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aspire 3 a315 motherboard la-h782p no display

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    aspire 3 a315 motherboard la-h782p no display

    hello community
    i have an acer aspire a315 motherboard la-h782p its power on but no display ,i have flashed bios,change the ram no issue
    Last edited by SMDFlea; 09-13-2021, 03:22 PM. Reason: added "a315 motherboard la-h782p" to thread title

    #2
    Re: aspire 3 a315 motherboard la-h782p no display

    Can you measure the current draw of the entire board? (with battery disconnected). Does it stay static? Make sure the little switch on PCB that acers are known for is pressed in. Sometimes they won't turn on at all or turn on fully without the switch being closed properly.

    Did you try to plug in external monitor through HDMI with LVDS/eDP cable disconnected?
    Last edited by FrozenHaxor; 09-13-2021, 05:59 PM.

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      #3
      Re: aspire 3 a315 motherboard la-h782p no display

      tanks for reply,the current consumption remains static 120ma without battery in when I stay press the switch button on motherboard the fan turns fully,the laptop,I heard talk about onboard ram disable,if someone can inform us on this topic,tanks

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        #4
        Re: aspire 3 a315 motherboard la-h782p no display

        At 120mA consumption, lot of rails are not generated. Check what is missing on big grey coils after poweron and then proceed further.

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          #5
          Re: aspire 3 a315 motherboard la-h782p no display

          Is the 120mA when the board is turned on or when it remains off?

          What's the standby current?

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            #6
            Re: aspire 3 a315 motherboard la-h782p no display

            voltages on coil:
            pl502:5.1v
            plb2:0.216v
            plm1:1.2v
            pl302:3.3v
            plf1:1.0v
            pla1:0v
            plz1:0v
            plg1:0v

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              #7
              Re: aspire 3 a315 motherboard la-h782p no display

              i don't have schematic for this model but i suggest that no communication with bios chip(no wave on oscilloscope)

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                #8
                Re: aspire 3 a315 motherboard la-h782p no display

                Check PLB2 COIL. Voltage at 0.216V is weird. Find the controller associated with this coil and try to find datasheet for that controller and check the requirement of that controller.

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                  #9
                  Re: aspire 3 a315 motherboard la-h782p no display

                  plb2 coming from BQ25781 pin 27 (phase) and mosfet nchanel source pin,drain pin have 19v

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                    #10
                    Re: aspire 3 a315 motherboard la-h782p no display

                    sorry this line is from +Battery

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                      #11
                      Re: aspire 3 a315 motherboard la-h782p no display

                      I have doubts about the bios I will post the dump if someone can fix it

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                        #12
                        Re: aspire 3 a315 motherboard la-h782p no display

                        plb2 voltage is ok as its associated with charging IC. No harm in trying bios flash.

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