42lg30-ua lcd inverters

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • cadiman
    Badcaps Veteran
    • Mar 2010
    • 397
    #1

    42lg30-ua lcd inverters

    I just picked up this 42" lcd 2008 model 42lg30-ua.
    It has an inverter problem. There is a master and a slave inverter and I am not sure how these work together. I am going to remove and test the transformers.

    Looking for some insight on this design and have read you should change in pairs.

    Thanks!
    Tags: None
    • thelmores
      Member
      • Feb 2011
      • 17
      #2
      Re: 42lg30-ua lcd inverters

      This will help you ensure that is is the inverters, and not a power supply problem. Normally the only thing I will attempt to repair on inverters is the capacitors. If they are puffy or bulged.

      Other than that, you normally just replace the inverters.......

      I have just changed one inverter before, but it is a risk. If you can, best to change both.

      http://www.google.com/search?q=VIT71...a69e3db245d910

      http://www.google.com/search?q=VIT71...a69e3db245d910




      Hope this helps!

        Comment

        • cadiman
          Badcaps Veteran
          • Mar 2010
          • 397
          #3
          Re: 42lg30-ua lcd inverters

          Nice! I found a shorted transister and a blown surface mount fuse on the slave inverter.
          I have 24v to the board... power supply is good.

          The master inverter fires up and I do get backlight for a few seconds.
          I removed all transformers and checked primary and secondary and all were good/same.

          I am going to replace the fuse and transister and it should be good to go I hope.

          Thanks for the info and the feedback!

            Comment

            Previous template Next

            Related Topics

            Collapse
            • x_orange90_x
              Vizio E55-E1 bad backlights or bad inverter?
              by x_orange90_x
              I just got this tv today and it appeared to have no backlight on. After taking off the rear cover and checking again in the dark I can see that MAYBE one quadrant is lit.. But still it's quite dim. I was going to check the LEDs with my tester, and I found LED 1 and LED 2 + pins on the wire from the inverter, but I couldn't identify a ground. Nonetheless I tried using a mounting screw on the inverter board and also the chassis as ground but regardless my tester reads 300 which is what it reads when there is no voltage draw.

              I don't know how exactly to test the inverter itself. Is it...
              01-29-2025, 09:24 PM
            • Gentian
              APSINT3636VR 3600W APS INT Series 36V DC 230V AC Inverter/Charger schematic
              by Gentian
              I have a tripp-lite aspint 3636vr inverter charger which blow some of mosfet transistors. I replaced them repaired also the driver circuit and tested but the mosfets burn again.

              It work very well as inverter and also as charger if I let the rear switch in auto mode (inverter) and charger only(charging) but in auto when I connect the feed line 220V AC first time it pass ok to line and start charging the batteries but when I remove the feed line it pass to inverter mode and if I do it again the second time when passing from charging to inverter the Main transformer start making a...
              03-06-2023, 07:07 AM
            • valvashon
              Insignia NS-LCD19-09 (PS OK, Inverter problem?)
              by valvashon
              For some reason I'm just not going to let this 19" TV defeat me. I guess because I have a schematic to work from I feel like I'm oh so close.

              History- while adding a turn-on circuit I let a small screw roll under the power board. Worked through all of that circuitry, probably replacing a MOSFET and PWM controller that were not bad but I was following the service manual. Finally figured out that the power supply is in working order when the inverter section (for the backlights) is disconnected. When the +12 supply to the inverter is disconnected the +12 and +5 will come up...
              1 Photo
              01-04-2024, 01:44 PM
            • eccerr0r
              A modified sine wave inverter + a grid tie inverter?
              by eccerr0r
              If I had a solar fed grid tie inverter (GTI), a modified sine wave inverter, and a power outage occurred, what would happen if you disconnected mains, backfed the modified sinewave inverter (MSI) into house power, and hooked up the GTI to the output of the MSI, would it work?

              Next thing is trying to charge the batteries using solar power, but that's another issue ...
              08-31-2023, 09:14 PM
            • caseyjay_48
              Sony KDL-46BX450 Inverter Troubleshoot Logic
              by caseyjay_48
              I am currently on a troubleshoot of 46” Sony KDL-46BX450 tv. I came back from Washington to Texas on medical emergency and had to leave all my tools up there. All I have is a couple of screwdrivers and a dvm. I wish to ask the community a troubleshooting question. Please forgive stupid questions as meds I am taking produce brain fog.
              I have well maintained Sony KDL-46BX450. It went black one day. After turn-on, I get solid green light and Sony logo in screen center for about 1-2 seconds, then black. No blinking LEDs, no hissing. Flashlight test shows screen characters dimly viewable,...
              09-23-2022, 08:08 PM
            • Loading...
            • No more items.
            Working...