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It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.
Your system is encountering a hold down issue. Ussually, this is the absence of signals due to malfunctioning parts particularly in the vertical circuitry.it could Eigther be an IC, transistor or a defective resistor. However, it can sometimes be remedied by simply resoldering the loose components in the circuitry.
Is the popping noise coming from the speakers? If it is, lowering the volume to zero does not stop the popping from the speakers, then you have an audio output failure. If the sound is not from the speakers, you probably have a high voltage leak. If this is the case, are you in a moist environment or using the set near a window??