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Samsung LN26B360 Flashing Backlight

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    #21
    Re: Samsung LN26B360 Flashing Backlight

    Found this:
    http://www.buy-transistors.com/a393f.html

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      #22
      Re: Samsung LN26B360 Flashing Backlight

      I tried resoldering all of the inverter transformer pins and no change.

      I measured PIN 1 again. It stays at 1.19V the entire time the TV is on regardless of the back light. When I turn off the TV it drops to 0.04V.

      I have attached a few photos of the main/logicboard. I attempted to follow PIN1 but it seems to be attached to one of the internal layers on the logicboard as there are no traces or VIAs for it.

      I found a point on the logicboard called "T1.2V" perhaps this is where the 1.19V is coming from that I am getting on the POWER ON/OFF

      .
      Attached Files

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        #23
        Re: Samsung LN26B360 Flashing Backlight

        Originally posted by devnull View Post
        I found a point on the logicboard called "T1.2V" perhaps this is where the 1.19V is coming from that I am getting on the POWER ON/OFF.
        T1.2V sounds like a test point so 1.19V is probably the correct voltage. I don't have years of industry experience so it just seemed like an odd voltage.
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          #24
          Re: Samsung LN26B360 Flashing Backlight

          I have seen this half lit lamps symptom before, it can be that the Inverter is not putting out enough voltage to drive the tubes or it has too much load due to bad/leaking ballast caps (small blues caps, 10pf 10kV). You should do the Ohm test on those caps out off circuits using the highest Ohm range on the meter since cap can breakdown when over 1000V is applied to them, your meter does not put out enough voltage fo testing these caps but at least you can tell if it has any resistance reading at all, it should read open circuits.
          See example here:
          http://s807.photobucket.com/albums/y...nt%20FLX-3210/
          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

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            #25
            Re: Samsung LN26B360 Flashing Backlight

            Thanks for the advice. I guess my next step would be to just go through and start replacing all the through hole caps.

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              #26
              Re: Samsung LN26B360 Flashing Backlight

              I have just finished replacing all of the ballast caps as well as all of the electrolytic through hole caps and it has made no difference, I am still getting the "flashing" backlight. Does anyone have any suggestions on what I should try next?

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