Dell E5530 completely dead and MOSFET getting HOT! Please help.

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  • mon2
    Badcaps Legend
    • Dec 2019
    • 14190
    • Canada
    #21
    Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

    P-channel; SOT23 package; 30V and approx current similar to original although this requirement is not critical since there is no load if working properly on these mosfets.

    Perhaps the heating is due to the other parts mating with this one so best to test again when each mosfet is removed from the logic board.

      Comment

      • FrozenHaxor
        Badcaps Veteran
        • Jun 2015
        • 260
        • Poland
        #22
        Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

        Current capability of replacement MOSFET must be equal or greater for reliable operation. Make sure Rdson is low as well (lower is better).

          Comment

          • roxboy1984
            Senior Member
            • Jan 2022
            • 177
            • South Africa
            #23
            Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

            Originally posted by mon2
            Both look too low in the readings.

            Carefully remove each and measure them when they are out of the circuit to confirm the readings are consistent. They appear to be defective based on the thermal view and the low resistance readings.

            Out of the circuit these are the readings im getting.

            PQ1301
            source & drain = 4.3 kilo ohms
            source & gate = 0.231 kilo ohms
            gate & drain = 4.24 Kilo ohms
            PQ1302
            source & drain = 0.205 Kilo ohms
            source & gate = 0.203 Kilo ohms
            gate & drain = 2.3 ohms

              Comment

              • roxboy1984
                Senior Member
                • Jan 2022
                • 177
                • South Africa
                #24
                Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

                Im battling to read any of the markings on the jellyfish mosfets on the donor boards i have as i dont have a scope. Ive managed to make out i think "WT11" and a "BK3" "K72" "702W" "34nx5" would any of these work as a replacement for PQ1301 and PQ1302?

                  Comment

                  • mon2
                    Badcaps Legend
                    • Dec 2019
                    • 14190
                    • Canada
                    #25
                    Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

                    No. The donor parts are N-channel but we need P-channel mosfets.

                    Do you have access to Digikey / Mouser / Arrow electronics in your region? AliExpress is an option but will take time.

                      Comment

                      • roxboy1984
                        Senior Member
                        • Jan 2022
                        • 177
                        • South Africa
                        #26
                        Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

                        Originally posted by mon2
                        No. The donor parts are N-channel but we need P-channel mosfets.

                        Do you have access to Digikey / Mouser / Arrow electronics in your region? AliExpress is an option but will take time.
                        I have the following donor boards. surely they must have a p-channel i can use? ACLUA/ACLUB NM-A273, DAOLX6MB, dv15 brazos mb - 10302-1.

                        the above options you listed will take forever where i live unfortunately.

                          Comment

                          • roxboy1984
                            Senior Member
                            • Jan 2022
                            • 177
                            • South Africa
                            #27
                            Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

                            Originally posted by mon2
                            No. The donor parts are N-channel but we need P-channel mosfets.

                            Do you have access to Digikey / Mouser / Arrow electronics in your region? AliExpress is an option but will take time.
                            So I just wanted to ask a question. would it be a viable option to remove those mosfets and inject voltage bypassing those mosfets and see if something else gets hot to determine if it is indeed those mosfets that are the issue. if so, where would you recommend injecting voltage from?

                              Comment

                              • roxboy1984
                                Senior Member
                                • Jan 2022
                                • 177
                                • South Africa
                                #28
                                Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

                                If i inject voltage then PU11 "CD3301B"starts to heat up.

                                  Comment

                                  • roxboy1984
                                    Senior Member
                                    • Jan 2022
                                    • 177
                                    • South Africa
                                    #29
                                    Re: Dell E5530 completely dead and MOSFET getting HOT! Please help.

                                    ok so using a scope i am able to read the Mosfets that are heating up. They have the following written TR2N, If i look up this Mosfet online it is saying that its an N-channel ? Is this correct? https://alltransistors.com/mosfet/tr...ansistor=37216

                                      Comment

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