PM6225
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QUALCOMM PM6225 / PM6225-001 PRIMARY SYSTEM PMIC COMPREHENSIVE REPAIR GUIDE
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1. PRODUCT IDENTIFICATION & HARDWARE SPECIFICATIONS:
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- Part Number: PM6225-001 (Laser silkscreen marking on package: PM6225 / 001)
- Silicon Manufacturer: Qualcomm Technologies, Inc.
- Companion SoC Platform: Qualcomm Snapdragon 680 4G (SM6225) & Snapdragon 685 (SM6225-AD)
- Power System Architecture: Single Primary Master PMIC (Highly Integrated Power Architecture)
- Functional Classification: Multi-Phase Buck Converter, Precision LDO, & Power Management IC
- Package Type: Fine-Pitch Wafer-Level BGA (Ball Grid Array)
- Input Voltage Range: VPH_PWR / VBAT (3.4V to 4.4V DC) & VBUS (5V USB Charging Input)
- Integrated Regulated Power Stages:
* High-Efficiency Synchronous Step-Down Buck Regulators:
- VREG_S1 / S2 (Kryo 265 Silver Efficiency Cores): ~0.65V – 0.95V Dynamic Voltage Scaling (DVS)
- VREG_S3 / S4 (Kryo 265 Gold Performance Cores): ~0.75V – 1.15V Dynamic Voltage Scaling (DVS)
- VREG_S5 (LPDDR4X Memory SDRAM VDD_MEM): ~1.125V / 0.6V clean supply
- VREG_S6 (Digital System Logic & Modem Baseband): ~0.75V – 0.90V
* 25+ Low-Dropout (LDO) Regulators:
- Dedicated clean supplies for UFS 2.2 / eMMC 5.1 storage (2.95V / 1.8V), System I/O (1.8V VIO),
Camera analog sensors (AVDD 2.8V, DVDD 1.2V), Display interface, and RF Transceiver.
* Integrated Charging & Peripheral Subsystems:
- Handles USB Type-C input power path, battery charging control, thermal telemetry (BATT_THERM),
and system audio codec integration in specific reference board layouts.
- Thermal & Soldering Guidelines:
* Reballing Stencil: Amaoe Qualcomm SM6225 / PM6225 Dedicated Stencil (0.12mm)
* Recommended Solder Alloy: 183°C Leaded Solder Paste (Sn63/Pb37)
* Hot Air Rework Settings: 315°C – 325°C (Airflow: 40% – 50%)
2. CIRCUIT ARCHITECTURE & MOTHERBOARD ROLE:
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- Master System Power Engine:
* Snapdragon 680/685 platforms predominantly use PM6225 as the single central power supervisor.
* Directly receives battery power (VBAT) and converts it to the global system bus (VPH_PWR).
* Manages the 38.4MHz base sleep clock crystal (XO), initiates hardware reset lines (PON_RESET_N),
and monitors processor handshake confirmation via PS_HOLD (1.8V).
* Senses the PWR_KEY ground trigger and initiates cold-boot sequencing for the application processor.
- Target Compatible Smartphones:
* Xiaomi / Redmi: Redmi Note 11 (4G), Redmi Note 12 (4G), Redmi 10C
* Samsung: Galaxy A23 (SM-A235)
* Oppo / Realme: Oppo Reno 7 (4G), Oppo Reno 8 (4G), Oppo A76, Oppo A96, Oppo A36, Realme 9i, Realme 10
* Vivo: Vivo Y21T, Vivo Y32, Vivo Y33T, Vivo Y35, Vivo T1x
* Honor & Huawei: Honor X7, Honor X8, Huawei Nova 9 SE, Huawei Nova Y90.
3. COMMON MOTHERBOARD FAULT SYMPTOMS:
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- Completely Dead Phone (0.00A Current Draw on DC Power Supply):
* No response when pressing the power button. Caused by fractured BGA solder balls under PM6225 after a
fall, missing 1.8V PWR_KEY voltage, or a defective 38.4MHz crystal oscillator.
- Fixed Low-Current Stuck / Freeze (0.04A – 0.08A Draw):
* When pressing the power key, current jumps to ~50mA–75mA on the DC power supply and locks up
permanently without fluctuating (indicates a missing core buck rail, damaged crystal, or missing PS_HOLD).
- Automatic Qualcomm HS-USB QDLoader 9008 Port:
* Device remains on a blank black screen and connects directly to PC in emergency download mode (EDL 9008)
due to missing or fluctuating UFS 2.2 storage power lines (VREG_L14 / VREG_L19).
- Reboot / Crash When Taking Photos:
* Handset operates normally until the camera app is opened, causing an immediate reboot or freeze due to
voltage droop on camera LDO regulators under high peak current demand.
- Primary VPH_PWR Short Circuit:
* Internal breakdown of PM6225's high-side buck MOSFET pulls the main 4.0V VPH_PWR line to 0V ground,
causing the bench power supply to short-circuit immediately.
4. STEP-BY-STEP DIAGNOSTIC & TROUBLESHOOTING:
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A. Cold Testing (Multimeter Diode Mode Check):
1. Disconnect battery and Type-C cable completely.
2. Select Diode Mode on digital multimeter. Connect RED probe to motherboard GND shield:
- Main VPH_PWR Input Capacitors: Normal reading is 360mV – 480mV.
- VREG_S1 / S2 Coils (CPU Efficiency Cores): Normal reading 70mV – 140mV (naturally low impedance).
- VREG_S3 / S4 Coils (CPU Performance Cores): Normal reading 70mV – 140mV.
- VREG_S5 Coil (LPDDR4X Memory): Normal reading 260mV – 380mV.
- VREG_S6 Coil (Digital Baseband / Core): Normal reading 180mV – 280mV.
- 1.8V VIO System Logic Bypass Caps: Normal reading 380mV – 520mV.
3. Diagnostic Rule: A reading of 0.000V indicates a dead short. If found on core or memory rails, isolate
whether the short is inside PM6225 or the SM6225 CPU using low-voltage DC injection (0.9V – 1.0V)
and thermal imaging or rosin vapor.
B. Hot Testing (Live Operating Voltage Verification):
1. Connect stabilized bench DC power supply at 4.0V to battery terminals.
2. Measure VPH_PWR on filter capacitors surrounding PM6225: Must measure solid 4.0V DC.
3. Check Power Key contact: Must read steady 1.8V DC.
4. Press Power Key and measure voltage on all surrounding buck inductors:
- CPU Core coils must output 0.75V – 0.90V.
- Memory rail (VREG_S5) must output 1.125V.
- System core (VREG_S6) must output 0.80V.
5. Verify PS_HOLD test point: Must rise from 0V to 1.8V and stay locked high. If PS_HOLD drops back
to 0V after 1–2 seconds, inspect the CPU/RAM combo and UFS storage chip.
5. REWORK, REBALLING & INSTALLATION GUIDELINES:
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- Thermal Shielding & Precautions:
* Protect the adjacent Snapdragon 680 CPU and UFS storage chip with polyimide (Kapton) tape and thick
aluminum thermal foil to prevent heat damage or solder ball bridging.
- Chip Desoldering (Removal):
* Apply premium non-corrosive tacky BGA flux around PM6225.
* Set hot air station to 320°C with 45% airflow.
* Move nozzle in smooth concentric circles. As soon as all solder balls liquefy, lift the IC vertically
with precision micro-tweezers. Never force or pry the chip to avoid lifting delicate PCB pads.
- PCB Pad Dressing & Cleaning:
* Flatten solder pads using copper desoldering wick and a chisel-tip soldering iron set to 300°C.
* Clean thoroughly with 99% Isopropyl Alcohol (IPA) and verify under microscope for missing or bridged pads.
- Reballing & Installation:
* Mount PM6225 into a 0.12mm dedicated stencil and apply 183°C leaded solder paste.
* Heat gently at 290°C – 300°C until perfect, uniform solder spheres form.
* Apply a microscope-thin film of flux to motherboard pads, align Pin 1 corner indicator dot with the
silkscreen indicator, and reflow at 310°C until the IC self-aligns. Allow the board to cool naturally.
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