| Parameter | Details / Expected Values | Repair Notes & Context | | :--- | :--- | :--- | | | 12V (Typical). Measured on pins A13V, Q211, Q400 . | This is the main supply. Its absence suggests a problem upstream on the main power supply or motherboard. | | Core Output Voltages | VCC CORE : 1.8V VDD : 1.9V VDDIO : 3.3V | These are always-on, basic logic voltages. When present, they indicate the IC is receiving power and a basic EN1 (Enable 1) signal. | | Panel Drive Voltages | VGH : 25V - 28V VGL : -5V to -10V HAVDD / AVDD | A failure in one or more of these outputs commonly points to a faulty VPMS2SM, a shorted component on its output line, or a defective LCD panel itself. | | Programming & Control | The VPMS2SM is a digitally programmable device. It is controlled via a standard I2C bus ( SDA, SCL ). It also uses EN1, EN2 , and FB (Feedback) pins for basic operation. | This I2C interface is key for repair. Dedicated programming tools exist (e.g., TJKJ-A1 ) that connect to these lines to directly reprogram the PMIC. |
: Failures in related components often result in "No Image" symptoms due to the absence of critical voltages like on the source board. PCB Design : For engineers, the VPMS2SM datasheet vpms2sm datasheet
The VPMS2SM datasheet provides several typical application circuits, showcasing its versatility in various power management applications: | Parameter | Details / Expected Values |
: The design focuses on minimizing parasitic inductance and capacitance to maintain signal integrity in high-density PCB layouts. IC Components Key Technical Specifications Description Clock Frequencies Its absence suggests a problem upstream on the