Repair a Konka LC42TS86DC LCD color TV. The fault is automatically turned off after 10 minutes after power-on, and then turned on again. The voltage of the power board is normal, the low voltage of each group of the motherboard is normal. The fault should be related to the motherboard and the shutdown time and the boot time of the machine. It should be the fault caused by the heat of the machine. In order to quickly judge the fault range, the heating method is used, and the main board is heated by the hair dryer. It is found that the fault occurs when the bottom left corner of the main chip is blown, so that the basic locking fault range is good, and the fault is repeatedly checked by the reset. The collector reset voltage SYS RST of the circuit V507 is slowly increased after being heated. The circuit is found to be faulty when the soldering iron is close to the capacitor C488. It is not normal to measure the RST voltage to rise to about 3V. Remove the C488 and heat it with a soldering iron. The post-resistance value is slowly reduced to a breakdown state, but the measurement is normal after cooling, and the 10uF capacitor replacement time is completely eliminated.
Large professional PCB manufacturer in Shenzhen,mainly produce 1-20 layers high precision rigid pcb,and serve the designing,researching and developing.producing and selling for printed circuit boards.
PCB, also known as printed circuit board, is an important electronic component, a support for Electronic Components, and a carrier for electrical interconnection of electronic components.
PCB Board,PCB Factory,PCB Manufacturing Company,Circuit Board Manufacturer,Electronic Service Manufacturer
Huizhou Liandajin Electronic Co., Ltd , https://www.ldjpcb.com