Samsung 930b LCD cold start problem (inverter?)

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  • alexanna
    Member
    • Mar 2010
    • 1346

    #101
    Re: Samsung 930b LCD cold start problem (inverter?)

    Originally posted by rico_st
    Ok!
    I conected videoboard and power board (without lamps and panel) video cable to pc and turn on pc and monitor and measured On/Off 2.37v, A-Dim 0.01v.
    Is that ok?
    It would be a good idea to see if the BL on/off voltage is making its way down to the backlight controller, and it is the correct voltage.
    Can you read a number on the 16 pin back light controller?
    Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

    Comment

    • rico_st
      Member
      • Nov 2010
      • 10

      #102
      Re: Samsung 930b LCD cold start problem (inverter?)

      Originally posted by alexanna
      It would be a good idea to see if the BL on/off voltage is making its way down to the backlight controller, and it is the correct voltage.
      Can you read a number on the 16 pin back light controller?
      Hi!
      Im not very good in electronic to track it to the controller.
      Not shure but i think writes something like BIT31956 FMF17 60511

      Comment

      • alexanna
        Member
        • Mar 2010
        • 1346

        #103
        Re: Samsung 930b LCD cold start problem (inverter?)

        Originally posted by rico_st
        Hi!
        Im not very good in electronic to track it to the controller.
        Not shure but i think writes something like BIT31956 FMF17 60511
        I am unable to find a data sheet on the controller; if a data sheet could be located it should be very easy.
        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

        Comment

        • PlainBill
          Badcaps Legend
          • Feb 2009
          • 7034
          • USA

          #104
          Re: Samsung 930b LCD cold start problem (inverter?)

          Originally posted by alexanna
          I am unable to find a data sheet on the controller; if a data sheet could be located it should be very easy.
          I believe that's a BIT3195 or BIT3195G.

          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

          • rico_st
            Member
            • Nov 2010
            • 10

            #105
            Re: Samsung 930b LCD cold start problem (inverter?)

            Originally posted by PlainBill
            I believe that's a BIT3195 or BIT3195G.

            PlainBill
            It is BIT3195G

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA

              #106
              Re: Samsung 930b LCD cold start problem (inverter?)

              Originally posted by rico_st
              It is BIT3195G
              Thanks for the confirmation. About the only way to get the pinout is to find a schematic of a monitor that uses one. There are service manuals for various Samsung monitors on Elektrotanya.

              PlainBill
              Last edited by PlainBill; 06-12-2011, 07:05 AM.
              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

              • DragonfisT
                New Member
                • Jul 2011
                • 1

                #107
                Re: Samsung 930b LCD cold start problem (inverter?)

                this thread saved my monitor also, I would like to thank you for this nice explanation to a commen problem, I have never soldered before but I could easily do it because of this thread, thanks for keeping it alive!
                Last edited by DragonfisT; 07-21-2011, 08:21 PM.

                Comment

                • yerbamate
                  New Member
                  • Aug 2011
                  • 2

                  #108
                  Re: Samsung 930b LCD cold start problem (inverter?)

                  I had a similar problem with my Samsung 930B as well. Before doing any work neither the lcd or the backlight was working. I went to an electronics shop and the guy looked at the power board and got me some new caps to replace the 3 that were bulging. I didn't check that they exactly matched the old ones.

                  After soldering them on though, I noticed that the voltage was not the same on the new ones (old caps 820 mcf/25V, new 820 mcf/16V). However now the LCD works but the backlight still does not. Anyone have any ideas? Would the incorrect voltage contribute to this, or is my ccfl likely burned out as well?

                  Attached are pictures from after the 3 caps were replaced. The new caps are the 3 green/gold ones.

                  http://s1112.photobucket.com/albums/...amsung%20930B/

                  Thanks for any assistance in advance.

                  Comment

                  • PlainBill
                    Badcaps Legend
                    • Feb 2009
                    • 7034
                    • USA

                    #109
                    Re: Samsung 930b LCD cold start problem (inverter?)

                    Originally posted by yerbamate
                    I had a similar problem with my Samsung 930B as well. Before doing any work neither the lcd or the backlight was working. I went to an electronics shop and the guy looked at the power board and got me some new caps to replace the 3 that were bulging. I didn't check that they exactly matched the old ones.

                    After soldering them on though, I noticed that the voltage was not the same on the new ones (old caps 820 mcf/25V, new 820 mcf/16V). However now the LCD works but the backlight still does not. Anyone have any ideas? Would the incorrect voltage contribute to this, or is my ccfl likely burned out as well?

                    Attached are pictures from after the 3 caps were replaced. The new caps are the 3 green/gold ones.

                    http://s1112.photobucket.com/albums/...amsung%20930B/

                    Thanks for any assistance in advance.
                    For a number of reasons, many people here will not attempt to view pictures hosted offsite. Attach them using 'Manage Attachments' - below the text entry area.

                    Going down in voltage is always a bad idea. I figure that the guys who designed it didn't want to spend a dime more than necessary and the particular voltage was chosen for a reason.

                    Generally, results buying caps form a 'brick and mortar' store yields very poor results. In most cases the staff has no concept of the importance of using low ESR caps, and take more interest in collecting payment than filling the customers needs.

                    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

                    • jetadm123
                      Badcaps Legend
                      • Feb 2010
                      • 2169

                      #110
                      Re: Samsung 930b LCD cold start problem (inverter?)

                      Originally posted by yerbamate
                      I had a similar problem with my Samsung 930B as well. Before doing any work neither the lcd or the backlight was working. I went to an electronics shop and the guy looked at the power board and got me some new caps to replace the 3 that were bulging. I didn't check that they exactly matched the old ones.

                      After soldering them on though, I noticed that the voltage was not the same on the new ones (old caps 820 mcf/25V, new 820 mcf/16V). However now the LCD works but the backlight still does not. Anyone have any ideas? Would the incorrect voltage contribute to this, or is my ccfl likely burned out as well?

                      Attached are pictures from after the 3 caps were replaced. The new caps are the 3 green/gold ones.

                      http://s1112.photobucket.com/albums/...amsung%20930B/

                      Thanks for any assistance in advance.
                      I believe the outputs for this power supply is both 5V and 13V (it probabaly stamped on the board itself). However, the 13V is not a regulated output and can go as high as 16-18V. Therefore, using 16V caps is not a good thing because they will heat up quickly and dry out. As for the backlight, on some of these boards, a fuse F301 was used for the inverter section. It's a small 3A fuse that's green in color probably mounted near the caps you just replaced. It may be covered by white glue. Check to see if it's open.

                      Comment

                      • EGuevarae
                        Badcaps Legend
                        • Nov 2008
                        • 1336
                        • USA

                        #111
                        Re: Samsung 930b LCD cold start problem (inverter?)

                        Originally posted by jetadm123
                        As for the backlight, on some of these boards, a fuse F301 was used for the inverter section. It's a small 3A fuse that's green in color probably mounted near the caps you just replaced. It may be covered by white glue. Check to see if it's open.
                        Exactly. Check that one, as it tends to go out often, at least in the units I've seen...
                        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

                        • yerbamate
                          New Member
                          • Aug 2011
                          • 2

                          #112
                          Re: Samsung 930b LCD cold start problem (inverter?)

                          Ok thanks all for the feedback. I knew the incorrect voltage caps were not a good idea, but I figured it was mostly for the reason that they would burn out very quickly as opposed to not working at all. If I can get this working, I will absolutely change them. I will check again for the fuse, I tried to look in that area but could not see the code f301, however that section had a lot of glue on it, so I'll look closer. Thanks again for the responses.

                          Comment

                          • Chyenne
                            Member
                            • May 2011
                            • 14

                            #113
                            Re: Samsung 930b LCD cold start problem (inverter?)

                            Got to repair a 930bf a few days ago. Symptoms upon turning it on were no reaction but the rapidly blinking led as well. Changing all caps on the power board, except the big one, fixed it. They looked as good as new. Has been working ever since. Thanks again badcaps forum!

                            Comment

                            • stealthhit
                              New Member
                              • Jan 2012
                              • 3

                              #114
                              Re: Samsung 930b LCD cold start problem (inverter?)

                              Okay So I am a newbie. I have a samsung 930b. I get the rapid blinking power LED no button functions. I have done some testing and I am in a cross roads as to what I should do next. If I disconnect the video cable to the monitor I gain control of the buttons. The backlights come on and the screen is white. I know it's no suprise with the white but here is what has me dumbfounded when the cable for the screen is connected the I get just the blinking LED. Any help would be appreciated and I will get some pictures of the boards. Thank you for all the Help in Advance..

                              Comment

                              • stealthhit
                                New Member
                                • Jan 2012
                                • 3

                                #115
                                Re: Samsung 930b LCD cold start problem (inverter?)

                                Okay so I got the pictures. I hope to get this fixxed nothing like a free 19" monitor. Well my picture upload Failed.

                                Comment

                                • stealthhit
                                  New Member
                                  • Jan 2012
                                  • 3

                                  #116
                                  Re: Samsung 930b LCD cold start problem (inverter?)

                                  Well bright side is I am still mentally challanged. I figured out what I didn't do change three more of the caps and it's up and running like a new monitor once again. Thank you every one for all the great knowledge on this thread and on this forum..

                                  Comment

                                  • nesmrten
                                    New Member
                                    • Jan 2012
                                    • 2

                                    #117
                                    Re: Samsung 930b LCD cold start problem (inverter?)

                                    Originally posted by gypsy
                                    That fixed it! Bright as daylight and stable too. I reclaimed a $250 piece of hardware, thank you so much for the detailed advice and taking the time to look at my board =)


                                    What part did you change? i have same problem please help...


                                    Regards from Slovenia

                                    Comment

                                    • PlainBill
                                      Badcaps Legend
                                      • Feb 2009
                                      • 7034
                                      • USA

                                      #118
                                      Re: Samsung 930b LCD cold start problem (inverter?)

                                      Originally posted by nesmrten
                                      What part did you change? i have same problem please help...


                                      Regards from Slovenia
                                      The inverter fuse. See about step 24 or 25 and follow the same steps.

                                      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

                                      • grape8pe
                                        New Member
                                        • Oct 2012
                                        • 1
                                        • United States

                                        #119
                                        Re: Samsung 930b LCD cold start problem (inverter?)

                                        I just wanted to post a huge THANK YOU to everyone who has posted on this forum. With the advice of gdement I replaced the bad caps of my Samsung 930b and it now works flawlessly! Here's the BOM from mouser.com. You guys rock!

                                        X1
                                        Mfr. #: UVY2W101MHD
                                        Desc.: Aluminum Electrolytic Capacitors - Leaded 450volts 100uF 18x40 20% .5LS

                                        X1
                                        Mfr. #: EKY-250ELL470ME11D
                                        Desc.: Aluminum Electrolytic Capacitors - Leaded 25volts 47uF 5X11

                                        X1
                                        Mfr. #: ESW477M025AH2AA
                                        Desc.: Aluminum Electrolytic Capacitors - Leaded 25volts 470uF 20%

                                        X2
                                        Mfr. #: EKMG250ETD102MJ20S
                                        Desc.: Aluminum Electrolytic Capacitors - Leaded 25volts 1000uF 10X20

                                        X2
                                        Mfr. #: EKZE160ETD102MJ20S
                                        Desc.: Aluminum Electrolytic Capacitors - Leaded 16volts 1000uF 10X20

                                        Total Cost was $11.82

                                        Comment

                                        • k1r2
                                          New Member
                                          • Apr 2013
                                          • 2
                                          • USA

                                          #120
                                          Re: Samsung 930b LCD cold start problem (inverter?)

                                          Bad caps are still plaguing things in 2013, I have the same Samsung 930b, same problem....
                                          Did they really think he would give them the entire formula??? :/

                                          Comment

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