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The is a variant of the Nokia 105 (2019) Go to product viewer dialog for this item.
The charging voltage comes from the micro-USB port (J901). The schematic shows Pin 1 (VBUS) goes through a fuse (F900) and then to a Mosfet (Q901). Check for 5V on both sides of the fuse. If 5V is present at the USB but not at the Mosfet, replace F900.
This covers the radio frequency antenna, transceiver, and PA (Power Amplifier). Unless you have an RF microscope and spectrum analyzer, you generally avoid this section. However, the schematic is useful to test the antenna switch for "No Service" faults.
This distinction is crucial for repair technicians. The architecture of the TA-1203 is defined by the chipset. When looking for a schematic, you will often find that the diagram is shared across similar models that use this same platform. The schematic provides the roadmap for how the CPU interacts with the Power Management IC (PMIC), the Flash Memory, the Display, and the SIM card readers.
The is a variant of the Nokia 105 (2019) Go to product viewer dialog for this item.
The charging voltage comes from the micro-USB port (J901). The schematic shows Pin 1 (VBUS) goes through a fuse (F900) and then to a Mosfet (Q901). Check for 5V on both sides of the fuse. If 5V is present at the USB but not at the Mosfet, replace F900.
This covers the radio frequency antenna, transceiver, and PA (Power Amplifier). Unless you have an RF microscope and spectrum analyzer, you generally avoid this section. However, the schematic is useful to test the antenna switch for "No Service" faults.
This distinction is crucial for repair technicians. The architecture of the TA-1203 is defined by the chipset. When looking for a schematic, you will often find that the diagram is shared across similar models that use this same platform. The schematic provides the roadmap for how the CPU interacts with the Power Management IC (PMIC), the Flash Memory, the Display, and the SIM card readers.
