Samsung 591S Clolor Problem

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  • joe6210
    New Member
    • Jun 2009
    • 6

    #1

    Samsung 591S Clolor Problem

    Hi all, first, sorry for poor english.
    I have samsung 591s color problem. when i turn ON ( VGA cable disconnected ) it show Self test mode and the color is ok. VGA card is OK, VGA cable is OK, i check all component in the RGB ( expect IC because i not know how ) and found nothing problem.

    Some illustration : turn on my computer and :
    1) I unplug the RGB cable from the RGB board and it's show black screen.
    2) Plug the red cable to RGB board and it show picture clearly with red color dominan
    3) Unplug red cable, and Plug green cable to RGB board, it show picture clearly with green color dominan
    4) Unplug red cable, and plug the blue cable to RGB board, it show BLUE SCREEN and i cannot see the picture, it's just BLUE SCREEN.

    Please anybody kindly help me.
  • Nama
    Senior Member
    • May 2009
    • 127

    #2
    Re: Samsung 591S Clolor Problem

    Welcome to Badcaps Joe. From reading this forum I have found most people suggest us amateurs taking a CRT to a professional for repair. Many risks are involved when opening a CRT. As much as I like the idea of playing with a electron gun. I would not risk my life. Unless you are 100% comfortable playing with Hi-Voltage. I would look for a new monitor, Good luck, Jacob

    I am not a PRO so make sure you check back and see if anyone else has a better suggestion!.
    ^Learning to walk on rice paper without leaving a trace,

    Comment

    • EGuevarae
      Badcaps Legend
      • Nov 2008
      • 1336
      • USA

      #3
      Re: Samsung 591S Clolor Problem

      Originally posted by Nama
      most people suggest us amateurs taking a CRT to a professional for repair.
      I agree. LCDs are one thing, but CRTs are a different kind of beasts. Maybe Toasty, PlainBill or one of our other seniors could help you, but you must know how to handle things inside a CRT (specially around the flyback) for your own safety. And for a final word: 15" CRT that probably would give you just 14" visually usable is not worth your life (not mine, at least).
      There are 10 kind of people in this world: those that understand binary, and those who don't.
      • ASUS ROG Maximus IX Code
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      Comment

      • PlainBill
        Badcaps Legend
        • Feb 2009
        • 7034
        • USA

        #4
        Re: Samsung 591S Clolor Problem

        Originally posted by joe6210
        Hi all, first, sorry for poor english.
        I have samsung 591s color problem. when i turn ON ( VGA cable disconnected ) it show Self test mode and the color is ok. VGA card is OK, VGA cable is OK, i check all component in the RGB ( expect IC because i not know how ) and found nothing problem.

        Some illustration : turn on my computer and :
        1) I unplug the RGB cable from the RGB board and it's show black screen.
        2) Plug the red cable to RGB board and it show picture clearly with red color dominan
        3) Unplug red cable, and Plug green cable to RGB board, it show picture clearly with green color dominan
        4) Unplug red cable, and plug the blue cable to RGB board, it show BLUE SCREEN and i cannot see the picture, it's just BLUE SCREEN.

        Please anybody kindly help me.
        There are three possible causes of this problem.

        1. The monitor is defective
        2. The VGA card (RGB board) is defective
        3. The cable is defective

        I don't know what kind of signal source you are using, and I can't find much information on the monitor. Most video cards for a PC use a HD-15 connector. Some monitors have 4 or 5 BNC connectors. When used with a PC a HD15 to BNC cable is used. I have also seen video sources with 4 or 5 bnc connectors.

        You have already done a very good job of troubleshooting. Your tests show that the CRT itself is working properly, and that the red and green signals are getting through.

        Test 1: Hook the blue input of the monitor to the red signal source. If you get a picture with blue dominant the problem is in the blue signal from the RGB board (or the cable supplying the signal) . If you get a blue screen with no picture the problem is in the monitor (or the cable carrying the signal).

        Test 2. Try a different cable, monitor, or video source.

        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

        • Krankshaft
          Badcaps Legend
          • Jan 2007
          • 2328
          • USA

          #5
          Re: Samsung 591S Clolor Problem

          So you're using BNC connectors?

          In other words Red, Green, and Blue, connectors and a sync connector?
          Last edited by Krankshaft; 06-03-2009, 05:46 PM.
          Elements of the past and the future combining to make something not quite as good as either.

          Comment

          • Krankshaft
            Badcaps Legend
            • Jan 2007
            • 2328
            • USA

            #6
            Re: Samsung 591S Clolor Problem

            Follow Bill's suggestion if the problem isn't in the cable then it's in the blue signal path.

            A service manual will be a must here to trace the faulty component out. It's probably in the signal processing section.

            If the blue wasn't normal during the self test I'd say Heater to Cathode short but since it's normal during the self test that's out the window.
            Elements of the past and the future combining to make something not quite as good as either.

            Comment

            • joe6210
              New Member
              • Jun 2009
              • 6

              #7
              Re: Samsung 591S Clolor Problem

              Thanks for all. I'm use D-SUB 15 pin VGA connector, but not BNC connector to the RGB. I have plug the Blue Cable to the red or green pin and get picture clearly. Plug the green or red cable to the BLUE pin and the result is BLUE SCREEN. The VGA cable is good, i have checked it.

              Comment

              • joe6210
                New Member
                • Jun 2009
                • 6

                #8
                Re: Samsung 591S Clolor Problem

                Thanks for all. I'm use D-SUB 15 pin VGA connector, but not BNC connector to the RGB, it's 6 pin in 1 socket to RGB( i don't know what type of this connector ). This monitor use LB15V MAIN and RGB Board, i have the Schematic Diagram. Like Mr Plainbill suggestion, i plug the Blue Cable to the red or green pin and get picture clearly. Plug the green or red cable to the blue pin and the result is BLUE SCREEN. The VGA cable is good, i have checked it. The CRT is good because when entering Setting Menu from monitor, the color is perfect.

                Comment

                • PlainBill
                  Badcaps Legend
                  • Feb 2009
                  • 7034
                  • USA

                  #9
                  Re: Samsung 591S Clolor Problem

                  Originally posted by joe6210
                  Thanks for all. I'm use D-SUB 15 pin VGA connector, but not BNC connector to the RGB, it's 6 pin in 1 socket to RGB( i don't know what type of this connector ). This monitor use LB15V MAIN and RGB Board, i have the Schematic Diagram. Like Mr Plainbill suggestion, i plug the Blue Cable to the red or green pin and get picture clearly. Plug the green or red cable to the blue pin and the result is BLUE SCREEN. The VGA cable is good, i have checked it. The CRT is good because when entering Setting Menu from monitor, the color is perfect.
                  Your explanation makes it clearer. If it isn't the monitor or the cable, the problem is the video card.

                  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

                  • joe6210
                    New Member
                    • Jun 2009
                    • 6

                    #10
                    Re: Samsung 591S Clolor Problem

                    Sori, maybe we have some misconception, i mean that i'm plug the Blue Cable to the red or green pin ( at RGB Board ) and get picture clearly. Plug the green or red cable to the blue pin at RGB board and the result is BLUE SCREEN. I have been try this monitor with others computer and the result is same. So my prediction that the problem is at RGB board, please you all professional can tell me how repair the RGB board, what should i replace? Thanks...

                    Comment

                    • EGuevarae
                      Badcaps Legend
                      • Nov 2008
                      • 1336
                      • USA

                      #11
                      Re: Samsung 591S Clolor Problem

                      Originally posted by joe6210
                      Sori, maybe we have some misconception, i mean that i'm plug the Blue Cable to the red or green pin ( at RGB Board ) and get picture clearly. Plug the green or red cable to the blue pin at RGB board and the result is BLUE SCREEN. I have been try this monitor with others computer and the result is same. So my prediction that the problem is at RGB board, please you all professional can tell me how repair the RGB board, what should i replace? Thanks...
                      If you insist, post a pic to get the help you want. As I've told you, one of our senior members would jump in with some good idea after seeing a pic.
                      Good luck
                      There are 10 kind of people in this world: those that understand binary, and those who don't.
                      • ASUS ROG Maximus IX Code
                      • Intel Core i5-7600K 3.8GHz
                      • 16gb GSKILL TridentZ RGB DDR4-3200
                      • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                      • Windows 10 Pro x64
                      • GeForce GT1050
                        2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                      Comment

                      • joe6210
                        New Member
                        • Jun 2009
                        • 6

                        #12
                        Re: Samsung 591S Clolor Problem

                        Screen shot :












                        Attached Files

                        Comment

                        • kc8adu
                          Super Moderator
                          • Nov 2003
                          • 8829
                          • U.S.A!

                          #13
                          Re: Samsung 591S Clolor Problem

                          did this happen suddenly?
                          the windows screen looks almost normal but it might be the pic.
                          if the self test looks good and shows all 3 colors and makes good white the issue is before the main video amps.
                          bad solder joints and dried out caps are high on the list of suspects.
                          if this has a blue label samsung crt just toss it now and save your time and parts.
                          between the bad crt's and the unobtanium calogic video amps these things were turds.

                          Comment

                          • dmbj
                            Member
                            • May 2009
                            • 23

                            #14
                            Re: Samsung 591S Clolor Problem

                            +1
                            Originally posted by kc8adu
                            did this happen suddenly?
                            bad solder joints and dried out caps are high on the list of suspects.

                            also you could have a shorted yoke.

                            Comment

                            • Wizard
                              Badcaps Legend
                              • Mar 2008
                              • 2296

                              #15
                              Re: Samsung 591S Clolor Problem

                              Wow, you did a troubleshooting method, by swapping signals! That's awesome, we'd hire you on the spot.

                              Now, That TELLS us the blue section lost control most of voltage (full railed to 90V or so) on CRT board (particularly 90V supply for this to amp IC but anywhere in the blue circuit paths). Go there and check resistors and transistors. Also change capacitors if this is older design. Newer monitors use two ICs design (one to inject OSD and pass through signal to the main amp IC) to drive all 3 guns. But the usual process of checking resistance, transistor and measuring voltage applies with DMM.

                              Note the newer monitors microcontroller now talk to the IC and IC itself on the CRT generate the details to make OSD and pass to the amp IC is recent design in last 8 years. Not the older LM1203 style. It's found in junky monitors.

                              Cheers, Wizard
                              Last edited by Wizard; 06-04-2009, 08:39 AM.

                              Comment

                              • PlainBill
                                Badcaps Legend
                                • Feb 2009
                                • 7034
                                • USA

                                #16
                                Re: Samsung 591S Clolor Problem

                                Originally posted by Wizard
                                Wow, you did a troubleshooting method, by swapping signals! That's awesome, we'd hire you on the spot.

                                Now, That TELLS us the blue section lost control most of voltage (full railed to 90V or so) on CRT board (particularly 90V supply for this to amp IC but anywhere in the blue circuit paths). Go there and check resistors and transistors. Also change capacitors if this is older design. Newer monitors use two ICs design (one to inject OSD and pass through signal to the main amp IC) to drive all 3 guns. But the usual process of checking resistance, transistor and measuring voltage applies with DMM.

                                Note the newer monitors microcontroller now talk to the IC and IC itself on the CRT generate the details to make OSD and pass to the amp IC is recent design in last 8 years. Not the older LM1203 style. It's found in junky monitors.

                                Cheers, Wizard
                                Wizard, note this:
                                Originally posted by joe6210
                                I have samsung 591s color problem. when i turn ON ( VGA cable disconnected ) it show Self test mode and the color is ok. VGA card is OK, VGA cable is OK, i check all component in the RGB ( expect IC because i not know how ) and found nothing problem.
                                NOW I understand the 'RGB board' is the board on the monitor. And yes, I concur, very good job of troubleshooting.

                                Joe, what is the part number of the IC on the RGB board?

                                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

                                • joe6210
                                  New Member
                                  • Jun 2009
                                  • 6

                                  #17
                                  Re: Samsung 591S Clolor Problem

                                  there are 3 ic in the RGB board:
                                  1. LM1236 (RGB Preamplifier)
                                  2. LM2470 (Monolithic Triple 7.0 ns CRT Driver)
                                  3. LM2480 (80V Triple Bias Clamp)

                                  Comment

                                  • kc8adu
                                    Super Moderator
                                    • Nov 2003
                                    • 8829
                                    • U.S.A!

                                    #18
                                    Re: Samsung 591S Clolor Problem

                                    Originally posted by dmbj
                                    +1



                                    also you could have a shorted yoke.
                                    also you are dead wrong.yoke has nothing to do with a missing color.
                                    looks to me that the bias(dc level) is correct but the ac(video) is missing.
                                    since osd is fine its not the output stage.poking around with a scope i would find this fault in 30 seconds.

                                    Comment

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