using ATX PSU for TV's?

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  • triplefour
    Badcaps Legend
    • May 2014
    • 1747
    • USA
    #1

    using ATX PSU for TV's?

    the guy i buy TV's from at the E-waste recycler told me that he has sometimes used an ATX power supply instead of the power board to diagnose TV's...

    im sure he's not lying, but is this something we can do safely?

    it makes sense to me since the average PSU for a tv only needs some 5v, 12v , and 24v which you can make just fine with an ATX PC power supply...
    then just a matter of putting the wires in the right places?

    there has to be some major reason why this is a bad idea. please, educate me!
    Don't fear the repair...
    Tags: None
    • shovenose
      Send Doge Memes
      • Aug 2010
      • 6575
      • USA
      #2
      Re: using ATX PSU for TV's?

      Typical ATX PSUs output 3.3V, 5V, and 12V. Not sure how you'd get 24V, though.

        Comment

        • goontron
          5000!
          • Dec 2011
          • 4108
          • US
          #3
          Re: using ATX PSU for TV's?

          Originally posted by shovenose
          Typical ATX PSUs output 3.3V, 5V, and 12V. Not sure how you'd get 24V, though.
          you're forgetting the negative rails....

          -12v + 12v = 24v would have thought you knew that, with how you tried to make your own PSU tester and all.
          Last edited by goontron; 10-11-2014, 08:04 PM.
          Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

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            Comment

            • shovenose
              Send Doge Memes
              • Aug 2010
              • 6575
              • USA
              #4
              Re: using ATX PSU for TV's?

              Originally posted by goontron
              you're forgetting the negative rails....

              -12v + 12v = 24v would have thought you knew that, with how you tried to make your own PSU tester and all.
              lol, no need to be snarky.

              I don't participate in Hardware Insights anymore, so there is no need to have a PSU tester. I thought I was going back into it but after some more thought I realized it was not my passion anymore nor a priority so I ended up not doing it. I would have done it for the money and it doesn't make sense to do something just for money especially because it's not a very good source of income. I can charge $60-120 an hour for managed services or I can spend 4 hours on a review and make a couple bucks selling the PSU afterward - which makes more sense? I still proofread some of the articles and do minor site maintenance over there but that's it.

              Now let's not derail the entire thread, ok? If you have a problem PM me, and I'd be happy to work it out, but this thread doesn't belong to us.
              Last edited by shovenose; 10-11-2014, 08:16 PM.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: using ATX PSU for TV's?

                  Since the -12V and the +12V of the ATX will have common gorund, then for you to make 24V with negative ref to ground for the inverter board, then you will need to lift the ground of the -12V and the +12V ground. The 24V will also have to be rated at about 4~5A for typical inverter board.
                  I am sure you have some TV that is beyond fixing, then you can use the power supply from it for testing.
                  Last edited by budm; 10-11-2014, 08:23 PM.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

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                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • triplefour
                      Badcaps Legend
                      • May 2014
                      • 1747
                      • USA
                      #6
                      Re: using ATX PSU for TV's?

                      yes that probably is the easiest solution...save a working PSU (the more "normal" the better?) from a tv with a broken screen and use that...
                      as long as you rewire it correctly, there shouldnt be any danger to the main board?
                      Don't fear the repair...

                        Comment

                        • Shinju
                          Badcaps Legend
                          • Mar 2014
                          • 1239
                          • USA
                          #7
                          Re: using ATX PSU for TV's?

                          Samsung power supplies are pretty awesome for the fact you can take a ps from one TV and if the mainboard plugs match you can use it to power on another panel.

                          I have done this with a few LCD PS for some Sammy plasmas to trouble shoot mainboard on/off voltages

                            Comment

                            • SteveNielsen
                              Retired Tech
                              • Jun 2012
                              • 2327
                              • USA
                              #8
                              Re: using ATX PSU for TV's?

                              Also the -12v rail won't supply very much current.

                                Comment

                                • Agent24
                                  I see dead caps
                                  • Oct 2007
                                  • 4913
                                  • New Zealand
                                  #9
                                  Re: using ATX PSU for TV's?

                                  Originally posted by SteveNielsen
                                  Also the -12v rail won't supply very much current.
                                  Yeah, usually less than 1 Amp. Most seem to use just an LM7912.
                                  "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                  -David VanHorn

                                    Comment

                                    • c_hegge
                                      Badcaps Legend
                                      • Sep 2009
                                      • 5219
                                      • Australia
                                      #10
                                      Re: using ATX PSU for TV's?

                                      Yes. I was gonna say that. Most PSUs have around 0.5A to 0.8A capacity - not really useful.
                                      I love putting bad caps and flat batteries in fire and watching them explode!!

                                      No wonder it doesn't work! You installed the jumper wires backwards

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