Panasonic Viera TH50PZ85U Buzzing (No Picture)

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • evilocity
    New Member
    • Jul 2013
    • 4
    • United States

    #1

    Panasonic Viera TH50PZ85U Buzzing (No Picture)

    Hello,

    I have a Panasonic Viera TH50PZ85U that I inherited from a client that asked me to fix it. I told him that I don't have enough experience with television repair to offer him any real guarantee of anything, and such I would not feel comfortable charging him for a repair. Upon this news, he simply gave it to me.

    I tell you that, because I want you to know that I have zero knowledge of the backstory. I do know that he recently moved and it worked before the move.

    What I have tried / Noticed

    There is an INTENSE buzzing that SEEMS to be coming from the bottom right corner (from the back) of the unit. It's a strange, two-toned electric hum that varies in intensity. I have also noted that it appears to die down momentarily if you change inputs using the back panel, but immediately drones again once the input has been selected.

    I note that the power light comes on red and stays lit.
    Removing the back panel, I note that both SC and SS board LED are lit green.
    Removing the A5 connector does nothing for the issue and does not display the white screen.
    I have tightened all screws and verified all connectors are seated, even going so far as to reseat several of them.

    My gut feeling at this point is that it is in fact a failed panel, and no further troubleshooting will help, it is simply a land-fill piece.

    I would sincerely appreciate anyone elses input on this, and am more than willing to provide whatever you would like.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

    Intense buzzing is very, very likely to be a cracked plasma panel. This would not be a repairable issue.

    https://www.youtube.com/watch?v=-iAm82lhky4&t=1m10s

    Sorry for the bad news...
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • evilocity
      New Member
      • Jul 2013
      • 4
      • United States

      #3
      Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

      That is the EXACT sound this unit is making. Ah well, easy come, easy go.

      Thank you for your prompt reply

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

        At the very least, the parts are worth a fair bit -- probably $100 or so if you are prepared to strip it out yourself, and $20 to $50 to a private seller doing so themselves. Putting the parts on the market instead of scrapping the set will help improve parts availability (since manufacturers rarely sell them to the public.)
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • R_J
          Badcaps Legend
          • Jun 2012
          • 9587
          • Canada

          #5
          Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

          Does it sound somthing like this. http://www.youtube.com/watch?v=-iAm82lhky4

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

            See above, OP agreed it did.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • evilocity
              New Member
              • Jul 2013
              • 4
              • United States

              #7
              Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

              Is it safe to assume the diagnostic lights are telling the truth? No really foolproof way to test all of these parts. I'm no stranger to selling things as-is on ebay and the like if that's what you recommend at this stage.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Panasonic Viera TH50PZ85U Buzzing (No Picture)

                I would sell them cheap as untested, but since you hear that buzzing, it's more than likely everything is OK.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                Related Topics

                Collapse

                • FZG
                  Panasonic AG-1000B VHS player with bad picture quality
                  by FZG
                  Hello!

                  I recently got an old VHS player from Panasonic and just for fun I want to try to repair this device. It is an AG-1000B portable VHS player from 1990 and it has a problem with picture quality in playback mode.

                  Picture in playback mode is very noisy and often loses sync but the still images are nearly perfect.

                  I want to know, is this something that could be solved by recapping or is the video head likely gone?

                  Also, what mechanism is this?

                  Any feedback is appreciated!...
                  05-06-2024, 07:16 AM
                • Bazfletch3
                  Panasonic TH-65FX800A backlight LED's working but picture is very dark
                  by Bazfletch3
                  Hi all

                  While I have quite a decent background in electrical & electronic troubleshooting & repairs, this is my first time stripping down an LCD TV for repair.... I have inherited a 3yr old Panasonic LCD which has a picture, but it is quite dark (too dark to be watchable - but still quite easy to see; I didnt need a torch to see it).

                  I started by checking and trying to adjust all of the picture and backlighting levels, but that made little to no difference. I also did a factory reset.

                  From there I envisaged that the backlighting wasn't working, however...
                  01-08-2024, 10:18 PM
                • Tr0ll
                  T-con suspect issue. Both ribbon cables no picture. One ribbon cable ok. (58pus8545)
                  by Tr0ll
                  Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.

                  The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.

                  Original T-con:
                  Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.

                  First replacement T-con:

                  I thought it might be t-con and ordered new t-con from china(supposedly tested)...
                  10-07-2023, 07:48 PM
                • JJAAMM
                  SAMSUNG UN55KS9000F picture fades then distorts into vertical lines after 20 seconds
                  by JJAAMM
                  This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.

                  Problem
                  TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode...
                  07-06-2023, 06:01 AM
                • mar1in
                  Panasonic TH-55AS670A no picture no sound
                  by mar1in
                  Hi everyone,

                  I've got this Panasonic TV here with the following symptoms:

                  * Standby Light is solid RED
                  * Turning on using the Button on the TV (long press) would change LED to blinking GREEN
                  * After a couple of seconds, LED is solid GREEN and without picture or sound.

                  I've tried a couple of things before tearing it apart:

                  * Resetting using various combinations of powerbutton and volume buttons pressing down while booting.
                  * Activating Self Check according to service manual using IR Blaster (we have no remote unfortunately)...
                  09-10-2023, 11:10 PM
                • Loading...
                • No more items.
                Working...