Konka LC-TM2620 LCD TV black screen check backlight power supply is normal, check PBACK = 0V, it seems that the motherboard has a problem. Check the motherboard CPU for DC-DC: U802 look at the picture
The amount of U802's 3-pin to ground resistance = 0 ohms, check VD802 short circuit, after replacing the new VD802, the screen will be on for about 15 minutes.
Check C814 again, C850 is no problem, after C813, everything is normal.
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