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Acer Aspire 5252 not turning on, 18v on power button

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    #1

    Acer Aspire 5252 not turning on, 18v on power button

    Hello, i have this board that's giving me trouble. Acer Aspire 5252 UMA with LA-6552P mainboard.

    Original problem was EC shorted. After replacing EC, southbridge was getting very hot. I replaced Southbridge. Nothing getting hot but no power either, and i have 18V on the power button.

    3.3V ALW, 5V ALW and 1.1V ALW are all present. EC crystal is oscillating. EC_RSMRST# is 0.62V, so i suspected maybe the southbridge i put on there is not good. This is the 3rd southbridge i replace, and it came from a board that did turn on. Before i took the SB from it i also cross-swapped EC between both boards and the other board still turned on while this did not.

    Have also tried many BIOS dumps and several chips - no go. Any help appreciated.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!
    Tags: None
    #2
    Re: Acer Aspire 5252 not turning on, 18v on power button

    Also the battery is not charging, orange light not coming on, charger IC does not get enable on pin 3 from EC.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

    Comment

      #3
      Re: Acer Aspire 5252 not turning on, 18v on power button

      This has nothing to do with southbridge, EC is not giving EC_ON command on pin 102. It would be nice if i could find out why.
      Originally posted by PeteS in CA
      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
      A working TV? How boring!

      Comment

        #4
        Re: Acer Aspire 5252 not turning on, 18v on power button

        Annoying one indeed. Apparently the EC doesn't do what it's supposed to. First check soldering, you never know…
        Then check voltage on VCC, AVCC, ECRST# and EC_ON pins of the EC.
        Check the resistances connected to the SPI ROM, check voltage on all its pin. Make sure you flashed it with a good dump.
        I hope this should be enough to get any reaction from the EC.
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

          #5
          Re: Acer Aspire 5252 not turning on, 18v on power button

          Fixed it, resistor between CLK pin of SPI chip and EC was missing. Must have knocked it off at some point.

          However, now the board turns on then back off after a short while, no video signal. This sucks. Some power rails are not starting up, SYSON signal does not go high, it stays at 0.18V. PM_SLP_S3# and PM_SLP_S5# are ok.
          Last edited by Th3_uN1Qu3; 09-08-2017, 07:25 AM.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

          Comment

            #6
            Re: Acer Aspire 5252 not turning on, 18v on power button

            What about SUSP#?
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

              #7
              Re: Acer Aspire 5252 not turning on, 18v on power button

              SUSP# was good. Changed EC (again), actually went back to the other one i had on there. SYSON signal now ok, board powers on and stays on, still no video. Looks like i will have to replace NB as well.
              Originally posted by PeteS in CA
              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
              A working TV? How boring!

              Comment

                #8
                Re: Acer Aspire 5252 not turning on, 18v on power button

                Well, that's an RS880M so it wouldn't be surprising.
                Is it no display or no POST though?
                If no display, check with external, but chances are the nortbridge is bad.
                If no POST, check the usual stuff: CPU VCore and other S0 rails, CPU reset signal and activity on BIOS CS pin. Make sure the CPU and RAM are good and compatible with the board.
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment

                  #9
                  Re: Acer Aspire 5252 not turning on, 18v on power button

                  Have Vcore. Had it before as well, when the SYSON signal was missing. CPU and RAM are the ones that were on it, tried others, no change. No VGA output either. Will replace NB on monday and keep you posted. The donor board that the last southbridge came off has not been reflowed or messed around with in any way, so it should be good.
                  Last edited by Th3_uN1Qu3; 09-08-2017, 10:16 AM.
                  Originally posted by PeteS in CA
                  Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                  A working TV? How boring!

                  Comment

                    #10
                    Re: Acer Aspire 5252 not turning on, 18v on power button

                    Replaced NB, still no go, but that one could well be dead, too. Here's where it gets interesting tho: The sound chip was heating up as well, so i replaced that too, still no dice.

                    Bought another broken laptop today, complete with everything except battery, for about half the price of a working board. The lady who sold it to me told me that her daughter was playing games in bed. Typical.

                    So, i put the original northbridge from the client's laptop on this new board. I did keep track of what chip went where. Surprise: Not working! Again, this board had been never repaired and the original issue was EC shorted out. Then i reballed the northbridge that was initially on this other board, put it back on and lo and behold, it runs.

                    Then i tested the parts that were on the original board on this reballed one. Turns out that on our client's laptop, the RAM is dead too, and the LCD has no backlight. Only the CPU is still working... Not the kind of thing you'd like to see after you've put that many hours (and $$) in it.

                    So, to recap, what's blown on this laptop:
                    SB, NB, EC, ethernet chip, sound chip, charging chip, RAM and LCD.

                    The mention of the ethernet chip being fried should ring a bell to some of you - this has likely been zapped by lightning thru the ethernet port, and here you have the extent of the damage. This one is long past economical repair.
                    Last edited by Th3_uN1Qu3; 09-11-2017, 11:46 AM.
                    Originally posted by PeteS in CA
                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                    A working TV? How boring!

                    Comment

                      #11
                      Re: Acer Aspire 5252 not turning on, 18v on power button

                      haha what a nightmare,trust me i know exactly what you have gone trough,now i suggest a vacation and an icecrem...

                      Comment

                        #12
                        Re: Acer Aspire 5252 not turning on, 18v on power button

                        The inverter is what had failed on the screen (no, it's not the fuse ). I didn't even know there was a model of this laptop with a CCFL screen! It is a 15.6" CCFL screen. Of course, i don't have any compatible inverter, and it is built with a single IC so there's nothing to fix.

                        I fitted the LED screen with the LVDS cable from the laptop i bought. That takes care of that. Then... This laptop came with one hard drive inside with the caddy and everything, and another hard drive alongside it. Well, both HDDs are mechanically damaged. One will lock up before attempting to boot, the other will try to boot Windows 7 which seems to be installed on it, and get stuck.
                        Originally posted by PeteS in CA
                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                        A working TV? How boring!

                        Comment

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