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    #1

    Pana TH-50PX77U dead

    Have a panasonic th50PX77u thats completely dead (apply power - no clicks or lights) - PSU etxmm655meh.
    checked all fuses (4)

    no 5V at pin 5 of connector A7 when the
    TV is plugged into the AC line

    TV unplugged - 1 ohm continuity between pins 8 and 10 of connector P12 of the P board
    disconnected A7 conn - set does nothing,
    assuming the PSU is bad. looking for diagnostics on PSU - or what to look for ?

    does anyone have any diagnostic or repair tips for this PSU ?? I've seen a blog that says replace MC201, MC301 and maybe IC tea1610. Thanks
    Tags: None
    #2
    Re: Pana TH-50PX77U dead

    Originally posted by tom66 View Post
    Are fuses OK on your board? You should really start a new thread.
    Originally posted by tw2005 View Post
    Not sure if the troubleshooting guide I have is exactly correct for this model. Do you have a copy . It's quite detailed.
    since it's dead, no clicks, says first step is

    1.Is there 5V at
    pin 5 of connector A7 when the
    TV is plugged into
    the AC line?

    NO to step 1
    Unplug the TV. Is there continuity between pins 8 and 10 of connector P12 of the P board?

    YES to 1

    Is
    there 3.3V at
    pin 6 of connector P7 when the
    TV is plugged into
    the AC line?

    What have you checked so far? Fuses?


    Originally posted by ajshoe View Post
    tried to start new thread - HOW ????

    no 5V at pin 5 of connector A7 when the
    TV is plugged into the AC line

    TV unplugged - 1 ohm continuity between pins 8 and 10 of connector P12 of the P board

    assuming the PSU is bad. looking for diagnostics on PSU - or what to look for ?
    Originally posted by tw2005 View Post
    probably is a PSU issue.

    Unplug the TV.
    Disconnect connector A7.
    Does the TV turn on by itself
    when it is plugged into the AC
    line with no picture and lit
    LEDs on SS & SC
    boards?

    If not then PSU.

    You have no STDBY 5v so I'd start with the fuses F601,602,501, thermal fuse RF601.

    manual and troubleshooting guide should be in Tom's reference library in the sticky.

    TRAINING MANUAL

    SERVICE MANUAL

    you should be able to start a new post from the front page.
    ,

    Start with the basics.
    Attached Files

    Comment

      #3
      Re: Pana TH-50PX77U dead

      done the basics - took off heat sink on psu. checked all fuses. RF601 - all good.
      no 3.3V at pin 6 of connector P7 when the TV is plugged into the AC line
      I'll have to print out psu schematics and start over.
      Last edited by ajshoe; 04-22-2014, 11:25 AM.

      Comment

        #4
        Re: Pana TH-50PX77U dead

        can't seem to find any info on these ICs - attached PSU schematic and voltage readings. is there panasonic test point voltages out there ???
        Attached Files

        Comment

          #5
          Re: Pana TH-50PX77U dead

          That's the standby supply...
          What voltage do you have across C503?
          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

            #6
            Re: Pana TH-50PX77U dead

            think I wasn't using correct ground - going to re test. across c503 = +164 volts
            Attached Files
            Last edited by ajshoe; 04-23-2014, 11:30 AM.

            Comment

              #7
              Re: Pana TH-50PX77U dead

              bump
              Attached Files
              Last edited by ajshoe; 04-23-2014, 11:33 AM.

              Comment

                #8
                Re: Pana TH-50PX77U dead

                turns out T501 was open - removed it, had corrosion on windings for this circuit. re-soldered and set works great. Not sure how just 2 windings of this xformer are corroded - maybe some contamination ?? something must have dropped on power board right at this location. Not a fan of this set thou - doesn't have menu button on set - hard to navigate without remote (complaining on a free set !)
                On another note - anyone experimented with mip3e3 substitution ?? like sub in mip2e series (3 Pin) ?? The mip3e3 is discontinued and can't find data sheets on it - think the mip2e can be subbed in with some work.

                Comment

                  #9
                  Re: Pana TH-50PX77U dead

                  well done with the TV, obscure fault for sure.

                  The specs on this will be the same http://www.utsource.net/pdf/pdf-MIP3E3.html

                  Just it's the TO-220 package as opposed to the DIP7.

                  http://www.alldatasheet.com/datashee...MIP2E3DMY.html

                  Comment

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