Announcement

Collapse
No announcement yet.

42PFL7422D LG Inverter Modification II v1.2

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    42PFL7422D LG Inverter Modification II v1.2

    I want to install the inverter board mod, but looking at the LG inverter mod II v1.2 pdf, It doesn't seem clear which way to install the zener diodes. Can anyone tell me, are they showing that there is a polarity mark on the board at the pads to install the zeners? I don't want to do it wrong and install them backwards.

    Thanks,

    electrodog
    Attached Files
    Tags: None
    #2
    Re: 42PFL7422D LG Inverter Modification II v1.2

    The 33V Zener Diode is connected between B+ (24V) and Ground on the board, the Band on the Diode will be connected to the Positive and the other end will be connected to ground. Just post the pictures so I can redline them for you.
    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: 42PFL7422D LG Inverter Modification II v1.2

      May I ask about the origin and purpose of this modification?
      "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

      -Leonid Brezhnev (On the Yom Kippur War)

      Comment

        #4
        Re: 42PFL7422D LG Inverter Modification II v1.2

        LG/Philips released the first MOD which still did not fix the blown up IC and MOSFETs on the inverter boards, so they released the II fix, only time will tell if it will truly fix the problem.
        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

          #5
          Re: 42PFL7422D LG Inverter Modification II v1.2

          budm,

          If you look at the inverter mod II document SCC_73709 page 13, you'll see arrows pointing to the pads. Are the arrows where the anode gets placed on the pads? They describe: Polarity: band mark position and non polarity: no placing direction. Should I solder the anodes to the pads where the arrows point? I just want to make sure since I don't have a schematic.

          Thanks,

          electrodog

          Comment

          Previous template Next
          Working...
          X