I can't find a way to disappear a noise that Samsung MAX-ZS530 gives me when I connect the power. Use the STK403-040 and two pre one is B1015-Y and the other is a C2026 that they mark as good that is without leakage. It seems you already have it or someone who has it is grateful for your help. It is a noise like when the radio is not tuned, and it does not control volume to the point of damaging the speaker with which I was testing it, I put the earphone on it and at the bottom of the noise I listen to the audio either from the CD or radio or even cassette. This question was asked a year ago and has no answer. Regards.

Good morning, the built-in amplification STK403-040 is effectively damaged, replace it and it was perfect, I made maintenance of the board once solving all those contacts with micro cracks in the weld and that eventually cause failures in the proper functioning of the team. As an additional failure the volume potentiometer did not work well, when increasing or reducing the volume it did not respond, even when climbing it went down and vice versa, I disassembled it from the faceplate, carefully disassembled, clean the excess of factory lubricant I reassembled and ready. Greetings and very grateful.