MT6351V IC

Product Details
Product Details:

- Part Number: MT6351V (Marking: MT6351V or MT6351V/A)

- Manufacturer: MediaTek Inc. (MTK)

- Target Chipset Platforms: MediaTek Helio P10 (MT6755), Helio P15, Helio X20 (MT6797), Helio X25 (MT6797T)

- Function: Master Power Management Integrated Circuit (PMIC) with Integrated Audio Codec

- Internal Architecture & Subsystems:

* 8 Synchronous Step-Down DC-DC Buck Converters (VCORE, VGPU, VMODEM, VDRAM / LPDDR3 & LPDDR4, VSRAM)

* 31 Low-Dropout Linear Regulators (LDOs dedicated to Cameras, Display, Touch Controller, Sensors, eMMC/UFS, SIM Cards)

* Integrated High-Fidelity Audio Codec (Stereo DAC/ADC, Headphone Amplifier, Speaker Driver)

* High-Precision Fuel Gauge (Coulomb counter for real-time battery capacity and current monitoring)

* 32.768 kHz RTC Crystal Oscillator Driver & Power-On Reset (POR) State Machine

- Package Type: VFBGA-199 (199-ball Fine-Pitch Ball Grid Array)

- Stencil Compatibility: Amaoe MTK / Universal MediaTek PMIC BGA Stencil (0.12mm)

- Mounting Type: Surface Mount Technology (SMD BGA Soldering / Reballing at 183°C)

Usage:

- Core Power Distribution: Converts single-cell Li-ion battery voltage into finely regulated high-current power rails required for multi-core CPUs, GPUs, baseband, and storage systems.

- Target Devices & Compatible Models:

* Xiaomi: Redmi Note 4 (MTK Helio X20 "Nikel"), Redmi Note 4X (MTK version), Xiaomi Redmi Pro (Helio X20 / X25)

* Meizu: Meizu M3 Note (M681H), Meizu Pro 6, Meizu Pro 6s, Meizu MX6

* Oppo: Oppo R9 (MT6755 version), Oppo R9 Plus (select MTK regional variants)

* Motorola / Lenovo: Moto M (XT1662 / XT1663), Lenovo K8 Note / K6 Note (MTK variants)

- Common Fault Symptoms & Motherboard Diagnostics:

* Completely Dead Device (0.00A or 0.01A–0.04A Low Hang): Phone shows no boot activity; on DC bench supply, pressing power key yields 0.00A (broken power sequence/clock) or halts at a static 0.02A (shorted or unpowered secondary LDO rail).

* Auto MediaTek USB Port (BROM Mode): Handset screen stays off, but connecting via USB to PC immediately enumerates as "MediaTek USB Port (COMxx)" because CPU boots into low-level ROM but cannot load software due to unpowered eMMC/UFS or RAM rails.

* Excessive Board Heating & Rapid Battery Drain: MT6351V runs very hot even when phone is in sleep/standby, caused by an internal leakage or shorted VCORE / VGPU buck coil.

* Audio Subsystem Failure: No sound from loudspeaker, earpiece, or mic failure that persists after speaker replacement, caused by burnt analog audio stage inside MT6351V.

* Fake Charging / Inaccurate Percentage: Battery displays charging icon but percentage never increases or phone turns off at 30%–40%, caused by a failed fuel gauge ADC circuit inside the chip.