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Acer Aspire 5335 power problem

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    #1

    Acer Aspire 5335 power problem

    hi
    i have power problem with Acer Aspire 5335
    m.b 0620_08219-SB_4K801
    at first power SW was broken and i found pin8 in spi flash rom (u50) is shorted with GND
    after i changed sio (u39) KB3310QF i found 3.3v on spi rom (u50) pin8 and sw1 pin1,3 put there is no 3.3v and 5v s5 on l20 and l3`
    after replace u37 tps51125 and reprogram bios i found 3.3v on l20 and 5v on l3
    but the machine dont bower on
    i found u39 pin 103 RSMRST#_KBC is 0.9v and SRTCRST# on c73 is 0.7v
    after replace ICH (u16) the machine on OK and display OK but without backlight and without power SW Response (when i remove RTC battery the machine power on automatic, when i put RTC battery and press ws1 the m.b don't power on )
    when i press power SW u39 KBC_PWRBTN# 3.3v then go to 0V, then go back to 3V but pin 101 PM_PWRBTN# is only 3.3v dont go to 0v if i short d21 pin3 with gnd the m.b power on
    d21 pin1,3 is 3.3v dont change with press sw1
    RN74
    pin1 3D3V_AUX_S5 3.3v ok
    pin2 GND
    pin3 BLON_OUT 0v (after power on)
    pin4 KBC_PWRBTN# 3.3v (go to 0V, then go back to 3V when press sw1)


    help please
    Attached Files
    Tags: None
    #2
    Re: Acer Aspire 5335 power problem

    Voltage on D9 all pins?? Voltage on C354?? You said voltage on C73 is 0.7V and that indicates problem with RTC and you need to fix this first. Try removing C73 & C354 one by one and see if you get close to 3V on RTCRST# & SRTCRST#. Btw, RTC cell must be 3V.

    Comment

      #3
      Re: Acer Aspire 5335 power problem

      He already replaced ICH to solve the issue on SRTCRST#.
      If PM_PWRBTN# doesn't drop when KBC_PWRBTN# is triggered it sounds like there's an issue with the EC (bad replacement or not soldered properly maybe). BLON_OUT is also managed by the EC on this board.
      Or if the BIOS was flashed maybe it wasn't the correct file.
      Last edited by piernov; 02-20-2021, 04:59 AM.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

        #4
        Re: Acer Aspire 5335 power problem

        Originally posted by piernov View Post
        He already replaced ICH to solve the issue on SRTCRST#.
        If PM_PWRBTN# doesn't drop when KBC_PWRBTN# is triggered it sounds like there's an issue with the EC (bad replacement or not soldered properly maybe). BLON_OUT is also managed by the EC on this board.
        Or if the BIOS was flashed maybe it wasn't the correct file.
        thanks my friend
        i was replace another IO and resoldered it and change bios file

        Comment

          #5
          Re: Acer Aspire 5335 power problem

          finally i solved it
          BRIGHTNESS problem solved by remove R457 and solder pin2 of it with R241 pin2 with F3 PIN2 (3D3V_S0)
          power press problem solved by remove R8 and connect d21 pin1 to sw1 pin1,3
          thanks for help

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