Konka LCD TV LED40F3300DCE backlight lights repeatedly lit out - News - Global IC Trade Starts Here Free Join

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The user sent a Konka LCD TV LED40F3300DCE, the user described the image after the boot is normal. After a while, the image is completely gone. If you get another place to change the motherboard more than 300, I feel that it is expensive to get me here. Open the back cover to measure the backlight bar voltage, one The voltage is 143V, the other voltage is more than 190V, which is obviously high, and then causes protection. Turn off the power supply and measure the backlight power supply voltage sampling resistor R785 R756 resistance. It is found that the R756 resistor is obviously changed. Replace the original R785 with three 390K resistors. R756, boot normally. In order to prevent the same fault from the other backlight power supply, replace the two sampling resistors R738 R793 on the reverse side.

Konka led40f3300dce drawings.pdf