Good afternoon dear, I will comment, I do not have much experience with audio equipment, and they brought me a Philips HTS3510 home that when the power light is plugged on and off intermittently and a noise is heard on the source board. Check the source and apparently everything is fine, the diodes, capacitors, resistors ... even so when I breath the source alone I still hear the intermittent sound as if it were a relay opening and closing but under a trap (see in pictures) I can't find information about this component .. Anyone have any idea what it can be? I measured the voltage outputs and they are all ok, but when I connect the other plates the noise gets louder. replace the two components Q0170 and Q1565 Even so, I don't find the problem. Grateful for any comments. Cheers !

did you solve it? I have exactly the same problem.