The 26-inch Skyworth LCD TV color failure phenomenon is sound but the screen is dull.
Overhaul process: Because the sound is normal, the initial judgment of the power supply is basically no problem. According to experience, the eyes lock the high voltage circuit.
The circuit of Skyworth's small-screen LCD TV is simple. There is only one power/high voltage integrated board, and one board with digital, logic, high-frequency head circuit, middle-position, power amplifier, etc., a total of two. As shown below:
The switching power supply is also very simple, only a set of 12V voltage, respectively, is regulated by each voltage regulator circuit and then supplied to a required circuit. Check the high-voltage board two excitation ICs without 12V voltage, follow the positive and negative printed circuit, only see a fuse with the number F01 connected to the 12V terminal, online detection has dozens of K resistance, indicating that the resistor has burned open circuit, For the sake of stability, use a 2A fuse to connect to both ends, boot, and troubleshoot. As shown below:
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