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Philips 42PF7320 plasma, strange problems

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    #21
    Re: Philips 42PF7320 plasma, strange problems

    And, your meter may be set to VAC?
    On some panels Vset is measured as Vs+Vset so subtract Vs from it to get actual Vset.
    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.

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      #22
      Re: Philips 42PF7320 plasma, strange problems

      Thanks for the info. I haven't been able to get back to the TV project for a little while, but I will try the suggestions and I'll keep you updated.

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        #23
        Re: Philips 42PF7320 plasma, strange problems

        Ok, I briefly had a chance to get back to it tonight. I changed out the battery to the multimeter. Still have about the same results.
        Attached Files

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          #24
          Re: Philips 42PF7320 plasma, strange problems

          Originally posted by DPark View Post
          Still have about the same results.
          Try putting your black probe on the connector pin marked GND (just below Vset).
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            #25
            Re: Philips 42PF7320 plasma, strange problems

            To make sure your multimeter is working properly, try the following test.

            1) Measure the 5V standby rail with it set on 20V DC. It should read something like 5.00V.

            2) Measure the 5V standby rail with it set on 200V DC. It should read something like 5.0V.

            3) Measure the 5V standby rail with it set on 200V DC. It should read something like 5V.

            4) Report your findings for all above.

            If your multimeter is not working correct, which is possible, borrow/buy another one. In addition, if you want help fixing the one you have, start a new post and I'll make suggestions on what could be wrong.

            PS. One retiredcaps' bonus point for a picture of your multimeter.
            Last edited by retiredcaps; 05-27-2013, 11:28 PM.
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              #26
              Re: Philips 42PF7320 plasma, strange problems

              Originally posted by retiredcaps View Post
              3) Measure the 5V standby rail with it set on 200V DC. It should read something like 5V.
              Whoops, just noticed my error in cut & paste above.

              The "correct" #3 is

              3) Measure the 5V standby rail with it set on 600V DC. It should read something like 5.0V.
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                #27
                Re: Philips 42PF7320 plasma, strange problems

                I tried the black probe (with red on the vset pin) to the pin connector ground as well as on the board at different points and it seems to range between 480-530V. Even the two ground pins in the same connector seemed to measure different amounts!

                I tested the multimeter at the 5v location retiredbadcaps sugggested. All seems normal.

                Multimeter at 600 - 4-5 (fluctuates) on the display
                Multimeter at 200 - 5.1 on the display
                Multimeter at 20 - 5.13 on the display

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                  #28
                  Re: Philips 42PF7320 plasma, strange problems

                  Originally posted by DPark View Post
                  I tested the multimeter at the 5v location retiredbadcaps sugggested. All seems normal.

                  Multimeter at 600 - 4-5 (fluctuates) on the display
                  Multimeter at 200 - 5.1 on the display
                  Multimeter at 20 - 5.13 on the display
                  My interpretation of your readings above is that your multimeter is defective when using the 600V range.

                  At 600, it should show steady/solid 5 because your standby voltage is a steady/solid 5.13.

                  When it is fluctuating between 4-5, the "4" reading suggests it can be between 3.51 and 4.49.

                  I suggest borrowing or using another multimeter to redo the vset reading.

                  Here is a link to your multimeter



                  As you can see on page 8, when it is set to 600V DC range, there is only one digit of resolution so it should show a steady/solid 5V.
                  Attached Files
                  Last edited by retiredcaps; 05-28-2013, 11:00 PM.
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                    #29
                    Re: Philips 42PF7320 plasma, strange problems

                    Originally posted by tom66 View Post
                    On some panels Vset is measured as Vs+Vset so subtract Vs from it to get actual Vset.
                    @DPark, what is your Vs+ reading?

                    If your multimeter is working correctly, then we need to know the Vs+ reading.
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                      #30
                      Re: Philips 42PF7320 plasma, strange problems

                      Finally had some time to mess with this TV again. Model: 42PF222A/37 Power Supply: 44-00101B.
                      It will power on for about 5-10 minutes, but then shuts off after a couple of relay clicks. 5-blink error code when this happens.
                      All voltages seem to check out fine with the new meter I have when the power is on. The only one that seems to be more than 10% off is SND_P.

                      Factory Specs / Actual Reading
                      Va=70 / 70
                      Vsc=206 / 206
                      Se=86 / 86
                      Vset=195 / 194.2
                      5v2=5.2 / 5.17
                      5vsw=5.2 /5.15
                      8v6=8.6 / 8.64
                      12v=12.5 / 12
                      SND_P=18v / 20.2

                      Anyone have any suggestions on what else I should check or replace? I could just buy a refurb board for less than $50 but what fun would that be?

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                        #31
                        Re: Philips 42PF7320 plasma, strange problems

                        The voltages look fine -- I don't think the problem is with the PSU.
                        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.

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