Repairing a miscellaneous LCD TV, the initial fault is that the indicator light is not turned on, check the power supply 5V is normal, no 12V, after checking for two MOS switch tube breakdown, a 2A insurance open circuit! After the power is repaired, the power is turned on and off, the sound is normal, and the image can be seen faintly, and it is determined to be high voltage protection. Since it is high voltage protection, it starts with its overcurrent, overvoltage, and open circuit protection circuits! After detailed inspection, the D601 and D602 are damaged! The model is A7W25, which was originally thought to be a triode. Later, I found out that the data is not a triode but a double diode! The original identification is not marked with Q, but with D! In the absence of the same type of original, I used four BVA21PH replacement, and the LCD TV was replaced after replacement. 1N4148 has a low withstand voltage and may not be available!
Kitchen Range Hood Motor,Range Hood Motor,Kitchen Range Hood,Range Hood Fan Motor
WUJIANG JINLONG ELECTRIC APPLIANCE CO., LTD , https://www.jinlongmotor.com