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Dead, no power

| Fault | What to look for in the schematic | | :--- | :--- | | | Trace BAT+ (battery positive) to the main fuse (F1000) and to the PMIC. Check diode mode readings on VPH_PWR line. | | Overheating near CPU | Find the VDD_ARM and VDD_SOC power rails. Look for shorted capacitors (e.g., C1104, C1105). | | No SIM card detected | Locate the SIM1_DATA and SIM1_CLK lines from the CPU. Check for broken pull-up resistors (R2501, R2502). |

Power Amplifiers

: Separate PAs manage the amplification of 2G and 3G/4G bands. 3. Display and Backlight Paths vivo y93 schematic diagram download new

• Navigate to the Display Connector (J1801) page.
• Identify the LCD_VDD (2.8V) and LCD_VSN (-5V) lines.
• The schematic will show you that these voltages are generated by the Display PMIC (U1701). If the voltages are missing, check nearby coils (L1701) and capacitors (C1701-C1704) referenced in the diagram.

• Use the diagram to: Locate the battery connector and measure B+ voltage.
• Trace the path: Follow the positive terminal to the charging MOSFET and then to the PMIC (likely MT6357 on this model).
• Key test point: Look for VCC_SYS (typically 3.8V-4.2V). If missing, the PMIC is not receiving power.

specific hardware issue

Are you troubleshooting a , such as a charging failure or a dead screen, that I can help you locate on the diagram? Vivo Y93 Display Light Ways Diagram Clarifying “vivo y93 schematic diagram download new” —