Samsung LNT4069FX/XAA no picture with sound

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  • ceconomon
    Senior Member
    • Oct 2011
    • 67
    • USA
    #41
    Re: Samsung LNT4069FX/XAA no picture with sound

    The P/N of the adjustable regulator is:
    37302WU
    0735

    I'll have to find some scrap resistors to complete the test.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA
        #42
        Re: Samsung LNT4069FX/XAA no picture with sound

        Just use two 100 Ohms resistors since the regulator needs minimum 10mA load current.
        One resistor between output pin and the adj pin, another resistor between adj pin and Ground, this setup should make the output voltage to be about 2.5V.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • momaka
            master hoarder
            • May 2008
            • 12164
            • Bulgaria
            #43
            Re: Samsung LNT4069FX/XAA no picture with sound

            Originally posted by ceconomon
            I cleaned the back of the mainboard with alcohol. I've examined that area throughly with a magnifying glass and I can't determine the source of that mess. It looks like flux to me. Here are the new pictures.

            All of the ferrite beads tested good.
            Looks okay now, although there is quite a bit of heat discoloration from those linear regulators. I hope it's not a BGA issue. I'll wait until you confirm with the others that all of the regulators are good.

              Comment

              • retiredcaps
                Badcaps Legend
                • Apr 2010
                • 9271
                #44
                Re: Samsung LNT4069FX/XAA no picture with sound

                Originally posted by momaka
                The last thing I can think of is if some of those caps next to those voltage regulators have gone bad due to the excessive heat. But for that you'll need to have an ESR meter to check them with.
                That might be C104. It might just be easier to replace it and retest.
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                  Comment

                  • ceconomon
                    Senior Member
                    • Oct 2011
                    • 67
                    • USA
                    #45
                    Re: Samsung LNT4069FX/XAA no picture with sound

                    I got the resistors today and wired the test up. The results are below:

                    pin1 2.99
                    pin2 2.99
                    pin3 0 GND
                    pin4 2.461
                    pin5 1.235

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA
                        #46
                        Re: Samsung LNT4069FX/XAA no picture with sound

                        You only using 3V power supply to feed this LDO? I am surprised it works pretty good since the input and out difference is only about 0.5V, they usually require the input voltage to be ~1.5 to 1.75V above the required output voltage.
                        But any how, this regulator is good, use 5V power supply next time for testing.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • retiredcaps
                            Badcaps Legend
                            • Apr 2010
                            • 9271
                            #47
                            Re: Samsung LNT4069FX/XAA no picture with sound

                            Originally posted by budm
                            You only using 3V power supply to feed this LDO?
                            When the LDO is "on board", the input voltage is only 3.415V so I suggested using 2 AA in series (as per post #22).
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                            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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                              Comment

                              • retiredcaps
                                Badcaps Legend
                                • Apr 2010
                                • 9271
                                #48
                                Re: Samsung LNT4069FX/XAA no picture with sound

                                What is the DC voltage across C104? Black probe on negative and red probe on positive.
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                                  Comment

                                  • ceconomon
                                    Senior Member
                                    • Oct 2011
                                    • 67
                                    • USA
                                    #49
                                    Re: Samsung LNT4069FX/XAA no picture with sound

                                    C104 measures 1.836V

                                      Comment

                                      • ceconomon
                                        Senior Member
                                        • Oct 2011
                                        • 67
                                        • USA
                                        #50
                                        Re: Samsung LNT4069FX/XAA no picture with sound

                                        I checked for voltage on every capacitor on this board(negative to ground and positive on each cap). I have voltage on all but two caps. The ones right next to the regulator that I replaced (C188 and C192).

                                        Location C188
                                        V1011
                                        100
                                        16J

                                        Location C192
                                        7e (glad I have a 20x magnifying glass)
                                        22
                                        16J

                                          Comment

                                          • retiredcaps
                                            Badcaps Legend
                                            • Apr 2010
                                            • 9271
                                            #51
                                            Re: Samsung LNT4069FX/XAA no picture with sound

                                            Originally posted by ceconomon
                                            C104 measures 1.836V
                                            C104 could be bad. Unless you have an ESR meter and a multimeter than can measure capacitance, I suggest replacing it.
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                                            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                            Please do not post inline and offsite as they slow down the loading of pages.

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                                              Comment

                                              • ceconomon
                                                Senior Member
                                                • Oct 2011
                                                • 67
                                                • USA
                                                #52
                                                Re: Samsung LNT4069FX/XAA no picture with sound

                                                I don't have an ESR meter, so I'll replace it.

                                                Is this a 22uf and a 100uf 16V capacitor? I'll order both so my order is more than the shipping.

                                                Location - C104
                                                V1011
                                                100
                                                16J
                                                looks like 6.6mm x 6.6mm
                                                http://www.digikey.com/product-detai...0-1-ND/2533877


                                                Location C188
                                                7e
                                                22
                                                16j
                                                looks like 5.3mm x 5.3mm
                                                http://www.digikey.com/product-detai...8-1-ND/3438962

                                                  Comment

                                                  • retiredcaps
                                                    Badcaps Legend
                                                    • Apr 2010
                                                    • 9271
                                                    #53
                                                    Re: Samsung LNT4069FX/XAA no picture with sound

                                                    Originally posted by ceconomon

                                                    Location - C104
                                                    V1011
                                                    100
                                                    16J
                                                    looks like 6.6mm x 6.6mm
                                                    http://www.digikey.com/product-detai...0-1-ND/2533877


                                                    Location C188
                                                    7e
                                                    22
                                                    16j
                                                    looks like 5.3mm x 5.3mm
                                                    http://www.digikey.com/product-detai...8-1-ND/3438962
                                                    Those look correct. Normally, when these caps go bad, they blow the top dramatically.
                                                    --- begin sig file ---

                                                    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                                                    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                                                    Please do not post inline and offsite as they slow down the loading of pages.

                                                    --- end sig file ---

                                                      Comment

                                                      • ceconomon
                                                        Senior Member
                                                        • Oct 2011
                                                        • 67
                                                        • USA
                                                        #54
                                                        Re: Samsung LNT4069FX/XAA no picture with sound

                                                        To bring everyone up to speed on this repair...

                                                        I tried replacing the cap and there was no change. I was still lacking any voltage on C188 and C192.

                                                        I was able to pick up a used board on ebay for $26. I would have like to fixed it at the component level, but sometimes it's not worth the battle.

                                                        Thanks for everyone's help.


                                                        3 TV's repaired and I'm looking for more.....I've caught the bug.

                                                          Comment

                                                          • momaka
                                                            master hoarder
                                                            • May 2008
                                                            • 12164
                                                            • Bulgaria
                                                            #55
                                                            Re: Samsung LNT4069FX/XAA no picture with sound

                                                            Well, you may not have fixed the original board, but I'm glad that you got the TV running.
                                                            Congrats!

                                                              Comment

                                                              • stinger381
                                                                Member
                                                                • Apr 2013
                                                                • 42
                                                                • USA
                                                                #56
                                                                Re: Samsung LNT4069FX/XAA no picture with sound

                                                                My Television is doing the exact same thing. Samsung sent a rep out and they put a new power board in the TV. I started getting the grey splotches and then the white screen. The tech told me I had a bad main board so I ordered one from Shop Jimmy, no change. So I thought it might be the T-Conn board and replaced that as well. I still get the solid white screen and sound on the TV. I can tell when the TV goes to commercials that the screen is changing as there is a little blink to it. The power light has a slow steady flash to it and never turns green. Any help would be greatly appreciated. Of course Samsung won't even respond to my requests any more. I don't believe the LCD panel is bad. HELP PLEASE!!!

                                                                  Comment

                                                                  • ceconomon
                                                                    Senior Member
                                                                    • Oct 2011
                                                                    • 67
                                                                    • USA
                                                                    #57
                                                                    Re: Samsung LNT4069FX/XAA no picture with sound

                                                                    I replaced the LCD Controller Logic Board to resolve this issue. You can search for these on Ebay. I see two out there for <= $25 shipped.

                                                                    LCD Controller Logic Board BN96-06669A, BN41-00944A

                                                                      Comment

                                                                      • stinger381
                                                                        Member
                                                                        • Apr 2013
                                                                        • 42
                                                                        • USA
                                                                        #58
                                                                        Re: Samsung LNT4069FX/XAA no picture with sound

                                                                        OK thanks so much .... I had already replaced the main board and of course the power board. I even repaired the original power board thinking that it might be the cause. I don't have the skills to do all the testing listed in this post but swapping boards is easy enough.

                                                                          Comment

                                                                          • stinger381
                                                                            Member
                                                                            • Apr 2013
                                                                            • 42
                                                                            • USA
                                                                            #59
                                                                            Re: Samsung LNT4069FX/XAA no picture with sound

                                                                            Thanks again.... I have one on the way and I'll let you know if it solves my problem too!

                                                                              Comment

                                                                              • salongaopm
                                                                                Member
                                                                                • Mar 2013
                                                                                • 13
                                                                                • usa
                                                                                #60
                                                                                Re: Samsung LNT4069FX/XAA no picture with sound

                                                                                Problem is: screen is white and gray with sound. I replaced power supply board, t-con, logic control, main board but still not working. The power/standby led is red and blinking continuously. What could be the problem? I spent too much already trying to fix this TV. Any help will be greatly appreciated. Thanks!

                                                                                  Comment

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