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Standard PMIC Voltage Adjustment

Overview

Standard PMICs (Power Management ICs) are DC-DC converter chips with built-in non-volatile memory, widely used in TCON logic boards. These chips are configured via the I2C interface — once saved, the adjusted parameters are written directly to the chip's internal memory for permanent固化 (permanent storage).

Supported Models

VolToolV2 supports over 100 standard PMIC models. For pinouts and connection details, please refer to:

PMIC Pinout & Connection Reference →

All models listed on the reference page have been verified.

How It Works

A standard PMIC contains:

  • DC-DC Converters: Generate VGH (gate positive voltage), VGL (gate negative voltage), VCOM (common voltage), and other rails
  • Register Map: I2C-accessible registers for configuring output voltage, timing, and protection parameters
  • Non-Volatile Memory (MTP/OTP): Stores configuration that loads automatically on power-up

Connection

VolToolV2 supports multiple connection methods for standard PMIC programming:

Use the 2K (left) or 4K (right) interface on the top panel. These interfaces expose I2C signals (SCL, SDA, GND) and can connect to the logic board through the screen cable — allowing debugging while the screen is actively displaying, plug and play.

Method 2: Via Flying-Wire Interface

Use the 5-pin interface on the front panel to directly solder I2C wires. Suitable when the TCON board's screen cable interface does not have I2C communication pins.

Method 3: Via Solder Pad Interface

Use the solder pad interface on the bottom panel. Solder flying wires to connect SCL, SDA, GND to the target PMIC pins. Suitable for long-term debugging or fixed test setups.

Note: Regardless of the connection method used, I2C communication requires a common ground — make sure GND is connected between the tool and the target logic board.

Operation

Read Registers

  1. Select Standard PMIC from the main menu
  2. Choose Read — the tool automatically reads current register values via I2C
  3. The display shows the voltage value corresponding to each register

Adjust Parameters

  1. Rotate the encoder to select the voltage to modify
  2. Press the encoder to enter edit mode
  3. Rotate to adjust the value
  4. Press again to confirm

Save Parameters

  • After adjustment, select Save to write the parameters to the chip's internal memory

Precautions

  • Do not exceed the chip's absolute maximum voltage ratings
  • MTP write cycles are limited — confirm parameters before writing
  • It is recommended to read and record original parameters before making adjustments

Screen Cable Interface Identification

When using the top panel screen cable interfaces, pay attention to the difference between the 2K interface and the 4K interface — do not plug incorrectly:

  • 4K Interface: Power pins on the left, 8 pins total
  • 2K Interface: Power pins on the right, 4 pins total

Incorrect insertion may burn the logic board. Please verify the interface type before connecting.