compaq cq41 dead

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  • lcrcron
    New Member
    • Mar 2011
    • 4

    #1

    compaq cq41 dead

    hi all, I have a compaq cq41 dead, no indicator when power on, led indicator when power adapter plugged also dead.
    anyone have a solution
  • gabik111
    ORD spotter
    • Apr 2011
    • 142
    • USA / Poland

    #2
    Re: compaq cq41 dead

    Did you check power supply? It may be a power jack or power supply.
    Laptops and computers repair.

    Comment

    • mattbrad2
      Senior Member
      • Jan 2011
      • 122

      #3
      Re: compaq cq41 dead

      So you've verified the charger is working properly? Does the charger short or go into protection mode when plugged in to the laptop?

      EDIT: looks like gabik111 beat me to it.

      Comment

      • lcrcron
        New Member
        • Mar 2011
        • 4

        #4
        Re: compaq cq41 dead

        charger works fine on another laptop and the battery works fine too

        Comment

        • kaboom
          "Oh, Grouchy!"
          • Jan 2011
          • 2507
          • USA

          #5
          Re: compaq cq41 dead

          If the DC jack is on its own little PCB, check the jumpers from it to the motherboard for breaks/bad solder. Check power MOSFETs for shorts.

          I had a Samsung 42" LCD TV where the backlight failed. The backlight enable pin to the inverter never was soldered! Just the bare copper via... the terminal's pin loose in it. A friend got it from craigslist cheap, and a little solder later, it was fine.

          -Paul
          "pokemon go... to hell!"

          EOL it...
          Originally posted by shango066
          All style and no substance.
          Originally posted by smashstuff30
          guilty,guilty,guilty,guilty!
          guilty of being cheap-made!

          Comment

          • gabik111
            ORD spotter
            • Apr 2011
            • 142
            • USA / Poland

            #6
            Re: compaq cq41 dead

            So if the battery works you'll need a schematic a remove laptop apart. Then study on diagram and closer look on mobo. Looks like kaboom is right about power transistors on charging/power distribution section.
            Laptops and computers repair.

            Comment

            • nish_pinto
              The Adventurist
              • Oct 2011
              • 83
              • India

              #7
              Re: compaq cq41 dead

              How to check if mosfets are short?
              http://nishantpinto.blogspot.in/

              Comment

              • sasser
                Badcaps Veteran
                • Dec 2012
                • 364
                • Malaysia

                #8
                Re: compaq cq41 dead

                i also had the problem no power compaq CQ41. no light at DC jack light indicator. check power jack got 18.5 its correct. but no power to board and cpu. vccore no value. anyone hav the schematic diagram of compaq cq41? what mosfet hav to check and where to

                Comment

                • opamp
                  Senior Member
                  • Dec 2012
                  • 160
                  • united states

                  #9
                  Re: compaq cq41 dead

                  Actually vcc core voltage will not be present by just plugging in the ac adapter. You should check for 3 and 5 volts Always on first. 3.3 volts should be present on the power button at all times.

                  Comment

                  • sasser
                    Badcaps Veteran
                    • Dec 2012
                    • 364
                    • Malaysia

                    #10
                    Re: compaq cq41 dead

                    oh ok. vccore no present value when pluggin ac adapter and i check power button got 3 volt. what u means "You should check for 3 and 5 volts Always on first" where to check

                    Comment

                    • opamp
                      Senior Member
                      • Dec 2012
                      • 160
                      • united states

                      #11
                      Re: compaq cq41 dead

                      There's a voltage regulator that produces 3 and 5 volts when you connect the power adapter. It's called always on because it should be present without pressing power button. Try and find the schematic so you will have a better understanding how power is distributed. More than likely you have a shorted component. Check mosfets and capacitors out of circuit.

                      Comment

                      • siddiq
                        Senior Member
                        • Dec 2011
                        • 121
                        • Ghana

                        #12
                        Re: compaq cq41 dead

                        Originally posted by sasser
                        oh ok. vccore no present value when pluggin ac adapter and i check power button got 3 volt. what u means "You should check for 3 and 5 volts Always on first" where to check
                        Do you have the schematic? So we can proceed from there.

                        Comment

                        • sasser
                          Badcaps Veteran
                          • Dec 2012
                          • 364
                          • Malaysia

                          #13
                          Re: compaq cq41 dead

                          i dont hav shcematic diagram. already replace ati bga but still no display.that the others thing must chech to determine the gpu is ok or not. some value present at the capacitor below cpu pads?

                          Comment

                          • survey
                            Member
                            • Jan 2013
                            • 16
                            • Portugal

                            #14
                            Re: compaq cq41 dead

                            I have two schematics for this laptop, both from COMPAL: la-4106p and la-4107p
                            Attached Files

                            Comment

                            • madank
                              New Member
                              • Jun 2014
                              • 3
                              • indonesia

                              #15
                              Re: compaq cq41 dead

                              Originally posted by survey
                              I have two schematics for this laptop, both from COMPAL: la-4106p and la-4107p


                              thanks 4 schematic

                              Comment

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