Today, a Sharp LCD LCD-32NX155A indicator light is off and does not turn on. Omni-Directional Antenna, that is, in a horizontal direction on the drawing performance for 360 "uniform radiation, omnidirectional is usually said. Normally lobe width is smaller, the greater the gain. Omni-directional antenna application in communication system in general, the closer range is big, the price is cheap. Gain general under 9 db. Shown below for the omni-directional antenna signal radiation pattern. Omni Directional Antenna for TV,Omni Directinal Wifi,Omni Directinal Outdoor,Omni directinal Indoor,Omni Directional HD Antenna Yetnorson Antenna Co., Ltd. , https://www.xhlantenna.com
Disassemble check insurance is not broken, large filter capacitor has 320V power supply board to supply power to the motherboard 0V, power off online check power supply board to the motherboard power supply capacitors have short circuit at both ends, disconnect the power board and motherboard connection, power supply board without short circuit The motherboard has a short circuit. It is simple, just check the circuit between the power supply and the ground of the motherboard, and remove three chip capacitors. One of the chip capacitors has a short circuit, and the big heart is it. The circuit check circuit was not found. A chip capacitor of the same size (about 500nF) was installed on the other waste boards. The test machine was OK, and the power supply to the motherboard was restored to 12.3V, and the repair was completed. Many components of this machine have no standard number and no standard socket function. Taobao inadvertently saw that the online guide to repair 30 yuan only need to change a small component, it should refer to that patch capacitor. Now I will dedicate my maintenance experience to everyone, thank you for your support!
Power board number: QPWBFG316WJN2
Motherboard number: QPWBNG308WJN2