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Asus M509DA no sound - Realtek ALC3251

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    #1

    Asus M509DA no sound - Realtek ALC3251

    Hello,

    I'm diagnosing a board from an Asus M509DA notebook. The unit came in not playing audio. System acts like it plays audio, but there is no sound through the speakers or headphones. (Headphone jack autorecognision works).

    At first my thought was it would be softwareproblem, but that is not the case, so opened up the laptop and there was some smudge / fluid damage arround the ALC3251 chip.

    I cleaned everything, and even replaced the chip with a donor chip. But still no audio.
    I measured the traces from the 4 speaker pins up to the chip, everything seems normal.

    I cannot find a datasheet of the chip.
    Any one have an idea what to test next ?
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    #2
    Re: Asus M509DA no sound - Realtek ALC3251

    I wonder if your case is similar to what we experienced a short while ago.

    See here:

    https://www.badcaps.net/forum/showth...ght=mon2+audio

    The client was from out of town and had the same fault. He showed it to other shops who gave up. We attempted numerous s/w and firmware (bios) upgrades, etc. without success.

    Post the pix of your audio IC but consider to flux the audio IC and reflow it till it 'dances' on the pads. Nudge it a bit with the tweezers to be sure the solder is properly settling on the surface pads.

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      #3
      Re: Asus M509DA no sound - Realtek ALC3251

      Thanks,

      I managed to find and resolve the problem. There was a broken/burned trace on the mainboard.
      As you can see in the picture attached.
      I made a bridge, now the sound is working perfect.
      Attached Files

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        #4
        Re: Asus M509DA no sound - Realtek ALC3251

        Excellent !!
        Attached Files

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          #5
          Re: Asus M509DA no sound - Realtek ALC3251

          Hello, I am the same problem of mon2. How I test the chip?

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            #6
            Re: Asus M509DA no sound - Realtek ALC3251

            Apply flux on the audio ic and reflow it. Careful to not blow off other tiny parts. You can protect them with aluminum foil or kapton (polymide) tape.

            Once the ic is hot, it should naturally move with tweezers. Be gentle on using the tweezers, never force the move else the pads will be ripped off the pcb. Then the chip will move and naturally bounce back. Do this 2-3 times. Allow it to cool and test again.

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              #7
              Re: Asus M509DA no sound - Realtek ALC3251

              Thanks a lot for the advice. But is there no way to test it with a multimeter?

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