Acer No power A4WAB LA-C341P REV 1.0

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  • kalilinux25
    Badcaps Legend
    • Mar 2018
    • 2080
    • ZAMBOANGA SIBUGAY

    #21
    Re: Acer No power A4WAB LA-C341P REV 1.0

    Originally posted by mon2
    PR316 is bad.

    Power down and check the resistance of this resistor.
    I tried to check the resistor by removing it outboard I got the exact value 316k but after putting it back to the board Ive lost the 3.3v to the pin 2 of PR316

    Checking the pin 10 of PU301 ilim- 0v
    Last edited by kalilinux25; 06-23-2021, 07:39 PM.

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 13948
      • Canada

      #22
      Re: Acer No power A4WAB LA-C341P REV 1.0

      Check pr317 and the cap pc320. One of these must be shunting the voltage to ground. If the ic is soldered ok and is not defective then this rail should not be zero volts.

      Comment

      • kalilinux25
        Badcaps Legend
        • Mar 2018
        • 2080
        • ZAMBOANGA SIBUGAY

        #23
        Re: Acer No power A4WAB LA-C341P REV 1.0

        Originally posted by mon2
        Check pr317 and the cap pc320. One of these must be shunting the voltage to ground. If the ic is soldered ok and is not defective then this rail should not be zero volts.
        Resistor shows 87 kilo ohms out of the board
        the caps is not shorted

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13948
          • Canada

          #24
          Re: Acer No power A4WAB LA-C341P REV 1.0

          Then the ic must have a short. This pin is an input and the external resistor voltage divider must present a non-zero value to denote the max amount of current for this regulator.

          Comment

          • kalilinux25
            Badcaps Legend
            • Mar 2018
            • 2080
            • ZAMBOANGA SIBUGAY

            #25
            Re: Acer No power A4WAB LA-C341P REV 1.0

            Originally posted by mon2
            Then the ic must have a short. This pin is an input and the external resistor voltage divider must present a non-zero value to denote the max amount of current for this regulator.
            I need to change the BQ24735RGRR ? pu301

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13948
              • Canada

              #26
              Re: Acer No power A4WAB LA-C341P REV 1.0

              1) PR317 should be 100k 0402 1% tolerance.

              2) Based on the same page in the schematic, with 100k & 316k voltage divider using +3VALW, this configures this charger IC to support 3.966A of current.

              This will only occur if there is a non-zero value at the middle junction of these 2 resistors.

              Currently (no pun) you have 0 volts at this common pin # 10 (ILIM).

              3) Confirm that the pin #10 of PU301 is not shorting to something else under the chip. Perhaps even consider to flux and reflow this IC. Then check the voltage on this pin again.

              4) Aside from the above, believe that you should consider sourcing a fresh IC and replace this PU301 and then test again.

              5) As a test, you can remove PU301 but also remove PL302 and then power up and check the voltage at the pad for Pin # 10.

              Based on the 2 resistor values, this pin must be a non-zero voltage value.

              I would also source a 100k 0402 1% resistor to replace the 87k one on the logic board.

              The reason to remove the PL302 is to prevent any voltages from being sent downstream in the absence of this PU301 IC. Thought is that PU301 is now strapping the Pin #10 to ground, either due to a solder short and internal defect.

              Comment

              • kalilinux25
                Badcaps Legend
                • Mar 2018
                • 2080
                • ZAMBOANGA SIBUGAY

                #27
                Re: Acer No power A4WAB LA-C341P REV 1.0

                Originally posted by mon2
                1) PR317 should be 100k 0402 1% tolerance.

                2) Based on the same page in the schematic, with 100k & 316k voltage divider using +3VALW, this configures this charger IC to support 3.966A of current.

                This will only occur if there is a non-zero value at the middle junction of these 2 resistors.

                Currently (no pun) you have 0 volts at this common pin # 10 (ILIM).

                3) Confirm that the pin #10 of PU301 is not shorting to something else under the chip. Perhaps even consider to flux and reflow this IC. Then check the voltage on this pin again.

                4) Aside from the above, believe that you should consider sourcing a fresh IC and replace this PU301 and then test again.

                5) As a test, you can remove PU301 but also remove PL302 and then power up and check the voltage at the pad for Pin # 10.

                Based on the 2 resistor values, this pin must be a non-zero voltage value.

                I would also source a 100k 0402 1% resistor to replace the 87k one on the logic board.

                The reason to remove the PL302 is to prevent any voltages from being sent downstream in the absence of this PU301 IC. Thought is that PU301 is now strapping the Pin #10 to ground, either due to a solder short and internal defect.



                I tried the option to remove the PU301 and the PL302

                Checking voltage at

                PQ302
                5. 19V
                1,2,3, - 0V
                4 -0V

                PIN 10 of pad #10 0v

                maybe it has no voltage beacause it wont allow the PQ302to passs the 19v?

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13948
                  • Canada

                  #28
                  Re: Acer No power A4WAB LA-C341P REV 1.0

                  No. If the 316k is mated to +3v3Alw which it is and the 100k is truly to ground (confirm this) then you have a resistor based voltage divider. For this reason, this cannot be 0 volts unless one of these resistors is defective or not as connected in the schematic.

                  Google "resistor voltage divider calculator" and punch in the 3.3 volts; 316k, 100k value to see the expected voltage value.

                  https://ohmslawcalculator.com/voltag...der-calculator

                  Comment

                  • kalilinux25
                    Badcaps Legend
                    • Mar 2018
                    • 2080
                    • ZAMBOANGA SIBUGAY

                    #29
                    Re: Acer No power A4WAB LA-C341P REV 1.0

                    Originally posted by mon2
                    No. If the 316k is mated to +3v3Alw which it is and the 100k is truly to ground (confirm this) then you have a resistor based voltage divider. For this reason, this cannot be 0 volts unless one of these resistors is defective or not as connected in the schematic.

                    Google "resistor voltage divider calculator" and punch in the 3.3 volts; 316k, 100k value to see the expected voltage value.

                    https://ohmslawcalculator.com/voltag...der-calculator
                    trying to reflow the resistors then tried a new reissitor same issue no 3.3v present

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13948
                      • Canada

                      #30
                      Re: Acer No power A4WAB LA-C341P REV 1.0

                      Check the resistance on the 100k resistor. Is it zero ohms at the pin that mates with the 316k?

                      Is the other pad of the 100k really mated to ground?

                      Remove the cap in this area to rule out the cap as a short.

                      Comment

                      • kalilinux25
                        Badcaps Legend
                        • Mar 2018
                        • 2080
                        • ZAMBOANGA SIBUGAY

                        #31
                        Re: Acer No power A4WAB LA-C341P REV 1.0

                        Originally posted by mon2
                        Check the resistance on the 100k resistor. Is it zero ohms at the pin that mates with the 316k?

                        Is the other pad of the 100k really mated to ground?

                        Remove the cap in this area to rule out the cap as a short.
                        Yes everything is mated to ground the cap was remove then tried to plug power no voltage reading again to the resistors

                        Comment

                        • kalilinux25
                          Badcaps Legend
                          • Mar 2018
                          • 2080
                          • ZAMBOANGA SIBUGAY

                          #32
                          Re: Acer No power A4WAB LA-C341P REV 1.0

                          Originally posted by mon2
                          Check the resistance on the 100k resistor. Is it zero ohms at the pin that mates with the 316k?

                          Is the other pad of the 100k really mated to ground?

                          Remove the cap in this area to rule out the cap as a short.

                          I now tried to change thePU301 blinking LED at the power led the charging light and the blue light its taking only 6 amps unstable..


                          PQ302

                          pin 1- 0v
                          pin 2-4- 0v
                          pin 5 20v

                          PU301

                          PIN 1 -20V
                          PIN 2 - 20V
                          PIN 3 - 10-11V not stable
                          PIN 4 - 11, 12, 13 not stable
                          pin 5- 1v not stable 1.1v
                          pin 6 - 2.7v stable
                          pin 7 -0v
                          pin 8 - 3.3v
                          pin 9 - 3.3v
                          pin 10 - 0v
                          pin 11- 24v
                          pin 12 - 20v
                          pin 13 - 20v
                          pin 14 - 0v
                          pin 15 - 0v
                          pn 16 - 6.0v stable
                          PIN 17 -20V STABLE
                          PIN 18 - 20V STABLE
                          PIN 19 - 20V
                          PIN 20- 20V


                          PL402 - 3.3V
                          PL404 - 5V

                          Comment

                          • Sametbey
                            Badcaps Veteran
                            • Jan 2021
                            • 229
                            • Turkey

                            #33
                            Re: Acer No power A4WAB LA-C341P REV 1.0

                            First of all, your AC power supply must be working properly. charge control voltages are in the picture. The IO needs to receive +3V LDO and AC_OK signal to work. By sending EC_ON after the IO AC_OK signal, +3v and +5v are activated. ILIM is not so important, it can be 0. If there is no short circuit in the +B19 line, the PU301 charge control voltages should be as follows.
                            Attached Files
                            I'm not happy to be so strong. because it's not humanly

                            Comment

                            • kalilinux25
                              Badcaps Legend
                              • Mar 2018
                              • 2080
                              • ZAMBOANGA SIBUGAY

                              #34
                              Re: Acer No power A4WAB LA-C341P REV 1.0

                              Originally posted by Sametbey
                              First of all, your AC power supply must be working properly. charge control voltages are in the picture. The IO needs to receive +3V LDO and AC_OK signal to work. By sending EC_ON after the IO AC_OK signal, +3v and +5v are activated. ILIM is not so important, it can be 0. If there is no short circuit in the +B19 line, the PU301 charge control voltages should be as follows.
                              Yes but Unit still no power sir why its causing it what to test and change\

                              Comment

                              • kalilinux25
                                Badcaps Legend
                                • Mar 2018
                                • 2080
                                • ZAMBOANGA SIBUGAY

                                #35
                                Re: Acer No power A4WAB LA-C341P REV 1.0

                                Hi hope someone can help me?

                                Comment

                                • SMDFlea
                                  Super Moderator
                                  • Jan 2018
                                  • 20596
                                  • UK

                                  #36
                                  Re: Acer No power A4WAB LA-C341P REV 1.0

                                  Originally posted by kalilinux25
                                  Hi hope someone can help me?
                                  SW4 BI SW .Press the switch in .
                                  All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                  Comment

                                  • kalilinux25
                                    Badcaps Legend
                                    • Mar 2018
                                    • 2080
                                    • ZAMBOANGA SIBUGAY

                                    #37
                                    Re: Acer No power A4WAB LA-C341P REV 1.0

                                    Originally posted by SMDFlea
                                    SW4 BI SW .Press the switch in .
                                    how can I test it sir?

                                    Comment

                                    • kalilinux25
                                      Badcaps Legend
                                      • Mar 2018
                                      • 2080
                                      • ZAMBOANGA SIBUGAY

                                      #38
                                      Re: Acer No power A4WAB LA-C341P REV 1.0

                                      Originally posted by SMDFlea
                                      SW4 BI SW .Press the switch in .
                                      I already tried the switch same issue

                                      Comment

                                      • kalilinux25
                                        Badcaps Legend
                                        • Mar 2018
                                        • 2080
                                        • ZAMBOANGA SIBUGAY

                                        #39
                                        Re: Acer No power A4WAB LA-C341P REV 1.0

                                        If the board is plug without power press I only have 5V present @ PL404 I dont have 3V @ pl402 . Ive check resistance of PL402 around 3kilo ohms PL404 5KILO OHMS. If I press power it will produce a stable 3.3v and 5v but it only takes 8milliamps to 10 milliamps

                                        Comment

                                        • kalilinux25
                                          Badcaps Legend
                                          • Mar 2018
                                          • 2080
                                          • ZAMBOANGA SIBUGAY

                                          #40
                                          Re: Acer No power A4WAB LA-C341P REV 1.0

                                          Originally posted by Sametbey
                                          First of all, your AC power supply must be working properly. charge control voltages are in the picture. The IO needs to receive +3V LDO and AC_OK signal to work. By sending EC_ON after the IO AC_OK signal, +3v and +5v are activated. ILIM is not so important, it can be 0. If there is no short circuit in the +B19 line, the PU301 charge control voltages should be as follows.
                                          Hi sir can you send me a clear image

                                          Comment

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