LG 60pz750

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  • tvtimmy
    Badcaps Legend
    • Mar 2015
    • 1160
    • usa
    #1

    LG 60pz750

    I just fixed this model, had the cracked solder joints on the coils of both z sus and y sus, with only 3 shorted igbts. I replaced them and another 3 FGPF4633 with 6 gt30j124 (I wanted to try them, overkill but cheap) The main fuse on the z sus was blown also.
    The tv fired right up and I scanned for channels, and all was great. This morning I put a usb drive with a movie on it and it played perfectly. I changed inputs back to tv and no signal on all 42 that I can get!!! Hdmi and the usb port still work.
    I am going to try a firmware update on it, and then maybe a factory reset if needed.
    Has anybody solved this issue? Mainboards are extinct for this set, only repair services from e bay. Will post results.
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: LG 60pz750

      Originally posted by tvtimmy
      I just fixed this model, had the cracked solder joints on the coils of both z sus and y sus, with only 3 shorted igbts. I replaced them and another 3 FGPF4633 with 6 gt30j124 (I wanted to try them, overkill but cheap) The main fuse on the z sus was blown also.
      The tv fired right up and I scanned for channels, and all was great. This morning I put a usb drive with a movie on it and it played perfectly. I changed inputs back to tv and no signal on all 42 that I can get!!! Hdmi and the usb port still work.
      I am going to try a firmware update on it, and then maybe a factory reset if needed.
      Has anybody solved this issue? Mainboards are extinct for this set, only repair services from e bay. Will post results.
      I dunno, $300 bucks gets you a new board.

      https://encompass.com/item/9629263/L...assis_Assembly

      I'd be tempted to reflow or replace the tuner module. I've had a PK750 with a bad one, hardly picked any channels up or displayed bad signal quality, broke up a lot. Replaced the module and fixed. Was not a Sanyo module but could be similar internals

        Comment

        • augiedoggy
          Senior Member
          • Aug 2016
          • 62
          • united states
          #3
          Re: LG 60pz750

          those sets are notorious for having the main chip in the main board fail... you can sometimes get the set to work correctly but heating the chip with a heatgun to troubleshoot but the issue will return unless its repaired... BTW you can get these boards repaired on ebay for like $75...
          #1 issue is a lit up blank screen.

            Comment

            • tvtimmy
              Badcaps Legend
              • Mar 2015
              • 1160
              • usa
              #4
              Re: LG 60pz750

              A reflow of the bga chip did the trick.

                Comment

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