COURSES TAUGHT BY PROF. VALDENILTON: Basic Electronics Course Level 1 and 2 Online (100% in VIDEO) https://go.hotmart.com/S90922297H?dp=1 Digital LCD/LED TV Repair Course (100% in PDF) https://technologycursos.wixsite.com/... Transformer Winding Course (100% in PDF) https://hotm.art/Curso-de-enrolamento... COURSES TAUGHT BY OTHER TEACHERS: Basic Electronics Course (with a focus on repair) https://hotm.art/Curso-de-eletronica-... Basic Electronics Course (with a general focus) https://hotm.art/Curso-de-eletronica-... Cell Phone Repair Course (version 5.0) https://hotm.art/Conserto-de-celular-top Cell Phone Repair Course Notebook Motherboard https://hotm.art/Conserto-de-placa-ma... Voltage Inverter Manufacturing and Repair Course https://hotm.art/Aprenda-a-fazer-inve... Photovoltaic Solar Energy Course https://hotm.art/Curso-energia-solar-... Complete Digital Marketing Course (from scratch) https://hotm.art/Curso-de-Marketing-D... The notebook has an input circuit responsible for maintaining the supply voltage of the ALWAYS circuit: the DC-IN. In today's class, you will learn how the DC-IN input circuit of a Notebook works. There are several DC-IN circuit architectures but in this class you will learn how two of these architectures work. One of them is with start command and the other with direct start. 1) DC-IN circuit with start command: In this architecture, the Charger IC is responsible for starting the circuit. When it is biased at its AC IN pin, it releases a low-level command at its AC OK pin that depolarizes an N-channel MOSFET, causing it to cut off. The MOSFET now in cut off allows a second N-channel MOSFET to start conducting, creating a current in the resistive divider connected to its drain. The voltage drop produced in the resistor connected to the drain polarizes the gate of the input MOSFET with a voltage lower than its source terminal, causing it to go into saturation, opening the channel and allowing the 19V voltage to pass through its channel. 2) DC-IN circuit with direct start: In this other architecture, the Charger IC is not involved: the start happens directly. When the adapter is connected to the power grid, the input MOSFET of the DC-IN circuit goes into saturation immediately, without the need for a command. This happens because a second transistor connected to its gate goes into conduction immediately, allowing the resistive divider to produce a voltage drop with a value sufficient for its saturation. If there is any harmful event that could harm the DC-IN circuit, the SAFTY PROTECT command cuts off the auxiliary transistor, making the input MOSFET gate voltage equal to the source voltage, also causing it to cut off, turning off the notebook. Conclusion: I hope that, at the end of this class, you will be able to analyze the notebook's DC-IN input circuit with greater safety and quality, to find accurate diagnoses. Hello, I am Professor Valdenilton, Technical Coordinator of the Electronics courses taught by Technology Cursos. I love transforming people's lives through teaching. My goal is to teach people like you to repair the electronic equipment they love, helping in every possible way. INFORMATION: Our Website: https://technologycursos.wix.com/tech... Business Contact: [email protected] Whatsapp Center: (82) 9 8706-9200 (Only by messages or audio)