Technica M32/57G

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • sordids999
    Badcaps Legend
    • May 2013
    • 2149
    • uk

    #1

    Technica M32/57G

    Hello got this tv today no standby light totally dead until I checked voltages,which voltage readings on the psu seem to be all over the place

    Any ideas ?
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Technica M32/57G

    All voltages or only 5VSB?
    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

    • sordids999
      Badcaps Legend
      • May 2013
      • 2149
      • uk

      #3
      Re: Technica M32/57G

      All of them tom

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Technica M32/57G

        OK, try unplugging power connector from main board and check 5V standby again.
        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

        • multimeter
          Badcaps Veteran
          • Jan 2011
          • 739
          • united kingdom

          #5
          Re: Technica M32/57G

          are they stable voltages or fluctuating? stable but off voltage points to caps,fluctuating would point to a output diode,or startup cap
          fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

          ----------------------------------------------
          please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

          Comment

          • sordids999
            Badcaps Legend
            • May 2013
            • 2149
            • uk

            #6
            Re: Technica M32/57G

            No voltages at all

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Technica M32/57G

              You should have at least one standby voltage.
              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

              • sordids999
                Badcaps Legend
                • May 2013
                • 2149
                • uk

                #8
                Re: Technica M32/57G

                fluctuating multimeter

                Comment

                • multimeter
                  Badcaps Veteran
                  • Jan 2011
                  • 739
                  • united kingdom

                  #9
                  Re: Technica M32/57G

                  voltage on main filter cap?,should be around 320 DCV plugged in and power on
                  fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                  ----------------------------------------------
                  please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Technica M32/57G

                    I'd be focusing on the small electrolytics on the power board's primary side - possibly a bad startup capacitor.
                    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

                    • sordids999
                      Badcaps Legend
                      • May 2013
                      • 2149
                      • uk

                      #11
                      Re: Technica M32/57G

                      Sorry my bad

                      +5v= 2.9 steady
                      +5v= 2.9 steady
                      +5v SB =4.1 but fluctuating
                      +5v= 2.9 steady

                      Comment

                      • sordids999
                        Badcaps Legend
                        • May 2013
                        • 2149
                        • uk

                        #12
                        Re: Technica M32/57G

                        Main 450v cap top left of psu reads 395v steady

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Technica M32/57G

                          Can you supply a close up picture of the power supply?
                          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

                          • sordids999
                            Badcaps Legend
                            • May 2013
                            • 2149
                            • uk

                            #14
                            Re: Technica M32/57G

                            Is that ok ?
                            Attached Files

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Technica M32/57G

                              OK, I'd try replacing C27, C2? (C21 maybe, just below C27), C19 and C18.
                              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

                              • sordids999
                                Badcaps Legend
                                • May 2013
                                • 2149
                                • uk

                                #16
                                Re: Technica M32/57G

                                Right replaced c27, c 18, c 19 the red standby light came on then went to blue but cut out again so I then went a changed c21, cs 30 but still the same
                                Last edited by sordids999; 07-27-2014, 02:30 PM.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Technica M32/57G

                                  Do you now have steady 5V standby?
                                  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

                                  • sordids999
                                    Badcaps Legend
                                    • May 2013
                                    • 2149
                                    • uk

                                    #18
                                    Re: Technica M32/57G

                                    ok replaced all these as above still nothing but just turned it back on to test the 5v standby and now its working tv all good
                                    very strange didnt work first time i changed the caps ?

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Technica M32/57G

                                      I'd soak test it for a while - you might have an intermittent fault somewhere.
                                      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

                                      • sordids999
                                        Badcaps Legend
                                        • May 2013
                                        • 2149
                                        • uk

                                        #20
                                        Re: Technica M32/57G

                                        To be fair i run out of 22uf 50v caps so took two from a old board (maybe its them)so ill order some more

                                        but thanks for your help tom again

                                        Comment

                                        Related Topics

                                        Collapse

                                        • tvguy12012012120
                                          Zombie Samsung UN55NU6900F dead / no standby voltage - randomly came to life after hours of troubleshooting then died
                                          by tvguy12012012120
                                          This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.

                                          Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
                                          02-07-2025, 05:13 PM
                                        • fharris1977
                                          Vizio D50u-D1 Dead Set No Standby
                                          by fharris1977
                                          Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated.
                                          12-28-2023, 10:25 AM
                                        • Crystaleyes
                                          Samsung BN44-00259A standby question
                                          by Crystaleyes
                                          Hi all.

                                          I started a thread while back regarding TV power supply standby circuitry as it is something I am not quite on top of.
                                          SMPS theory and function is becoming more familiar, however the standby part is still a bit of a mystery.

                                          Anyway, a friend has this TV with the above mentioned power supply board which has no standby voltage, nor any other voltages leaving the board.
                                          The mains AC comes in fine, gets filtered and rectified with power is on the main filter cap as well as the transformer and drain pins of the ICE3B0665J, but that's it.
                                          ...
                                          08-11-2023, 05:15 AM
                                        • psssst
                                          Yamaha TSX 120 Standby Problem
                                          by psssst
                                          Hello forum. I've recently been given a Yamaha TSX 120 DAB radio and ipod dock. Its working well however when put on standby its using 6.3 watts. The manual states less than 1 watt on standby. I measured this with a plug in monitor which seems accurate with other items. In use it uses around 7.5 watts. Firstly has anyone who owns a similar radio also got a plug in monitor to check if this is normal with this unit? In the first half a second the monitor shows 0.3 watts which I suspect is what it should use but something is switching it to be almost fully powered. I've searched the manual for eco...
                                          03-01-2024, 07:25 AM
                                        • reessi
                                          JSK4228-050 Power Supply Standby voltage changing! (Possible from Wharfedale LTF37K1)
                                          by reessi
                                          Hello,

                                          I am trying to re-purpose this power supply that I saved years ago from a tv with a cracked screen for a monitor but that is not really that relevent at the moment. I do not recall which tv but a google search looks like it is from Wharfedale LTF37K1.

                                          You may notice I made some alterations moving some components to the top and some wires which are from a 5v regulator I fitted to the 12v output as the monitor requires 5v. The standby was already at fault from the beginning, it has nothing to do with the alterations...

                                          Years ago it had some bulging caps...
                                          04-26-2021, 11:42 AM
                                        • Loading...
                                        • No more items.
                                        Working...