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Dell XPS 15 9560 laptop with no sound

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    #1

    Dell XPS 15 9560 laptop with no sound

    I don't know the history on this laptop. However it is in good condition and everything in it seems to be working except the sound. I tried troubleshooting that several ways, assuming it was a software or driver issue, but in the end even in the Dell diagnostics which run outside of Windows there were no tones played when running the audio diagnostics. It is as if the audio output device is completely missing.

    So, I thought maybe the problem was the little audio board (Dell part 5G0HC) that plugs in to the motherboard (Dell part YH90J). Maybe the audio board was dead. So I ordered the $8 board from an eBay seller and put it in the laptop. Still no sound at all. I messaged the eBay seller asking if they tested the board. They didn't answer that question but promptly sent another board to me. I installed that board, too. Still no sound.

    It is possible that both boards are dead but I suspect the cause of no sound might be the result of a deeper issue like maybe the audio board isn't turning on or isn't getting power for some reason. I noticed a bit of a chemical like smell when removing the laptop bottom cover which makes me suspect something is burned up but I could be wrong about that.

    I was able to find a BRD file for the laptop and eventually found a link to download Allegro. I'm a newbie at doing this. This laptop that is nearly perfect except the non-working sound is bugging me. Seems like there should be a way to fix it.

    I found JAUDIO which is the connector for the audio board. Looks like pin 2 is used to enable the board and the signal on pin 2 comes from the 3rd and 5th pins of UA4. It is also connect to UH2.BE21 (the PCH?) and a couple resistors, I think. Maybe I have that backwards. I guess it would make more sense for the PCH to send the enable signal which causes the audio board to turn on and UA4 to do it's thing. Actually, I should probably be looking at what is connected to +3VS_AUDIO. I haven't tried probing the board yet with a multimeter. Do I seem to be on the right track for figuring this out?
    Last edited by TopPop; 11-24-2022, 10:37 PM.
    Tags: None
    #2
    Re: Dell XPS 15 9560 laptop with no sound

    After some probing with a multimeter it looks like UA4 and JAUDIO have the right voltages on their pins. JAUDIO has 3.3V on pin 2 which is for AUD_PWR_EN. JAUDIO 25, 27, 29 was checked and UA4 1, 2, 3, 4, 5, 6, 7 were checked, too. All look OK. Due to my noobness I don't know what else to check and how to check it. Any suggestions?

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      #3
      Re: Dell XPS 15 9560 laptop with no sound

      Link the schematic/boardview here.

      Comment

        #4
        Re: Dell XPS 15 9560 laptop with no sound

        I'm not 100% sure where I got them after digging through search results for too long so I'll just attach them to this reply.
        Attached Files

        Comment

          #5
          Re: Dell XPS 15 9560 laptop with no sound

          UA4,pin 8-9/13-14 voltage
          UA3,pin5 voltage

          Check these 2 points first and if everything seems ok, then proceed to check UA1 Requirements.

          Comment

            #6
            Re: Dell XPS 15 9560 laptop with no sound

            Thanks for giving me some guidance. It is bed time for me and I work tomorrow so I won't get back to this until tomorrow evening. I'll report what I find.

            Comment

              #7
              Re: Dell XPS 15 9560 laptop with no sound

              Originally posted by mcplslg123 View Post
              UA4,pin 8-9/13-14 voltage
              UA3,pin5 voltage

              Check these 2 points first and if everything seems ok, then proceed to check UA1 Requirements.
              UA4
              8 is 3.29V
              9 is 3.29V
              13 is 5.15V
              14 is 5.15V

              UA3
              5 is 0V

              Some observations: UA4 13 and 14 seem to be bridged or nearly bridged by a bit of solder. I haven't done any soldering on this board. The only pin showing any voltages for UA3 is 1 which is at 3.28V. Looks like 5 is supposed to have 1.8VS. I checked for the 1.8V on pin 5 with and without the small audio board that plugs in to JAUDIO. I wasn't sure if that might make a difference. After some more probing around the components involved in 1.8VS I found some resistors were missing, RA79 RA80. At first I thought maybe I found the problem but all three were missing so I became suspicious and double checked my board revision. This is embarrasing.. I have board rev 2.0 and not 1.0 so I've been using the wrong boardview and schematics. My apologies, mcplslg123. Unfortunately I can't find the Rev 2.0 boardview or schematics anywhere.
              Last edited by TopPop; 12-15-2022, 12:05 AM.

              Comment

                #8
                Re: Dell XPS 15 9560 laptop with no sound

                .
                Attached Files
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                  #9
                  Re: Dell XPS 15 9560 laptop with no sound

                  UA4-PIN 8-9 AND 13-14 are together. So no issue there.Voltages are fine.

                  UA3-here lies the problem as pin5 is missing 1.8V. Pin1 is having 3V,pin3 is EN(able) where you must get voltage.Then only it will output 1.8V on pin5.

                  Locate RA77 and check voltage at both ends of this resistor. Pin1 of this resistor is connected to pin1 of UA3 where you are getting voltage. So pin1 of RA77 is very likely 3V. We're interested in RA77,pin2 voltage as this will go to EN pin of UA3.

                  I see 2 probabilities here
                  01.RA77 is missing,corroded or has shifted value. Check whether its 10K or not.
                  02.CA137 may be short or leaky.You can even remove CA137 and see if 3V is available on EN pin of UA3.

                  Since the audio codec is not fully powered,so it wont work as long as we dont solve this part. Seems you are closer to the solution.

                  Goodluck.

                  PS: as@piernov has already notified, components with"@" mark in schematic means its not used-so RA79-80 are not missing. They are simply not used.

                  Comment

                    #10
                    Re: Dell XPS 15 9560 laptop with no sound

                    @piernov Thank you. I see that in my haste I skipped reading some helpful things.

                    Comment

                      #11
                      Re: Dell XPS 15 9560 laptop with no sound

                      @mcplslg123 RA77 is missing from the board. Just as a precaution I double checked and it doesn't have an @ in the schematic.

                      I guess we are going ahead with using the rev 1.0 boardview and schematic. They must be close enough to what we need.

                      CA137 looks OK. Though, I know they can look OK and still be bad. With the resistor gone I can't check if removing CA137 results in the correct voltage. I should probably get a hot air station before trying to remove CA137 or replace RA77 on the board. Looks like I need to order some 10K Ohm 0201 5% tolerance resistors.
                      Last edited by TopPop; 12-15-2022, 12:03 PM.

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                        #12
                        Re: Dell XPS 15 9560 laptop with no sound

                        Seems I was incorrectly focused on the small audio board that connects to JAUDIO. I thought the sound chip was somewhere on that board. However, later after I peeled some black shiny protective tape off the main board I found the Realtek crab chip. It wasn't on the small audio board.

                        Comment

                          #13
                          Re: Dell XPS 15 9560 laptop with no sound

                          Do you change the IC audio?

                          Comment

                            #14
                            Re: Dell XPS 15 9560 laptop with no sound

                            Yes, RA77 must be there on motherboard. Stuff a10K resistor here and probably that will fix the issue.

                            Comment

                              #15
                              Re: Dell XPS 15 9560 laptop with no sound

                              Originally posted by TSUSOLUCIONS View Post
                              Do you change the IC audio?
                              Why it should be changed when even it dont receive all power.

                              Comment

                                #16
                                Re: Dell XPS 15 9560 laptop with no sound

                                @mcplslg123, thank you for your help! I ordered some resistors. I ordered a hot air station, too. I considered trying to replace the resistor with my variable wattage Radioshack iron but I've read they aren't so great for that. I plan to keep learning how to repair boards so getting a beginner hot air station seemed like the way to go. I also need to replace a tiny capacitor on a LA-9941P board so I have two potential laptop repairs.

                                Comment

                                  #17
                                  Re: Dell XPS 15 9560 laptop with no sound

                                  Goodluck bro.

                                  Comment

                                    #18
                                    Re: Dell XPS 15 9560 laptop with no sound

                                    Hey, I just came back to tell you that replacing that one little RA77 resistor completely fixed the laptop!

                                    Comment

                                      #19
                                      Re: Dell XPS 15 9560 laptop with no sound

                                      Good job mate

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