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LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

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    #1

    LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

    Can just say hello all great site you have, i have the above tv which is stuck in stand by mode looked on alot of websites and researched this tv first of all i thought it was a power supply board fault but replaced the power board still the same problem is there but the tv boots up when i disconnect the Z sustain board does anyone know or have any idea what the problem may be? i would be grateful for any help i can get as the mrs is gonna kill me if i keep spending money on it lol
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    #2
    Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

    Obviously there are a fault in the Z-SUS board, since the powersupply operates normally without it. Examine the area around the big heatsink. Under that heatsink there are a so called IPM, a hybrid integrated circuit, a very common failure on both Z-SUS and Y-SUS boards.

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      #3
      Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

      Originally posted by micktodd View Post
      Can just say hello all great site you have, i have the above tv which is stuck in stand by mode looked on alot of websites and researched this tv first of all i thought it was a power supply board fault but replaced the power board still the same problem is there but the tv boots up when i disconnect the Z sustain board does anyone know or have any idea what the problem may be? i would be grateful for any help i can get as the mrs is gonna kill me if i keep spending money on it lol
      The problem is probably the Z-Sustain board. The standard troubleshooting procedure for a 'won't power up' problem with these sets is to unplug the power cable to the Z sustain and try turning it on. If it doesn't turn on, reconnect the Z-sustain and disconnect the power cable to the Y-Sustain and try again. If it does turn on (of course, there won't be a picture), replace whichever Sustain board caused the problem.

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

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        #4
        Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

        Thank you very much for you quick reply ive checked the z sustain board appears ok but i have found this on another board are these blown ?
        Attached Files

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          #5
          Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

          Originally posted by micktodd View Post
          Thank you very much for you quick reply ive checked the z sustain board appears ok but i have found this on another board are these blown ?
          Probably not. That's a plastic disk covering the top of the cap. They often bulge. If you can press it flat with your finger the cap isn't bulged.

          PlainBill
          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

          Comment

            #6
            Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

            Yep my mistake should read up about it

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              #7
              Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

              Rechecked the z sustain board and found a capacitor that was not working so hopefully when i replace it the tv will work again .
              Attached Files

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                #8
                Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

                Originally posted by micktodd View Post
                found a capacitor that was not working
                What do you mean by not working? Is it shorted? Does it have high ESR?
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                  #9
                  Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

                  The MOSFET's/IPM on the Z sustain board are probably shorted. You can check this by putting an ohm meter across the 190V and ground supply at the power connector on the board. If it's low it's shorted.

                  I'm replacing a Y sustain board on a Samsung for the same reason, shorted MOSFET's on this one; even though the PSU fired up and provided power to the board which in turn opened the fuse on the board. I was going to replace the MOSFET's but I figure that the rest of the board might be suspect too.
                  Soundcraft CPS-450 and CPS-550 (Rebuilds - Completed!)
                  Samsung PS42V6S - in repair (New Y-SUS Board Completed)
                  Philips 32PFL7782D/05 - in repair (PSU or Main Board - Selling)

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                    #10
                    Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

                    yep the IPM are at fault just waying up if worth the cost was first told that it was the power suply board so bought 1 them which is now spare loll and z board gonna cost between 40-100 so may just see if can pick up a tv with cracked screen not put me off trying to fix it thought and will buy another fix up once this one is done .
                    and thank you all for your great help

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                      #11
                      Re: LG MZ-42PZ44 42" Plasma Television (stuck in stadby)

                      Yea, see the thing is a lot of people think that when a Plasma/LCD dont work it's the PSU when there's plenty to go wrong.

                      Look at the Z sus board closely for a part number and post it here.

                      I've got a feeling that a brand ne LG board will be less than a ton.

                      EDIT:

                      Your right. This is a brand new one here...
                      Last edited by Remeniz; 02-01-2011, 03:14 PM.
                      Soundcraft CPS-450 and CPS-550 (Rebuilds - Completed!)
                      Samsung PS42V6S - in repair (New Y-SUS Board Completed)
                      Philips 32PFL7782D/05 - in repair (PSU or Main Board - Selling)

                      Comment

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