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# OTHER TROUBLESOOTHING
1, Testing the chip and the DEMOD's crystal frequency(Y401 Y701) with a frequency
spectrograph, to make sure it's within ±20PPM(±480HZ)；
2, If there is a heavy mosaic when your STB works, or even NO SIGNAL, please change
the crystal in the TUNER; and if that fails, change the Tuner module directly.
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