Westinghouse SK-26H735S Power Supply Problem

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  • bmolke
    Member
    • Jul 2012
    • 21
    • usa
    #21
    Re: Westinghouse SK-26H735S Power Supply Problem

    Bud, all voltages read low. The power supply is making a clicking sound which sounds like it is coming from the transformer. no led lights come on nothing

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA
        #22
        Re: Westinghouse SK-26H735S Power Supply Problem

        So the 5V is also reading low? How much?
        Last edited by budm; 10-05-2013, 07:02 PM.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • bmolke
            Member
            • Jul 2012
            • 21
            • usa
            #23
            Re: Westinghouse SK-26H735S Power Supply Problem

            Bud, first off thanks for trying to help me out. I appreciate it. the 5 volt standby is reading 1.2v.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA
                #24
                Re: Westinghouse SK-26H735S Power Supply Problem

                OK, ALL of them are low which I am surprise that the 12v and the 24V even turn on by the main board since the voltage is so low for the main board to work and be able to send the PS_ON signal. We will need to work on and find out why the 5VSTBY is low first before going further.
                What you can do right now is the have the power supply board connected to the power cord only and nothing else is connected to see if the 5V will be 5V, then we need to put 5 Ohms 5Watts resistor as the load on 5V to see if the it will stay at 5V.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • bmolke
                    Member
                    • Jul 2012
                    • 21
                    • usa
                    #25
                    Re: Westinghouse SK-26H735S Power Supply Problem

                    Bud, with just the power supply connected to the power cord I do get 5v on the 5 volt standby.

                      Comment

                      • bmolke
                        Member
                        • Jul 2012
                        • 21
                        • usa
                        #26
                        Re: Westinghouse SK-26H735S Power Supply Problem

                        as far as putting the resistor as load. I would have to order a resistor and im not sure how to connect it as load. I am inexperienced at that.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA
                            #27
                            Re: Westinghouse SK-26H735S Power Supply Problem

                            So it can be that the main board draws too much current or the power supply is bad due to bad caps. There are small start up/running caps in the primary side for the 5V supply, their values are usually about 22~56uF 50vdc or so. Bad caps can also look normal but can have high ESR, you will need ESR meter to find out.
                            Never stop learning
                            Basic LCD TV and Monitor troubleshooting guides.
                            http://www.badcaps.net/forum/showthr...956#post305956

                            Voltage Regulator (LDO) testing:
                            http://www.badcaps.net/forum/showthr...999#post300999

                            Inverter testing using old CFL:
                            http://www.badcaps.net/forum/showthr...er+testing+cfl

                            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                            http://s807.photobucket.com/user/budm/library/

                            TV Factory reset codes listing:
                            http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • bmolke
                                Member
                                • Jul 2012
                                • 21
                                • usa
                                #28
                                Re: Westinghouse SK-26H735S Power Supply Problem

                                all caps have been replaced.

                                  Comment

                                  • bmolke
                                    Member
                                    • Jul 2012
                                    • 21
                                    • usa
                                    #29
                                    Re: Westinghouse SK-26H735S Power Supply Problem

                                    bud what can I check on the mainboard to see if I can locate a bad component.

                                      Comment

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