Konka LCD TV LED40F3300CE lights flash does not boot maintenance - Home Appliances

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A Konka LCD TV model LED40F3300CE was reported to have issues with the power indicator turning on and off, and the program would not start properly. This unit uses a three-in-one motherboard model 35016890. Initial checks showed that the 12V power supply is generally stable, though there is a slight voltage fluctuation, which suggests the power supply itself is likely functioning correctly. The issue seems to be in the load section, where an overcurrent or short circuit might be occurring. Upon measuring the low-voltage power supply area, it was found that the 12V to 5VA line had almost zero resistance to ground. When the system boots up, the 5V rail supplies power to multiple voltage regulator circuits such as 3.3V and 2.5V. However, identifying the exact location of the short circuit was challenging due to the complexity of the board. The best approach in such cases is to perform a "burn test," which involves powering the unit while monitoring for any unusual behavior. Although the specific method isn't repeated here, it's commonly used to isolate faulty components. After testing, it was determined that the fault was caused by a shorted capacitor, specifically C876. Replacing this component resolved the issue, and the TV returned to normal operation.