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Alpine/BMW CM5908 ​slider radio - no audio from front channels

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    Alpine/BMW CM5908 ​slider radio - no audio from front channels

    Hi-

    I had really weak audio from my rear speakers and no audio on my front speakers (with the front right hissing pretty bad). I replaced all of the capacitors on the amp board and the audio out the rear sounds strong now, but no change on the front.

    If I plug the front speakers into the rear speaker outputs, they work fine so I know the speakers themselves and the wiring to the front is still okay. There's still something in the head unit that needs fixing.

    I cleaned up the amp board as there was junk it from the leaked capacitors (mostly the single big one) that I thought may have been effecting the traces, but no change.

    Anyone know what may be up? Is there anything else I need to replace? Or might I have bad traces that need jumping? I feel like I'm so close. I'm handy with a soldiering iron, just short on specific knowledge of this head unit.

    Thanks!

    #2
    Originally posted by vbfronkis View Post

    I cleaned up the amp board as there was junk it from the leaked capacitors (mostly the single big one) that I thought may have been effecting the traces, but no change.
    Well, finding replacement caps would be a start. Also the PCB might have damage. Is that a double or 4 layer board?
    Originally posted by Matt-B
    hey does anyone know anyone who gets upset and makes electronics?

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      #3
      Originally posted by george graves View Post
      Well, finding replacement caps would be a start. Also the PCB might have damage. Is that a double or 4 layer board?
      I replaced all the caps on the amp board already. Not sure how many layers it is - any key give aways? I'm going to go with double, but am not sure.

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        #4
        The first rule of electronics repair is "thou shalt check voltages" - You should have a loow voltage rair for the electronics, and an dule split rail for the amp.
        Originally posted by Matt-B
        hey does anyone know anyone who gets upset and makes electronics?

        Comment

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