PM6150L
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QUALCOMM PM6150L-103 SECONDARY SYSTEM PMIC COMPREHENSIVE REPAIR GUIDE
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1. PRODUCT IDENTIFICATION & HARDWARE SPECIFICATIONS:
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- Part Number: PM6150L-103 (Package silkscreen laser marking: PM6150L / 103)
- Silicon Manufacturer: Qualcomm Technologies, Inc.
- Chipset Platforms: Snapdragon 675 (SM6150), Snapdragon 720G (SM7125), Snapdragon 730/730G
- Multi-PMIC Power Topology: Secondary Sub-PMIC (Paired directly with Master PMIC: PM6150 / PM6150A)
- Functional Classification: Sub-PMIC / Switched-Mode Battery Charger / Display Bias & Backlight
- Package Configuration: Fine-Pitch Wafer-Level BGA (Ball Grid Array)
- Input Voltage Lines:
* VBUS Input: 5.0V – 9.0V / 12.0V DC (Qualcomm Quick Charge 3.0 / 4.0+ Input)
* VBAT Input: 3.4V – 4.4V DC (Direct battery voltage line)
- Core Power Node Generation:
* VPH_PWR / VSYS Generation: Generates the primary 3.7V – 4.2V system bus feeding Master PM6150 and RF PA.
- Integrated Peripheral Controllers:
* Switched-Mode Battery Charger (SMBB): Programmable constant-current / constant-voltage charging engine.
* LCD Backlight Boost Driver (WLED): Boost converter producing 18V – 35V DC with PWM dimming control.
* Display Bias Charge Pump: Generates +5.0V (VSP) and -5.0V (VSN) panel bias lines.
* Camera Flash / Torch Driver: High-current strobe driver for rear dual-tone LED flash.
* Haptic Motor Driver: Driver circuit for Linear Resonant Actuators (LRA) and ERM vibration motors.
- Thermal & Soldering Parameters:
* Reballing Stencil: Amaoe Qualcomm PM6150 / PM6150L Dedicated Stencil (0.12mm)
* Recommended Solder Alloy: 183°C Leaded Solder Paste (Sn63/Pb37)
* Hot Air Rework Settings: 315°C – 330°C (Airflow: 40% – 50%)
2. CIRCUIT ARCHITECTURE & MULTI-PMIC SYSTEM SYNERGY:
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- Dual-PMIC Functional Division:
* PM6150-102 / 002 (Master): Dedicates all power resources strictly to CPU/GPU cores, LPDDR4X memory,
38.4MHz sleep clock (XO), and system boot sequencing.
* PM6150L-103 (Secondary): Functions as the frontline gateway. It takes 5V VBUS and VBAT, creates the
global VPH_PWR system rail, manages battery charging, and drives display lighting and bias voltages.
- System Handshake & Communications:
* Linked to the Snapdragon application processor and Master PM6150 via the SPMI bidirectional bus.
* Monitors battery thermistor sensing (BATT_THERM), Type-C CC line detection, and charging telemetry.
- Target Compatible Smartphones:
* Xiaomi / Redmi / Poco: Redmi Note 9S, Redmi Note 9 Pro, Redmi Note 9 Pro Max, Poco X2, Poco M2 Pro,
Redmi K30 (4G), Redmi Note 7 Pro
* Samsung: Galaxy A70 (SM-A705), Galaxy A71 (SM-A715), Galaxy A80 (SM-A805)
* Realme / Oppo: Realme 6 Pro, Realme 7 Pro, Realme 8 Pro, Oppo Reno 2, Oppo Reno 3 Pro (4G)
* Vivo: Vivo V15 Pro, Vivo V17 Pro, Vivo X27.
3. COMMON MOTHERBOARD FAULT SYMPTOMS:
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- Completely Dead Phone (No VPH_PWR Rail):
* Internal failure of PM6150L prevents the generation of VPH_PWR from VBAT or VBUS. Without VPH, the
master PM6150 receives 0V, leading to 0.00A current draw and an unresponsive power button.
- Fake Charging / Stuck Charging Current:
* Charging icon is displayed on screen, but current draw on the USB meter remains fixed at 0.00A,
0.10A, or 0.45A without charging the battery (caused by internal buck switch failure or damaged bootstrap cap).
- Display Backlight Failure / Dark Screen (Graphics Working):
* Handset boots normally, makes notification sounds, and graphics are faintly visible under direct torchlight,
but screen backlight does not illuminate (caused by burned boost diode, inductor, or PM6150L backlight driver).
- Blank Screen / Blue Screen (Missing VSP / VSN):
* Backlight turns on but display remains blank or blue due to missing +5V (VSP) or -5V (VSN) bias rails.
- 0Ω Dead Short on VPH_PWR:
* Connecting the motherboard to a DC bench power supply immediately triggers short-circuit protection
(drawing full 3A–5A). Caused by punch-through of the high-side buck MOSFET inside PM6150L.
- Overheating in Standby Mode:
* Motherboard rapidly drains battery even while in sleep mode, and PM6150L gets hot to the touch.
4. STEP-BY-STEP DIAGNOSIS & TROUBLESHOOTING:
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A. Cold Testing (Diode Mode Check):
1. Disconnect battery and USB charging cable completely.
2. Set multimeter to Diode Mode with RED probe connected to ground (GND shield):
- VPH_PWR Main Switching Coil: Normal reading is 350mV – 480mV. If 0.000V, PM6150L is shorted.
- Backlight Anode Output Pin: Normal reading is 450mV – 650mV.
- VSP (+5V) and VSN (-5V) Capacitors: Normal reading is 400mV – 550mV.
- VBUS 5V Input Line: Normal reading is 450mV – 600mV.
3. Check Backlight Boost Diode:
- Forward bias across Schottky diode must read 180mV – 300mV.
- Reverse bias must read OL (Open Loop). If shorted both ways, replace diode and PM6150L.
B. Hot Testing (Live Operating Voltage Verification):
1. Plug in 5V USB charger without battery connected:
- Check VBUS pin at PM6150L: Must read steady 5.0V DC.
- Check VPH_PWR main coil: Must measure 3.7V – 4.1V DC.
2. Connect charged battery and press power button:
- Check VSP and VSN output capacitors: Must generate +5.0V and -5.0V while display is active.
- Check Backlight Anode line: Must ramp up from battery voltage (3.8V) to 18V – 28V DC when
screen lights up. If voltage stays at 3.8V, the backlight boost circuit inside PM6150L is inactive.
5. REWORK, REBALLING & INSTALLATION GUIDELINES:
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- Thermal Shielding & Precautions:
* Cover neighboring CPU/UFS memory packages and heat-sensitive sensors using polyimide (Kapton) tape
and thick aluminum thermal foil.
- Chip Desoldering (Removal):
* Apply premium low-residue BGA tacky flux around PM6150L.
* Set hot air station to 325°C with 45% airflow.
* Apply heat evenly in circular motions. Lift the IC vertically with fine tweezers as soon as solder
balls fully liquefy to prevent tearing delicate motherboard solder pads.
- Pad Cleaning & Reballing:
* Flatten motherboard pads using copper desoldering braid and a soldering iron set to 300°C.
* Clean thoroughly with 99% Isopropyl Alcohol (IPA) and verify under microscope.
* Reball replacement PM6150L with a 0.12mm dedicated stencil using 183°C leaded solder paste.
- Installation:
* Apply a microscope-thin layer of flux on the PCB footprint.
* Align the Pin 1 orientation dot with the motherboard silkscreen white corner marker.
* Heat gently at 310°C until the solder balls melt and surface tension pulls PM6150L into exact
self-alignment. Allow the PCB to cool naturally before testing.
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