Sony KV_21M1D (BE-4A) image reddish

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  • goodpsusearch
    Badcaps Legend
    • Oct 2009
    • 2850
    • Greece
    #1

    Sony KV_21M1D (BE-4A) image reddish

    I checked all the caps and replaced 4 that had higher esr than normal.

    I checked for cold solder joints and reflowed when necessary.

    I also checked the transistors on the board connected to the neck of the tube and found nothing shorted or open.

    Yet, the image is reddish.. I don't know what to look for and I could really use your experience guys.

    2 photos of the CRT image attached
    Attached Files
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Sony KV_21M1D (BE-4A) image reddish

      I have seen this before, I do not repair CRTs, but I believe the tube is ageing, it is repairable though by tweaking the red level down, but I can't remember where that is done.
      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

        • ben7
          Capaholic
          • Jan 2011
          • 4059
          • USA
          #3
          Re: Sony KV_21M1D (BE-4A) image reddish

          Originally posted by tom66
          I have seen this before, I do not repair CRTs, but I believe the tube is ageing, it is repairable though by tweaking the red level down, but I can't remember where that is done.
          I believe they usually have potentiometers to change the color levels. Sometimes they are outside of the TV, but most of the times (on more modern CRTs) they are inside, and the TV will have to be opened to do this.
          Muh-soggy-knee

            Comment

            • RJARRRPCGP
              Badcaps Legend
              • Jul 2004
              • 6304
              • USA
              #4
              Re: Sony KV_21M1D (BE-4A) image reddish

              Had a 2005 RCA CRT TV look like that. It's in snow out back now! I tried it during early June, 2012.

              And my cold-power-on test failed!

              It would turn off by itself when I turned it on after sitting!

              RCA appears to be crap now. I wouldn't be surprised one little bit if their LCDs are even worse!
              Last edited by RJARRRPCGP; 01-08-2013, 05:28 PM.
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              "¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -Mí mismo

              "There's nothing more unattractive than a chick smoking a cigarette" -Topcat

              "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

              "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

                Comment

                • goodpsusearch
                  Badcaps Legend
                  • Oct 2009
                  • 2850
                  • Greece
                  #5
                  Re: Sony KV_21M1D (BE-4A) image reddish

                  This is the service manual. I could try to change the red levels from the service menu. Are you sure this is a tube problem?
                  Attached Files

                    Comment

                    • RJARRRPCGP
                      Badcaps Legend
                      • Jul 2004
                      • 6304
                      • USA
                      #6
                      Re: Sony KV_21M1D (BE-4A) image reddish

                      Originally posted by goodpsusearch
                      This is the service manual. I could try to change the red levels from the service menu. Are you sure this is a tube problem?
                      I was given a TV that also had the same type of problem, even though the blues mostly looked fine, the red seemed to not affect all areas.

                      I was gonna keep the 2005 RCA CRT TV until I found out that it keeps turning itself off! Just like I pressed the power button!

                      Appears to be a common RCA problem! Once saw a video with the same type of shut down on YouTube, IIRC!

                      Possessed like a daemon's in there!
                      ASRock B550 PG Velocita

                      Ryzen 9 "Vermeer" 5900X

                      32 GB G.Skill RipJaws V F4-3200C16D-32GVR

                      Arc A770 16 GB

                      eVGA Supernova G3 750W

                      Western Digital Black SN850 1TB NVMe SSD

                      Alienware AW3423DWF OLED




                      "¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -Mí mismo

                      "There's nothing more unattractive than a chick smoking a cigarette" -Topcat

                      "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

                      "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

                        Comment

                        • goodpsusearch
                          Badcaps Legend
                          • Oct 2009
                          • 2850
                          • Greece
                          #7
                          Re: Sony KV_21M1D (BE-4A) image reddish

                          Turns out that the green color is dead. I think it is the tube. I tried to correct the image through the service menu, but I can't do much... It is blueish or reddish or both. And the only settings that worked gave really dark/fuzzy image. This TV is not fixable.
                          Attached Files

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