After repairing a TCL 26-inch LCD TV, there are images with sound, but there are shaking white spots on the image, and there are humming noises in the speakers. After the signal is unplugged, the blue background is normal and there is no interference with the white point. The estimated fault is related to DDR. After disassembling, the power supply test DDR W9412G61H-4 2.5V power supply is normal, VREF is also normal! It is estimated that the DDR and the main chip are poorly connected. After the shutdown, the DDR is tested and the RP20522 is excluded. One of them is 157 ohms. Short the resistor directly with a wire and test the machine OK.
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