BD9423EFV IC Explained: Pinout, Functions & Protection
BD9423EFV IC PDF Pinout & Diagram In this guide you will get the unique PDF of this IC, and in this article we will understand in detail from the pin configuration and block diagram how it works. In this we will understand the protection and how it works. This IC provides six-channel output and is applicable with clock data, i.e., 12C communication, and is also simple.
Pin 31 Protection Bypass Methods and Risks
Pin 31 Protection Bypass Methods and Risks Usually, technicians operate the circuit by grounding this pin with a 10K resistor. This method is fine for testing, but it is very harmful permanently. It can cause the IC to overheat and even damage it. A ceramic capacitor is grounded on this pin, and this pin turns off all types of protection of the IC. You should diagnose the actual fault.
Simple Communication Method
This IC communicates with the system board in two ways: Simple Communication Method. In this method, the IC has standby pins and PWM, and the third pin is Fail_RST, which is also commonly called BL error. This method is used in old Sony LED TVs. I have observed that in new models, it is connected through clock data. We will discuss this later.
Digital Communication (I²C Clock & Data)
Digital communication is the method of communication of this IC with the system board in new models. In this circuit, the pin numbers of the IC are 16 and 21, respectively. In this, pin number 17 is standby, pin number 18 is DVDD, pin number 19 is SDA, pin number 20 is SCL, and pin number 21 is PWM. In this way, this communication with the system board is done.
How BD9423EFV Boosts Voltage
Let’s talk about how this IC boosts the voltage. In this circuit, a MOSFET, an inductor coil, and a diode work for boost up. The frequency is generated on pin number 5 of this IC, and this pin is connected to the gate pin of the MOSFET. By placing a resistor and a diode in parallel with it, the MOSFET passes this switching through the inductor coil and gives it to the diode connected next to it to convert it to DC.
How Feedback Regulates the IC
It is very important to understand feedback. A voltage divider resistor is connected to the voltage boost line. This feedback keeps the circuit stable on pin 8 of the IC so that the voltage remains within its limits. This pin also manages overvoltage protection. In my own experience, these voltage divider resistors increase their value, and due to this, the circuit does not operate.
Pin Configuration.PDF Preview
Conclusion
BD9423EFV IC PDF Pinout & Diagram In this article, we have covered the special points of this IC. The PDF and images will also be of great help to technician friends. Sony LED TV Repair will continue to publish content containing IC and other circuit diagrams in the same way. If you have any suggestions or questions, then be sure to let us know in the comment box.
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Shaukat Ali has over 30 years of experience in LED TV repair, specializing in chip-level repair work. He is an expert in Sony LED TVs, and also repairs other major brands like Samsung, TCL, Orient, and Haier. His expertise includes display panel faults, motherboard issues, power supply circuits, T-Con, and HDMI faults. Based in Lahore, he shares real-time fault finding cases from daily repair work to help technicians and learners with practical experience.
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