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ACER Predator PH317-51 - No +3VALWP

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    #1

    ACER Predator PH317-51 - No +3VALWP

    Hello all,

    today i have an ACER, Board Number C5MMH/C7MMH LA-E911P with missing +3VALWP. i found out, it's because of missing 3V_EN Signal.

    No history known. Comes from a household resolution. Maybe it lies for a longer time. The Adapter wasn't of correct wattage, so i just replaced it with a original one, but unfortunately nothing changed.

    +5VALWP, +3VLP_EC, MAINPWON, EC_ON, EC_RST# and LID_SW# are present. As soon as i press the ON/OFFBTN#, i lost all voltages at EC, except +3VLP_EC. i get the lost voltages back, if i steadily press the ON/OFFBTN#. But if i let go the Button, i lost all voltages again.

    Another thing what happens, if i press the Power-Button: The 3V_EN, SPOK_3V, SPOK_3V5V, +3ALWP and +1VALWP comes out just for an blink of an eye.

    i checked all Coils, all Pins of PU401 and all Pins of EC (UB1) for short. Nothing found.

    What i have done so far (19V missing too at the beginning):

    Replaced DC-IN Mosfets PQ303 & PQ304 (Bad looking solder joints)
    Reflowed Charging Controller PU301 (bad looking solder joints)
    Replaced the 3V Controller PU401 (nothing changed)

    Alle tests done with all Subboards and Coin-Cell connected. I have two Switches at the MB (SW2 & SW3). i believe the're only related to battery, is this correct?

    Now i suspect the SIO itself defective and want to replace it. Any other suggestions? Thank you for assistance!
    Attached Files
    Last edited by Sephir0th; 01-30-2021, 04:59 PM.
    FairRepair on YouTube
    Tags: None
    #2
    Re: ACER Predator PH317-51 - No +3VALWP

    3V_EN_R present??

    Comment

      #3
      Re: ACER Predator PH317-51 - No +3VALWP

      No, unfortunately Not. It's the Same as with 3V_EN. And If you ask: RB14 and RB15 positive checked for correct Resistance. Also checked DB1 and replaced it, Just to be Sure (i forgot to Tell it before). Any Idea?

      I did Something crazy and jumpered DB1 for Testing purpose. +3VALVP/+1VALWP Came Up, but still too Low SPOK_3V Signal. I reverted the Changes, because i don't want to mess Up the Board...
      Last edited by Sephir0th; 01-31-2021, 05:58 AM.
      FairRepair on YouTube

      Comment

        #4
        Re: ACER Predator PH317-51 - No +3VALWP

        Did you removed RB14/15 while jumpering DB1?? If you remove both the resistors, its absolutely safe to jumper db1 for testing purpose.

        Comment

          #5
          Re: ACER Predator PH317-51 - No +3VALWP

          Erm, no... I wasn't Aware of this being important. if you're confirming, i haven't damaged the EC by this Test, I'll try it again today with removing These Resistors and See what Happens. Otherwise i Just wait for the Programmer arriving. Need it anyway, because i have one more Board Here, which has Problems with the EC.

          Greetings
          FairRepair on YouTube

          Comment

            #6
            Re: ACER Predator PH317-51 - No +3VALWP

            Go ahead and try. I use these sort of tricks to solve a lot of problems without changing the IC. Today i fixed a dell 3542 cedar intel mb-it was not trigerring at all though +3/5VALW was present and all start conditions for sio were met. Bios was also good. Problem was TPS51225 powergood pin was releasing 2.2V instead of 3V. I just cut the track towards IC and jumpered PR4534 so that 3V_5V_POK was released....and it worked like a charm. The same case could've been solved by replacing the IC.

            Comment

              #7
              Re: ACER Predator PH317-51 - No +3VALWP

              I Tried it, but wasn't able to establish a high SPOK3V Signal. i replaced the EC and Programmed it succesfully after, but nothing changed...

              In my despair i measured everything around the EC, Maybe Missing "AC_Present" can be a hint? I reprogrammed the BIOS too, Just to be Sure...

              Still nothing. After what i learned so far i never expected to Fail at an 3.3V Coil... But i'm definitely Stuck now...

              My next Steps Would be to replace the DCIN-Mosfets again (didn't replaced it with original spares), the Charging IC (Had Trouble with it at the beginning) and the 3V-Controller the Second time. If it wouldn't Change anything i Would start to replace everything on 3V_EN Rail and Maybe on SPOK_3V Rail too.

              Howewer, i additionally Hope for a good Suggestions.

              The. Charger is original and of correct wattage.

              Ty in advance!
              FairRepair on YouTube

              Comment

                #8
                Re: ACER Predator PH317-51 - No +3VALWP

                I just noticed Someone did some Work at the Charging Connector/Cable before. I was thinking about reversed polarity for a second... But can't be case Here?
                FairRepair on YouTube

                Comment

                  #9
                  Re: ACER Predator PH317-51 - No +3VALWP

                  Meanwhile amongst other things i replaced the EC and Programmed it succesfully. I additionally flashed BIOS with another dump to Check whether it Changes anything.

                  But today i Had some Progress while Checking components at 3V_EN Rail. After desoldering RB15 i was able to start the Board.

                  Now i get the following:

                  - All voltages present except VCCGT (should be okay because MB has dGPU)
                  - GPU- and CPU-Controller have PGOOD
                  - BIOS isn't Posting (CapsLock-Test) and of course No picture
                  - The Fan Starts for a second, then stops, Board does a Reboot after a few Seconds, again the Fans start/Stop and it stays Like this. No Fans, draws 1 Amps and i have to unplug Power before the heatsing getting too hot.

                  What i Tried so far:

                  - flashed original BIOS Back and also an Clean_me version
                  - Tried another RAM
                  -- fully Assembled the Laptop to Check whether it Changes anything.

                  I still suspect the BIOS, so i want to try more dumps and i'll also reflash the EC Just to be Sure.

                  Howewer any Suggestions are Very welcome. Thank you!
                  Last edited by Sephir0th; 02-20-2021, 05:50 PM.
                  FairRepair on YouTube

                  Comment

                    #10
                    Re: ACER Predator PH317-51 - No +3VALWP

                    After getting it to work with all voltages present (except VCC_GT), and flashing around 10 BIOS Roms (but still no POST & Picture) i did some additional Measurements while waiting for EC Programmer (long story!) Everything seems fine for me...

                    LID_SW# 3.265V
                    EC_VCCST_PG 1.018V
                    THERMTRIP# 1.017V
                    H_CPUPWRGD 1.019V

                    PLT_RST# 3.312V jumping for a few seconds, then stable
                    PLT_RST_BUF# 3.309V
                    PLTRST_VGA#_1V8 1.807V
                    +1.8VSDGPU_AON 1.845V
                    GC6_FB_EN1V8# 1.843V
                    GC6_FB_EN3V3 0.000V
                    1VS DGPU_PG 3.171V
                    1.35VS_DGPU_PG 3.307V
                    ALL_GPWRGD 1.808V

                    except this one here:

                    VR_HOT# 0.049V

                    These weird PROCHOT things... howewer, when i desolder RB19, i have 1.020V at VR_HOT# and clarified, the low signal comes from the EC Pin 103 - VCOUT1_PROCHOT ( 0.000V). But i have no idea why i have a LOW there...
                    Maybe it is related to ADP_I Circuit? Did some measurements there too:

                    VCIN0_PH 2.831V
                    VCIN1_ADP_PROCHOT 0.323V
                    ADP_I 0.950V

                    PH201 reads in-circuit 22K Ohms instead of 100K Ohms.

                    Maybe someone can break down this or could this all be meaningless?
                    Last edited by Sephir0th; 02-22-2021, 06:08 AM.
                    FairRepair on YouTube

                    Comment

                      #11
                      Re: ACER Predator PH317-51 - No +3VALWP

                      I Replaced the EC one more time just to be Sure, but this don't Changed anything in the behaviour.

                      I additionally noticed the PCH got really warm, so i can't Touch it with the outside of my Fingers for longer as 2 Seconds. Checking voltages there don't give me any hint, except +1.0VALW_MPHY which isn't Coming Out, but resistances is around 50 Ohms, so seems to be normal.

                      Howewer i suspect more and more an dead PCH. In this Case i should have to give Up on this Point.

                      I Just want to say thank you for your Patience and your Help on this hard Case.

                      Kind regards
                      FairRepair on YouTube

                      Comment

                        #12
                        Re: ACER Predator PH317-51 - No +3VALWP

                        This thread is almost 5 months old, but i still don't want to give Up on this one...

                        The Missing +1.0VALW_MPHY wasn't Missing in the end. Just a wrong measurement.

                        So again i did Spend some time on this Board the Last few days and Had some progress while Measuring and working around on this Board.

                        I've found a Bad Dual Mosfet ( QK1 ) related to the Touchpad and now the board draws a Bit more Amps and also the Fans staying at full Speed since then.

                        Additionally i found Out, DDR_DRAMRST# is missing and PM_SLP_S0# really low (~0.4V) but No short there. This is Very weird in my opinion because all voltages and also Signals Like PLT_RST# are present.

                        Of course i've Tested with Known working RAM.

                        Maybe Someone can explain why and hopefully has some ideas what to suspect now.

                        Thanks again!
                        Last edited by Sephir0th; 06-13-2021, 03:36 PM.
                        FairRepair on YouTube

                        Comment

                          #13
                          Re: ACER Predator PH317-51 - No +3VALWP

                          test voltage and resistance on PU501 pins 5,16,20
                          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                          Comment

                            #14
                            Re: ACER Predator PH317-51 - No +3VALWP

                            Unfortunately everything normal there and Q7 not present if this would be the next question.

                            After you have pointed for me out where to measure i noticed too, that S0 should be present when VTT is also present (regarding the small table at page 45 lower left. Weird.

                            Pin 5 - VDDQ - 1.219V - 111 Ohms
                            Pin 16 - PHASE - 1.219V - 113 Ohms
                            Pin 20 - VTT - 0.607V 1.2KOhms

                            So we are back into the direction of bad PCH...? Any ideas left?
                            FairRepair on YouTube

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