Announcement

Collapse
No announcement yet.

Phillips 37PF5521D dead after power cut

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #21
    Re: Phillips 37PF5521D dead after power cut

    Originally posted by flocko View Post
    no the relay is not clicking, there is no component at 9320 it a wire link, yes i think the component on the heatsink is a bridge rectifier,r3318 100ohm 1/2 watt was ok but i have changed it for 470ohm 1/2 watt . do you think it could be the rectifier would i need to take it off the boar to test it ?
    I am just trying to establish how far the voltage is getting.

    Obviously you should have 230 v ac at the black and white mains socket?
    You should have 230vac at the ceramic fuse.
    Next usual thing to check is the Bridge - should be 230vac on the centre pins (should be marked ~~ and 320VDC on the outer pins which should be marked + and -.
    If you dont get those then you test what is in between - Budm's resistor?
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment


      #22
      Re: Phillips 37PF5521D dead after power cut

      OK, just checked the voltages on the bridge AC, something odd is going on. The two centre terminals AC when I checked with the meter are reading 0 volts. If I check AC again with one lead to the negative cap, other lead to bridge, again 0 volts.
      Only when I connect my meter to one side of the incoming supply and either one of the centre pins(AC) do I get 240 volts to each pin. I cannot work this out.
      Would appreciate any help pointing me in the right direction.

      Comment


        #23
        Re: Phillips 37PF5521D dead after power cut

        That relay is not clicking on, so you will not see main power (bridge will appear dead.)
        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


          #24
          Re: Phillips 37PF5521D dead after power cut

          It would help if you answered the questions as asked without getting sidetracked and asking another question.
          Do you get 230vac at the fuse?
          Do you get 230vac at the two~ contacts on the bridge.

          There are a couple of test for a bridge - this is one

          Get a felt tip pin and follow the pins through the board and mark the board
          ...... + ~ ~ -
          Pins 0 0 0 0
          ...... 1 2 3 4
          Mains power OFF
          Set your meter to measure 2000 ohms.

          Place positive (red) probe on the + pin. 1 above
          Place negative (black) probe on the ac pin 2 above.
          Write down the result. ohms

          Place positive (red) probe on the ac pin. 2 above
          Place negative (black) probe on the + pin 1 above.
          Write down the result ohms

          Place positive (red) probe on the ac pin. 2 above
          Place negative (black) probe on the ac pin 3 above.
          Write down the result ohms

          Place positive (red) probe on the ac pin. 3 above
          Place negative (black) probe on the ac pin 2 above.
          Write down the result ohms

          Place positive (red) probe on the ac pin. 3 above
          Place negative (black) probe on the - pin 4 above.
          Write down the result ohms

          Place positive (red) probe on the - pin. 4 above
          Place negative (black) probe on the ac pin 3 above.
          Write down the result. ohms

          You can cut and paste the above and write in your results
          Last edited by selldoor; 11-17-2012, 03:19 AM.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment


            #25
            Re: Phillips 37PF5521D dead after power cut

            yesi have 240v mains in and though fuse, on the bridge i am only getting a reading of 240v if i put one probe in the mains in and the other to the 2 or 3 pin. if i go on pins 2 and 3 i get o volts the above test all show OL on the meter

            Comment


              #26
              Re: Phillips 37PF5521D dead after power cut

              Bridge is probably shot - remove and test again off board.
              Try the test on the bridge you already removed?
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment


                #27
                Re: Phillips 37PF5521D dead after power cut

                Bridge rectifiers very rarely fail open, the fuse would blow if the bridge was bad. I suspect because the relay isn't clicking over you're not seeing the right voltages. Does the TV click when plugged in? Since it is dead, it will probably not. There is a second small bridge for standby and audio.
                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


                  #28
                  Re: Phillips 37PF5521D dead after power cut

                  no clicking on the relay, no standby light,i will look at the standby board bridge , i still cannot get my head around the voltages on the power board why do i not read a voltage across the feed to the standby board without an incoming voltage there will be no output to feed the relay or am i just not getting this

                  Comment


                    #29
                    Re: Phillips 37PF5521D dead after power cut

                    The rectified, unswitched AC comes onto the "AUDIO STANDBY" board to provide audio power and standby power. It also looks like that board has the audio amplifier on it. I would suspect this board or the AC being supplied to it if you've got no power at all.
                    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


                      #30
                      Re: Phillips 37PF5521D dead after power cut

                      If you disconnect the cables from the PS to the standby are there any voltages on the PS. Care - high voltage.
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment


                        #31
                        Re: Phillips 37PF5521D dead after power cut

                        voltage at link plug with plug pulled 9.5v ac across the two pins, i read on a post with these two boards that the output should be up around 70v ac

                        Comment


                          #32
                          Re: Phillips 37PF5521D dead after power cut

                          It should be DC volts around 325V, measured across the pins, not relative to chassis. I assume the fuse next to it is OK.
                          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


                            #33
                            Re: Phillips 37PF5521D dead after power cut

                            yes fuse is good ,i have change the 10uf 450v cap by the fuse and the two 10uf 450v caps on the input to the standby board

                            Comment


                              #34
                              Re: Phillips 37PF5521D dead after power cut

                              Did you check the resistor Budm referred to
                              Please upload pictures using attachment function when ask for help on the repair
                              http://www.badcaps.net/forum/showthread.php?t=39740

                              Comment


                                #35
                                Re: Phillips 37PF5521D dead after power cut

                                yes i have already replaced it with a 470 ohm

                                Comment


                                  #36
                                  Re: Phillips 37PF5521D dead after power cut

                                  What is the chassis code for this TV e.g. LC4.1ED. It will be written on rear of unit. Usually on main sticker. I have got 32" version service manual.
                                  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


                                    #37
                                    Re: Phillips 37PF5521D dead after power cut

                                    Just checked and the SM I have is good for 37" too.
                                    http://www.tgohome.com/ServiceManual...&Search=Submit

                                    Page 12 has a useful block diagram, you should have 325V across that small bridge rectfier and going into STBY board. STBY board then provides relay signal to turn on rest of PSU.
                                    Last edited by tom66; 11-17-2012, 05:58 AM.
                                    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


                                      #38
                                      Re: Phillips 37PF5521D dead after power cut

                                      Can you post a picture of the back of the power board - we seem to be going around in circles - Id have thought the mains voltage should appear at the bridge even if the
                                      relay was not working - perhaps Tom can confirm?.
                                      My understanding is the resistance test on the bridge should give readings one way and off scale the other. perhaps do the test again but use the diode setting.
                                      Please upload pictures using attachment function when ask for help on the repair
                                      http://www.badcaps.net/forum/showthread.php?t=39740

                                      Comment


                                        #39
                                        Re: Phillips 37PF5521D dead after power cut

                                        Relay switches in power to the big bridge on the heatsink. Rest of PSU is dead until that clicks over. And that will only click over on signal from main board, which uses standby power. I'll bet somehow the standby PSU isn't working. The block diagram simplifies it all.
                                        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


                                          #40
                                          Re: Phillips 37PF5521D dead after power cut

                                          thanks again for your help with this, if you wish i will post photo off the under side of power board

                                          Comment

                                          Working...
                                          X