Alienware M14x R2 with 7 beeps error

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  • Johndill
    Badcaps Veteran
    • Aug 2015
    • 314
    • Australia

    #121
    Re: Alienware M14x R2 with 7 beeps error

    Originally posted by caspian
    just measure voltage on each side separately.
    I measured them when they where bridged and they had 5.12V across them.
    Last edited by Johndill; 09-22-2017, 04:41 AM.

    Comment

    • dellxps15
      Badcaps Legend
      • Feb 2014
      • 1585
      • italy

      #122
      Re: Alienware M14x R2 with 7 beeps error

      Originally posted by Johndill
      I measured them when they where bridged and they had 5.12V across them.
      when there was solder on them ( bridged) u got 5 volts ?

      if so:

      voltage on q26 pin 4 ?
      R270 is 102k ?

      Comment

      • Johndill
        Badcaps Veteran
        • Aug 2015
        • 314
        • Australia

        #123
        Re: Alienware M14x R2 with 7 beeps error

        Originally posted by dellxps15
        when there was solder on them ( bridged) u got 5 volts ?

        if so:

        voltage on q26 pin 4 ?
        R270 is 102k ?
        5.12V when bridged.

        Q26 pin 4 is in post 110, will have to test R270 when I have some more free time.

        Comment

        • dellxps15
          Badcaps Legend
          • Feb 2014
          • 1585
          • italy

          #124
          Re: Alienware M14x R2 with 7 beeps error

          r270 should be the one near pq206 mark. check value (without power ofcourse) and also voltage both side of that resistorwhen powered on.

          Comment

          • Johndill
            Badcaps Veteran
            • Aug 2015
            • 314
            • Australia

            #125
            Re: Alienware M14x R2 with 7 beeps error

            Originally posted by dellxps15
            r270 should be the one near pq206 mark. check value (without power ofcourse) and also voltage both side of that resistorwhen powered on.
            39.3 k ohms across R270
            37.4 k ohms pin1 to ground
            8.43 k ohms pin2 to ground

            R270
            pin1 - 18.97V
            pin2 - 3.373V when not beeping, flashes between 3.373V and around 3.295V when 7 beeps are sounding

            Comment

            • dellxps15
              Badcaps Legend
              • Feb 2014
              • 1585
              • italy

              #126
              Re: Alienware M14x R2 with 7 beeps error

              q285 voltages on pin 3-4-5 ?

              edit:
              voltage on q27 pin 4 ?

              i think pin 4 of both q27 and q26 should be 18 volts...
              Last edited by dellxps15; 09-23-2017, 01:09 PM.

              Comment

              • Johndill
                Badcaps Veteran
                • Aug 2015
                • 314
                • Australia

                #127
                Re: Alienware M14x R2 with 7 beeps error

                Originally posted by dellxps15
                q285 voltages on pin 3-4-5 ?

                edit:
                voltage on q27 pin 4 ?

                i think pin 4 of both q27 and q26 should be 18 volts...
                Q285
                pin1 - 0.0mV
                pin2 - 0.1mV
                pin3 - 3.388V when not beeping, flashes between 3.388V and around 3.315V when 7 beeps are sounding
                pin4 - 0.0mV
                pin5 - 0.1mV
                pin6 - 2.574V when not beeping, flashes between 2.574V and around 2.495V when 7 beeps are sounding

                Q26
                pin1 - 2.585V when not beeping, flashes between 2.585V and around 2.505V when 7 beeps are sounding
                pin2 - 2.585V when not beeping, flashes between 2.585V and around 2.505V when 7 beeps are sounding
                pin3 - 2.585V when not beeping, flashes between 2.585V and around 2.505V when 7 beeps are sounding
                pin4 - 3.386V when not beeping, flashes between 3.386V and around 3.315V when 7 beeps are sounding
                pin5 - 5.13V
                pin6 - 5.13V
                pin7 - 5.13V
                pin8 - 5.13V

                Q27
                pin1 - 3.326V
                pin2 - 3.326V
                pin3 - 3.326V
                pin4 - 17.07V
                pin5 - 3.326V
                pin6 - 3.326V
                pin7 - 3.326V
                pin8 - 3.326V

                Comment

                • dellxps15
                  Badcaps Legend
                  • Feb 2014
                  • 1585
                  • italy

                  #128
                  Re: Alienware M14x R2 with 7 beeps error

                  as i said pin 4 of q26 is low. ih should be 17-18 volt like on q27.

                  2 reason: or r270 is bad or q26 is bad.

                  u can try:

                  1) replace r270 with 102k resistor

                  2) remove q26 and see if pin 4 get 17 volt and pin 1-2-3 get 5 volt.

                  Comment

                  • Johndill
                    Badcaps Veteran
                    • Aug 2015
                    • 314
                    • Australia

                    #129
                    Re: Alienware M14x R2 with 7 beeps error

                    Originally posted by dellxps15
                    1) replace r270 with 102k resistor
                    Will a 100.8k ohm resistor be within tolerance?

                    Comment

                    • dellxps15
                      Badcaps Legend
                      • Feb 2014
                      • 1585
                      • italy

                      #130
                      Re: Alienware M14x R2 with 7 beeps error

                      100,8k is ok for me.

                      Comment

                      • Johndill
                        Badcaps Veteran
                        • Aug 2015
                        • 314
                        • Australia

                        #131
                        Re: Alienware M14x R2 with 7 beeps error

                        Originally posted by dellxps15
                        1) replace r270 with 102k resistor.
                        With R270 resistor in the circuit, it is 39.3k ohms, when I test the original resistor out of circuit it is 101.6k ohms which is good.

                        Is this resistor ok? Should I put the replacment 100.2k ohm resistor in or put the original 101.6k ohm resistor back on??

                        Comment

                        • dellxps15
                          Badcaps Legend
                          • Feb 2014
                          • 1585
                          • italy

                          #132
                          Re: Alienware M14x R2 with 7 beeps error

                          try the new one....

                          Comment

                          • Johndill
                            Badcaps Veteran
                            • Aug 2015
                            • 314
                            • Australia

                            #133
                            Re: Alienware M14x R2 with 7 beeps error

                            What do you think of this rework station, it is in my budget and has temperature control and attachments.

                            http://www.ebay.com.au/itm/332327137330

                            Comment

                            • Johndill
                              Badcaps Veteran
                              • Aug 2015
                              • 314
                              • Australia

                              #134
                              Re: Alienware M14x R2 with 7 beeps error

                              Originally posted by dellxps15
                              try the new one....
                              Shows 39.3k ohms in circuit as before, voltage is the same with new resistor. Do I put the original back on?
                              Last edited by Johndill; 09-26-2017, 05:10 PM.

                              Comment

                              • caspian
                                Badcaps Legend
                                • Oct 2015
                                • 1589
                                • Laptop

                                #135
                                Re: Alienware M14x R2 with 7 beeps error

                                Originally posted by Johndill
                                What do you think of this rework station, it is in my budget and has temperature control and attachments.

                                http://www.ebay.com.au/itm/332327137330
                                I do not know about this brand.
                                however, this device does not seem stable and powerful.
                                If you always need a hot air rework station, buy some decent station like these ones:
                                Gordak-952 or BK-601D
                                or buy a used station. they should be cheap.

                                Comment

                                • caspian
                                  Badcaps Legend
                                  • Oct 2015
                                  • 1589
                                  • Laptop

                                  #136
                                  Re: Alienware M14x R2 with 7 beeps error

                                  now remove Q26 and measure voltages again.

                                  Comment

                                  • dellxps15
                                    Badcaps Legend
                                    • Feb 2014
                                    • 1585
                                    • italy

                                    #137
                                    Re: Alienware M14x R2 with 7 beeps error

                                    Originally posted by Johndill
                                    What do you think of this rework station, it is in my budget and has temperature control and attachments.

                                    http://www.ebay.com.au/itm/332327137330
                                    this is not good. get an atten 8586 or similar. it has controlled temperature, easy tips on market, all replacement parts and so on. its about 70-80 euros.

                                    put back the old resistor and remove q26 and see if pin 4 get 17 volts after q26 is removed. if yes, replace q26.

                                    Comment

                                    • Johndill
                                      Badcaps Veteran
                                      • Aug 2015
                                      • 314
                                      • Australia

                                      #138
                                      Re: Alienware M14x R2 with 7 beeps error

                                      Good news, I asked a local micro solder repairer guy (that runs his business from home) if I could use his rework station free of charge and he said yes I could :-) I went there today, I replaced R270 properly with it's original resistor and removed Q26 from the board, pad 4 of Q26 now gets 18V as it should and R270 gets around 99k ohms across, now I have to find a replacement for Q26 and hopefully that will fix the +5VS line :-)

                                      Comment

                                      • caspian
                                        Badcaps Legend
                                        • Oct 2015
                                        • 1589
                                        • Laptop

                                        #139
                                        Re: Alienware M14x R2 with 7 beeps error

                                        it is a good progress in this board repair.

                                        Comment

                                        • Johndill
                                          Badcaps Veteran
                                          • Aug 2015
                                          • 314
                                          • Australia

                                          #140
                                          Re: Alienware M14x R2 with 7 beeps error

                                          Where can I buy a new replacement IC marked AO4478 BA341R, I don't have this one on any of my donor boards, they are different markings.
                                          Attached Files

                                          Comment

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