Mitsubishi Projection TV Loses Sync

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • snielson
    New Member
    • Jul 2011
    • 3
    #1

    Mitsubishi Projection TV Loses Sync

    I have a Mitsubishi WS-65613 TV that has developed a problem. After the TV is on for a while it will suddenly appear to lose horizontal sync. Actually I could be wrong on that. The pitcture just becomes a mess. So far we have been able to fix the problem by turning the TV off and right back on again. We don't even have to wait for anything to cool down.

    That right there has me a little puzzled. It seems problems often get better as they warm up.

    Once the picture goes bad it doesn't matter which input I put the TV on.

    This is not the commong cap problem on the DM board that causes the blinking light issue. I fixed that a number of years ago. I replaced the 4 caps and it has been good until now.

    I have looked things over and so far I don't see any obvious bulging or leaking capacitors.

    As my test equipment is limited, I'm having trouble getting a heading on this problem. I'm not sure if I'm chasing the power supply issue or something on the signal board. Or, one of the other several boards.

    I do have the schematics.

    I have fixed several TV's in my life, but I admit I'm very much a rookie. Does anybody have some suggestions?
    Tags: None
    • Derek23
      Member
      • Apr 2008
      • 33
      #2
      Re: Mitsubishi Projection TV Loses Sync

      I had that problem on some CRT TVs and were caused by bad caps (with leakage but looking fine even if they aren't lytics) on horizontal section on TV (those near the flyback and h transistor).
      regards

        Comment

        • snielson
          New Member
          • Jul 2011
          • 3
          #3
          Re: Mitsubishi Projection TV Loses Sync

          I didn't look much in the deflection end of the frame. It sounds like I need to check out the horizontal down there.

          I managed to get a picture of what I'm seeing. Definitly a horizontal scroll. It took a few attempts with a slower exposure to capture it.

          Thanks.
          Attached Files

            Comment

            • Krankshaft
              Badcaps Legend
              • Jan 2007
              • 2328
              • USA
              #4
              Re: Mitsubishi Projection TV Loses Sync

              I'd still check for bad caps on the power supply, in the horizontal drive section (the circuitry connected to the primary of the horizontal drive transformer), and caps on the horizontal output with an ESR meter.

              I have had plenty of TVs with bad caps that showed no external signs of failure.

              An Orion made set comes to mind it had a bunch of low temperature 85c Rubycons with high ESR causing all kinds of problems on the set. The caps were fine but the rated temperature was too low they got replaced with 105c Panasonics.
              Last edited by Krankshaft; 07-31-2011, 01:42 AM.
              Elements of the past and the future combining to make something not quite as good as either.

                Comment

                • snielson
                  New Member
                  • Jul 2011
                  • 3
                  #5
                  Re: Mitsubishi Projection TV Loses Sync

                  It did turn out to be caps on the horizontal output section. I pulled checked and replaced 5 caps. The only one that really tested bad was C5A10 which is a 100uf cap right next to a large heat sink and transistor.

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • Ihandyrepair
                      Samsung QN70Q6DTA Ghost or horizontal lines after tape fix horizontal line
                      by Ihandyrepair
                      Hi guys

                      I just started fixing 4k TV few months ago. so I am still learning a lot
                      I got this tv from friend complaint is ghosting or horizontal lines on image.

                      never saw the original symptom but I took the tv back home. the funny part is that after bringing to home, the tv worked fine no issue for 3 weeks.
                      then it started to show the ghosting white image.
                      I started using the tape method, but this tv does not have a T con board and it has only 1 ribbon cable from main board to the tv panel.
                      it has 3 thin small boards at the bottom of the...
                      12-05-2022, 04:18 PM
                    • mrsith
                      Samsung UE70TU7100 - flickering horizontal lines
                      by mrsith
                      Hello again good souls.

                      Got an UE70TU7100. The TV starts up just fine, but right hand side of the screen is horizontal striped a bit, and there are some flickering horizontal lines on the whole length of the screen. I've seen similar static horizontal lines sometimes, when applying the cut tape method and covering wrong number of pins.

                      I've cleaned every connector with ipa, tried cut tape method on main LVDS ribbon as well as small ribbons, connecting the panel boards at the bottom. Tried squeezing the bezel and playing around COFs, but no reaction at all. COFs and...
                      02-13-2023, 05:36 AM
                    • fredtred
                      Physically bending the T-Con board creates horizontal dotted lines on OLED55CXPUA
                      by fredtred
                      Hello!
                      I have been trying to solve this issue the past 12 months to no avail. I have been a lurker here during that time but finally decided to post my problem and see if anybody knows a solution.

                      Problem
                      My tv (OLED55CXPUA) has an issue where it displays horizonal lines of dotted artifacts.

                      (See Attachment 1)

                      Self Diagnosing
                      After a very long troubleshooting period I traced the issue to the T-Con board. If I gently flexed/bend the board I could make the display go from GOOD to BAD and vice versa. I have ruled out the connectors/wires...
                      10-29-2023, 01:09 PM
                    • grimacelord
                      PS4 CUH-2115B Slim All Controllers Do Not Sync By Bluetooth or USB
                      by grimacelord
                      Hello. I have a PS4 Slim model number CUH-2115B that is having a problem with syncing any controller by USB and Bluetooth. Every controller I have tried will not sync, and I know that the controllers will sync fine to another PS4, so it's not a controller problem. I have tried 5 different USB cables and 3 different controllers and none of them sync to this PS4, but will on others.

                      The USB ports on the PS4 is delivering 5V power and does charge the controllers (I checked with an USB ammeter).

                      The controllers also do not work in Safe Mode. I understand that if they...
                      08-08-2022, 09:04 AM
                    • PNI E.
                      Tv grundig 50vlx21ldl horizontal colored limes
                      by PNI E.
                      Good morning guys, I have this tv that have horizontal colored lines ( green, blue, black). I tried to disconnect the two ribbon cable on the t con, first the left side and then the right side. But the lines still are there…so I tried the tape method but didn’t work. Can someone help me to try to fix this tv. I give you the photo of the panel, and the panel with the left ribbon unplugged and then the right. Thanks for your help...
                      06-11-2025, 09:45 AM
                    • Loading...
                    • No more items.
                    Working...