Look for "LCD_BL" or "Backlight Driver."
When opening an S9 schematic, you will typically find the board divided into several critical blocks: 1. Power Management (PMIC)
The S9 uses complex power rails. The schematic helps you track and various LDO (Low Dropout) lines. If your S9 isn't charging, the schematic will point you to the U7016 charging IC or the OVP (Over-Voltage Protection) chip. 2. CPU and RAM samsung s9 schematic diagram
The Samsung S9 motherboard uses 01005-sized components, which are barely visible to the naked eye. Using a schematic without a high-quality and a fine-tip soldering station is nearly impossible. Conclusion
If you’re facing "No Service" issues, the RF section of the schematic identifies the Power Amplifier (PA), Transceivers, and Antenna Switches. 4. Display and Touch (LDI) Look for "LCD_BL" or "Backlight Driver
If a line should have 1.8V but shows 0V, you’ve found a "short to ground" or a blown filter. Safety and Precision
The specific capacitance (F), resistance (Ω), and voltage (V) of tiny SMD components. If your S9 isn't charging, the schematic will
To successfully repair an S9 motherboard, you usually need two files:
The wiring diagram showing electrical connections.