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Philips 47PFL5704D F7 No Power

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    #1

    Philips 47PFL5704D F7 No Power

    Hello all and thanks in advance....

    I have been on this site for a few days now researching my problem and kind of have an idea of what my problem is. Long story short I have a Philips 47PFL5704D F7 and when it's plugged up I get no power at all. I opened the back and looked for the usual suspects being the caps and all seem to be good. But I did come across a IC chip (U101) labeled FVK31 "bottom line" FSQ510. This chip has 7 legs and the side with 3 legs is blown the leg is blown off the chip, so I think maybe replacing this chip may solve my problem. Then I begin to think what would have caused this problem and if I replace the chip will it blow again. So any help would be gladly appreciated.

    I also tried to find the chip and it seems that I can order off ebay from China for really cheap but do anyone know where I can get this from closer maybe radioshack? I live in Chicago.


    Thanks again.....
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    #2
    Re: Philips 47PFL5704D F7 No Power

    What the heck is going on here!!!! We had a bunch of threads that opened with something like "My TV dont work. how d o i fix itt?"

    Now you come along and give a great description, and provide excellent pictures. It's great.

    Sorry, you only get a silver star. If you had Googled buy FSQ510 you would have discovered Mouser Electronics in Texas has them available for $1.18, shipping will run $5, and you should have it on Saturday.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment

      #3
      Re: Philips 47PFL5704D F7 No Power

      findchips.com is fast easy way to find parts as it searches all the major distributors for you.

      http://www.findchips.com/avail?part=FSQ510
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        #4
        Re: Philips 47PFL5704D F7 No Power

        LOL.....Thanks for the fast response I googled FSQ510 but not "buy FSQ510" I should have thought of that.

        Thanks
        again

        Comment

          #5
          Re: Philips 47PFL5704D F7 No Power

          Originally posted by kolpro View Post
          Then I begin to think what would have caused this problem and if I replace the chip will it blow again. So any help would be gladly appreciated.
          Datasheet is at



          That pin looks like the Drain from figure 3. The description says high voltage power SenseFET drain connection.
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            #6
            Re: Philips 47PFL5704D F7 No Power

            Yep I just check that datasheet as well does this give you a flag as to maybe why it blew and maybe if I should be checking something else as well?

            Comment

              #7
              Re: Philips 47PFL5704D F7 No Power

              Thanks much I just ordered the part from Mouser Electronics and once the part comes in I'll post the results. I went ahead and ordered 2 just for the heck of it only cost me $11 bucks with shipping.

              Comment

                #8
                Re: Philips 47PFL5704D F7 No Power

                Originally posted by kolpro View Post
                Yep I just check that datasheet as well does this give you a flag as to maybe why it blew and maybe if I should be checking something else as well?
                I would check the following for potential shorted components:

                - bridge rectifier
                - power mosfet
                - all diodes in and around U101
                - R104 - see if it matches its color band

                Good call on ordering 2.
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                  #9
                  Re: Philips 47PFL5704D F7 No Power

                  If it's the drain it's tied directly to the internal fet, so it's likely the fet died in a spectacular fashion. Causes include a power surge, high temperature, peaking drain voltage (exceeding 700V is okay once or twice... but not too many times) or a chip that was just on it's last legs (e.g. from being operated near it's limits continuously, like in a current limit mode.)

                  I would expect the mains fuse to blow; check that (including the plug fuse.)
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                    #10
                    Re: Philips 47PFL5704D F7 No Power

                    Originally posted by retiredcaps View Post
                    I would check the following for potential shorted components:

                    - bridge rectifier
                    - power mosfet
                    - all diodes in and around U101
                    - R104 - see if it matches its color band

                    Good call on ordering 2.

                    Do I need to check these components out of the circuit or can I check them in place for the short?

                    Comment

                      #11
                      Re: Philips 47PFL5704D F7 No Power

                      Check in circuit, if any shorts show up then remove and re-test to confirm.

                      Comment

                        #12
                        Re: Philips 47PFL5704D F7 No Power

                        Ok I tested for shorts and here are the results so far.

                        D101--.554
                        D102---.558
                        D107--.458
                        D111---.460
                        D301--.193
                        D510--.458
                        D501--.457
                        D203--.164
                        If I test the in opposite direction I get 0 for all D***

                        R104 -- 196k ohms

                        tested the Bridge and no shorts it tested good

                        Please let me know if I'm missing something.

                        Thanks
                        Last edited by kolpro; 01-06-2012, 01:09 PM.

                        Comment

                          #13
                          Re: Philips 47PFL5704D F7 No Power

                          Power mosfet? It usually is a 3 pin IC that is mounted on a heatsink. Measure the resistance between pins 1-2, 1-3, and 2-3.
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                            #14
                            Re: Philips 47PFL5704D F7 No Power

                            Originally posted by retiredcaps View Post
                            Power mosfet? It usually is a 3 pin IC that is mounted on a heatsink. Measure the resistance between pins 1-2, 1-3, and 2-3.
                            There isn't one. It's been integrated into the FSQ510.

                            PlainBill
                            For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                            Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                            Comment

                              #15
                              Re: Philips 47PFL5704D F7 No Power

                              Originally posted by PlainBill View Post
                              There isn't one. It's been integrated into the FSQ510.
                              Ahh, yes, now I remember. Too many balls in the air today.
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                                #16
                                Re: Philips 47PFL5704D F7 No Power

                                Ok I installed the FSQ510 chip and still no power to the TV........

                                Comment

                                  #17
                                  Re: Philips 47PFL5704D F7 No Power

                                  With the FSQ510 chip installed in the circuit, measure the voltage on pin 3 (Vfb), pin 5 (Vcc), and pin 8 (Vstr). Post what voltages you get. Use pin 1 and 2 (GND) as ground or use hot ground (the "-" of the bridge rectifier on the primary).
                                  Try to perform the test fairly quickly (i.e. don't apply power to the TV for too long). This is to prevent anything else from going bad.
                                  Last edited by momaka; 01-09-2012, 09:34 PM.

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                                    #18
                                    Re: Philips 47PFL5704D F7 No Power

                                    Here are the readouts.....I used pin 1 as ground

                                    pin 8 -------147 volts
                                    pin 5 ------- 0 volts
                                    pin 3 ------- 0 volts

                                    Thanks again!

                                    I was trying to find a schematic of this board but can not.
                                    Last edited by kolpro; 01-09-2012, 10:08 PM.

                                    Comment

                                      #19
                                      Re: Philips 47PFL5704D F7 No Power

                                      Interesting...
                                      Pin 5 (Vcc) needs to be at least 8.7V in order for the FSQ510 to start and continue to be no less than 6.7V for the FSQ510 to keep operating. Should there be a fault, data sheet says the voltage will fluctuate between 6.7V and 8.7V. The fact that it's not suggests that perhaps Vcc is being pulled low by a shorted component.
                                      The voltage on Pin 3 (Vfb) should also be close to 2.8V when the PSU is operating normally and 4.7V when in overload protection. Getting zero for this one likely means the PSU is not even trying to start.

                                      If possible, post a few more pictures of the PSU - one capturing the underside of the whole board and 1 of the topside again capturing the whole board. The FSQ510 data sheet has a sample circuit on page 2. It looks pretty simple. I think we should be able to figure out the circuit in your PSU without a schematic pretty easily. Just need good pictures.
                                      Last edited by momaka; 01-09-2012, 11:32 PM.

                                      Comment

                                        #20
                                        Re: Philips 47PFL5704D F7 No Power

                                        Thanks again I just posted multiple pics to make sure that you can see them good.
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