Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

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  • sententia
    Badcaps Veteran
    • Oct 2013
    • 269
    • Greece
    #1

    Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

    Hello everyone!

    I am trying to repair this power supply and i seem to be kind of stuck...

    Mosfet Q603 was shorted, which also took out R634 ....

    The small main cap C910 (33uf) had leaked and was off...

    I have replaced both mosfets, the capacitor and the resistor and now have standby power but as soon as the relay clicks to switch on the TV i get 6 blink error led.... according to service manual its the 5V 12V supply error....

    I cannot find any other damaged parts, does anyone have any suggestions or can point to a direction please?

    Thank you!
    Attached Files
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    • sententia
      Badcaps Veteran
      • Oct 2013
      • 269
      • Greece
      #2
      Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

      Anyone any input?

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales
          #3
          Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

          If you disconnect the mainboard from the power supply and connect the 3.3V standby to PSON using a 1K resistor, does it bring up the 5V and 12V supply.
          Last edited by dick_barton; 06-02-2021, 06:35 AM.
          Willing to help but I'm no expert.

            Comment

            • sententia
              Badcaps Veteran
              • Oct 2013
              • 269
              • Greece
              #4
              Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

              PSON does seem to turn on the power supply (relay does not click)...

              There is no voltage on the 12v pins.

              on the other terminal there is also an ON/OFF pin if that has something to do...

              Thanks for the input!
              Attached Files
              Last edited by sententia; 06-02-2021, 07:28 AM.

                Comment

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales
                  #5
                  Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

                  ON/OFF is possibly the Tcon voltage.
                  There's a fusable resistor above D603 in the schematic. Have you checked it has not blown?
                  Is the 24V also missing?

                  Edit
                  What is the base/emitter/collector voltage on Q900
                  Last edited by dick_barton; 06-02-2021, 08:24 AM.
                  Willing to help but I'm no expert.

                    Comment

                    • sententia
                      Badcaps Veteran
                      • Oct 2013
                      • 269
                      • Greece
                      #6
                      Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

                      That resistor R634 was blown when the mosfet shorted...

                      It was replaced and is still good...

                      No output on the 24V either (it only connects to the inverter)

                      I do get 3.3 from 3.3VSB ...

                      :EDIT: Ok PSON needs to be pulled to Ground for the supply to switch on (the relay), but still no output except the 3.3VSB

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales
                          #7
                          Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

                          Can you give the voltage on the 3 legs of Q900
                          Willing to help but I'm no expert.

                            Comment

                            • sententia
                              Badcaps Veteran
                              • Oct 2013
                              • 269
                              • Greece
                              #8
                              Re: Philips 32PFL7403D/12 - Shorted mosfet -Delta DPS-182C Ppower supply

                              I was trying to desolder IC901 that was corroded and i may have shorted it due to overheating (probably).... It just wouldn't come off...

                              Either way the was a bit of smoke upon power on and got some nice fireworks after a min

                              I will need to take care of that before any further testing...

                              Thank you for the help!

                                Comment

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