183°C or 138°C solder paste is spread across the stencil.
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Reflow: Hot air is applied. The square holes guide the molten solder into perfect spheres.
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Re-assembly: The stencil is removed, and the two motherboard halves are joined back together.
Why the “G991-012” Matters for S21 Repairs
The Samsung S21 series uses the Exynos 2100 or Snapdragon 888 chipsets. These chips generate significant heat, and the board density is incredibly high. Using a generic or low-quality stencil increases the risk of “CPU data line” disconnection. The Amaoe G991-012 is engineered specifically to match the thermal expansion coefficient of these specific boards, reducing the margin of error for the technician.
Maintenance Tips
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Cleaning: Always clean the stencil with 99% Isopropyl Alcohol (IPA) immediately after use to prevent solder paste from hardening in the holes.
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Storage: Store flat. Even a microscopic bend in a 0.12mm stencil can ruin its effectiveness.
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Tooling: Use a high-quality, flat-edged spatula for paste application to ensure even distribution across the G991-012’s surface.
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