AMAOE 1+10P Middle-Layer BGA Reballing Stencil for OnePlus 10 Pro 5G (NE2210/NE2211/NE2213/NE2215/NE2217) – 70x70mm, 0.12mm Strong Magnetic
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AMAOE 1+10P (ONEPLUS 10 PRO 5G) MIDDLE-LAYER BGA REBALLING STENCIL TECHNICAL REWORK MANUAL
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1. ARCHITECTURAL PURPOSE & DUAL-LAYER PCB DESIGN
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The OnePlus 10 Pro 5G (NE2210/NE2211/NE2213/NE2215/NE2217) utilizes a compact, vertically stacked
dual-layer (sandwich) motherboard architecture to maximize internal chassis space for the 5000mAh
dual-cell 80W SuperVOOC battery, Hasselblad triple-camera module, and multi-layer cooling assembly:
* Lower Board (AP / Core Logic Layer): Houses the Qualcomm SM8450 Snapdragon 8 Gen 1 (4nm) SoC,
8GB/12GB LPDDR5 RAM, UFS 3.1 NAND storage, primary PMICs, and display/charging interfaces.
* Upper Board (RF / Modem / Sub-Layer): Houses the Snapdragon X65 5G modem, cellular transceivers,
power amplifiers, Wi-Fi 6 / Bluetooth 5.2 RF front-end, and antenna switching circuitry.
* Middle Interposer Frame (中层): An L-shaped peripheral PCB wall populated with high-density,
multi-row staggered copper interconnect pads bridging power rails, MIPI lines, PCIe/RF signals,
and ground planes between the two stacked PCB halves.
The AMAOE 1+10P (70x70mm, 0.12mm thick) strong-magnetic stencil is laser-cut to match the exact
L-shaped interposer footprint of the OnePlus 10 Pro 5G, with corner and right-edge relief arcs
matching PCB standoffs and mounting bosses.
2. KEY STENCIL ENGINEERING SPECIFICATIONS
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* 0.12mm Calibrated Thickness: Controls exact solder paste volume per aperture so re-stacked board
halves settle to factory Z-height without cold joints (too thin) or inter-pad solder bridges (too thick).
* Strong Magnetic Alloy (强磁性): Locks firmly onto magnetic reballing platforms and base plates,
preventing lateral drift during squeegee passes.
* Diagonal & Perimeter Venting Holes: Precision-drilled alignment and thermal-relief holes prevent
steel warping under direct hot-air reflow.
* Universal Regional Compatibility: Supports NE2210, NE2211, NE2213, NE2215, and NE2217 boards.
3. CRITICAL SIGNALS ROUTED THROUGH THE MIDDLE LAYER
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Cracked, oxidized, or bridged solder joints along the OnePlus 10 Pro middle interposer typically cause:
* Baseband Unknown / No Service / 5G Dropout: Open joints on RFFE clock/data, transceiver IQ lines,
or SIM interface lines bridging the AP board to the RF board.
* No Boot / High Standby Current: Squeezed solder balls shorting VPH_PWR / VDD_MAIN rails to adjacent
ground pads during improper board re-stacking.
* Wi-Fi / Bluetooth Grayed Out: Interrupted PCIe/UART control lines or missing 1.8V/3.3V RF power
rails across the interposer perimeter.
* Camera / Display / SuperVOOC Charging Faults: Broken MIPI, I2C, or dual-cell charging sense lines
routed between the AP logic board and upper-board connectors.
4. STEP-BY-STEP MIDDLE-LAYER REBALLING & RE-STACKING WORKFLOW
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A. BOARD SEPARATION & PAD PREPARATION:
1. Place the OnePlus 10 Pro motherboard onto a dedicated pre-heating platform set to 175°C–190°C.
2. Once the factory middle-layer solder reaches liquidus, lift the upper RF board vertically using
curved ESD tweezers without applying sideways shear force.
3. Sweep both upper and lower interposer rings with a wide knife-edge soldering iron tip (320°C),
low-melt solder (138°C Bi/Sn alloy), and tacky flux to lower residual lead-free solder melting point.
4. Clean all interposer pads thoroughly with 0.8mm/1.0mm desoldering wick and 99.9% Isopropyl
Alcohol (IPA) until every pad is flat and mirror-bright.
B. STENCIL ALIGNMENT & SOLDER PASTE APPLICATION:
1. Seat the lower/middle-layer PCB onto a magnetic reballing fixture or flat silicone pad.
2. Position the AMAOE 1+10P stencil over the board, aligning the L-shaped multi-row perimeter
aperture ring precisely with the PCB copper pads under a stereo microscope.
3. Apply 183°C Sn63/Pb37 (or 158°C/138°C medium-temp) solder paste across the stencil using a
stiff stainless scraper at a 45-degree angle in one smooth pass.
4. Hold the stencil flat and heat evenly with a hot air gun at 260°C–280°C (low airflow, nozzle
~2cm away) until all paste converts into uniform silver solder spheres, OR lift the stencil
vertically first and reflow the printed paste directly on the board.
5. Inspect every perimeter solder ball under the microscope for uniform height and zero bridges.
C. BOARD RE-STACKING (REJOINING):
1. Apply a thin film of no-clean tacky flux along the opposing board's clean interposer pads.
2. Align the upper and lower halves accurately on the pre-heating platform.
3. Heat at 185°C–195°C (matching the chosen solder alloy) until the upper board settles naturally
by surface tension (apply a gentle 1mm nudge with tweezers to confirm self-centering).
4. Allow the board to cool naturally to room temperature before testing with a DC bench power
supply for shorts on VPH_PWR / VDD_MAIN.
5. POST-REWORK VERIFICATION & BENCH DIAGNOSTICS
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* Diode Mode Check: Probe key connector lines (SIM, Display, Hasselblad Triple Camera, 80W Charging,
RF) in diode mode before powering on to verify zero open lines (OL) or dead shorts to ground.
* DC Power Supply Boot Test: Connect to a regulated 4.2V DC bench supply; verify zero pre-boot
leakage current and clean boot current progression.
* Full RF & Connectivity Audit: Confirm 5G/LTE signal registration, Wi-Fi/Bluetooth MAC address
presence, NFC, and 120Hz LTPO2 Fluid AMOLED display output.
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