Inverter module thanks to ilikesteel

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #1

    Inverter module thanks to ilikesteel

    ilikesteel found this great unit on the web, it will good for testing the lamps (4), can't beat the price. Cost less than one replacement transformer.
    Attached Files
    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

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809
  • momaka
    master hoarder
    • May 2008
    • 12170
    • Bulgaria

    #2
    Re: Inverter module thanks to ilikesteel

    I was actually thinking of buying an inverter like that for a Philips 190S5 19" LCD monitor that I found recently. Except I was thinking of buying one off of ebay (the Chinese ones on ebay are similarly priced and don't look that bad either). What you posted is probably better, though.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Inverter module thanks to ilikesteel

      They have more on EBAY:
      http://www.ebay.com/sch/i.html?_nkw=...RTER&_osacat=0
      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

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

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

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Inverter module thanks to ilikesteel

        Do these inverters work with just one bulb, or do all four need to be plugged in?
        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

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Inverter module thanks to ilikesteel

          All four lamps have to be good, it uses the same detection to know if the lamps will fire up and stay lit or not. This will just help you narrow down the problem to find out if you have bad lamps or bad inverter board. When I have bad lamps, I will inspect all the lamps any way.
          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

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

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

          Comment

          • momaka
            master hoarder
            • May 2008
            • 12170
            • Bulgaria

            #6
            Re: Inverter module thanks to ilikesteel

            Originally posted by tom66
            Do these inverters work with just one bulb, or do all four need to be plugged in?
            As budm said, all 4 lamps need to be good and plugged in. That said, they do also sell 2-lamp and single-lamp inverters if you need to drive just a single CCFL.

            Looking at close-up pictures at most of these inverters, they seem to be using a push-pull design rather than the old Royer oscillator - and that's good in a way. At least from my observation, push-pull designs are a lot more robust. However, one potential problem they have is that multi-lamp inverters usually drive all CCFLs at once and if one CCFL is bad, the whole inverter shuts down and you cannot disable parts of the inverter to let the other CCFLs run. With Royer oscillator, the most common config is 2 CCFLs/inverter transformer. In a 4-lamp inverter, you can sometimes disable half of the inverter and just use the other half. That's what I did with my Dell E193FPc after it blew the new replacement transistors for the lower inverter despite the transformer joints being good.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Inverter module thanks to ilikesteel

              No body that I know of uses the Royer Oscillator setup any more in their design due to the newer PWM IC, the Oscillator is done inside the IC instead of depending on the Tuned circuits of the output stage with big high voltage tuning caps.
              It is also corrrect that you cannot disable one set of the lamp with this new design as momaka indicated, I did the same on those BenQ designed used in HP and Dell to run just two lamps.
              Funny thing is that I see some of these 22" wide screen Dell and HP are using only TWO lamps! to keep the price down.
              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

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

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

              Comment

              • jetadm123
                Badcaps Legend
                • Feb 2010
                • 2169

                #8
                Re: Inverter module thanks to ilikesteel

                Can't believe the price of these inverters on eBay. And it includes free shipping! Man, if I had a bad ccfl controller chip or inverter transformer I couldn't source, I'd probably try and fit one of these boards into the circuit.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Inverter module thanks to ilikesteel

                  I know, it's cheaper than a replacement transformer! and free shipping!
                  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

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

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

                  Comment

                  • retiredcaps
                    Badcaps Legend
                    • Apr 2010
                    • 9271

                    #10
                    Re: Inverter module thanks to ilikesteel

                    Originally posted by jetadm123
                    Can't believe the price of these inverters on eBay.
                    The inverter transformers, in bulk (50 or 100), go for about $1 each. I have seen them on Chinese websites.
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                    Comment

                    • momaka
                      master hoarder
                      • May 2008
                      • 12170
                      • Bulgaria

                      #11
                      Re: Inverter module thanks to ilikesteel

                      Originally posted by jetadm123
                      Man, if I had a bad ccfl controller chip or inverter transformer I couldn't source, I'd probably try and fit one of these boards into the circuit.
                      I'm actually very tempted to do that right now with my Philips 190S5 19". There's lots of discoloration near the inverter traffo and everything else checks out fine. All it would take is to buy one of these new inverters, dremel away the old inverter off of the power supply PCB and just hook up the new inverter.

                      I think we are slowly falling into slavery to the cheap Chinese electronics. The point where it's cheaper to replace the whole thing than it is to fix it on the component level is nearing.

                      Comment

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