19V 4.74A 5.5*2.5mm Power Adapter for Toshiba

19V 4.74A 5.5*2.5mm Power Adapter for Toshiba  

• Causes of power adapter failure: type 1: high output voltage. High output voltage generally comes from the voltage regulator sampling and voltage regulator control circuit. In the closed control loop composed of dc output, sampling resistance, error sampling amplifier such as TL431, optocoupler, power supply control chip and other circuits, any part of the problem will cause the output voltage to rise. The second kind: line fault. Line fault, including power line damage not power, bad contact with the contact port oxidation, etc. Check whether the input line and output line are energized. If there is a line fault, it can be solved by replacing the power cord. The third kind: the insurance burns out or explodes. It mainly checks the rectifier bridge, diodes, switches and the large filter capacitor on 300 volts. Lead to safety burn, blackening, may also be anti-interference circuit problems caused by.

•  It is especially noteworthy that the safety fire caused by the breakdown of the switch tube usually burns out the power control chip and the current detection resistance. Thermistors also burn out easily with insurance. Fourth: the output voltage is too low. The main causes of output voltage depression are: the performance of the switch tube decreases, resulting in the switch tube cannot be normally conducted, so that the internal resistance of the power supply increases and the load capacity decreases; Bad filter capacitor, resulting in poor load capacity of the power supply, a load output voltage will drop; The bad switch transformer not only causes the output voltage to drop, but also causes the switch tube excitation to be insufficient and damages the switch

• Shenzhen Waweis Technology Co., Ltd. is a high-tech enterprise engaged in r&d, production and sales of notebook adapters. Main: switch power supply, power adapter, charger, LED power supply and other products professional production and processing. The products have passed UL, CE, FCC, KC, PSE, SAA, GS and other certifications. The products produced by the company have perfect protection function, stable performance, safe and reliable. With professional r & d, production and sales experience, the company has accumulated strong technical advantages and rich market resources in the field of power adapters. The company is now able to provide a full range of alternative adapters for the world's major brands of notebook computers.

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