Announcement

Collapse
No announcement yet.

High voltage inverter capacitors

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    High voltage inverter capacitors

    Hello, I was wondering if anyone had a failed capacitor on the output of the inverter transformer? My transformer gets way too hot even with other tubes which I know work fine and the capacitors are connected in parallel to the transformer output. If anyone has experience on this please reply.

    #2
    Re: High voltage inverter capacitors

    You are talking about the Ceramic ballast cap, the small high Voltage blue cap rated around 3K ~ 5KV?
    They do fail and will show leakage resistance or just shorted out, it will be hard to test using simple Ohm meter because the working Voltage the caps is exposed to is from 500 ~ 2KV or more.
    You have to inverter transformers, correct? If that is the cased you can then just swap the caps over and see if the problem will follow.
    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


      #3
      Re: High voltage inverter capacitors

      I have one transformer for both CCFL tubes. And yes i'm talking about those blue 3pf 6kv capacitors. I measured it using an lcr meter but the resistance Is around 3 M ohm. My transformer is heating up even with working tubes on the output so it must be something in between.
      I am also studying the schematic of the inverter circuit but the only things that could fail to make it this hot are two SMD ceramic 4,7uF/25 volt caps.

      Comment


        #4
        Re: High voltage inverter capacitors

        If you have low value capacitors on this board it probably would not hurt to replace them
        9 PC LCD Monitor
        6 LCD Flat Screen TV
        30 Desk Top Switching Power Supply
        10 Battery Charger Switching Power Supply for Power Tool
        6 18v Lithium Battery Power Boards for Tool Battery Packs
        1 XBox 360 Switching Power Supply and M Board
        25 Servo Drives 220/460 3 Phase
        6 De-soldering Station Switching Power Supply 1 Power Supply
        1 Dell Mother Board
        15 Computer Power Supply
        1 HP Printer Supply & Control Board * lighting finished it *


        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
        2 Hem Saw Computer Stack Board

        All of these had CAPs POOF
        All of the mosfet that are taken out by bad caps

        Comment

        Working...
        X