Sylvania LC320SLX No Power-Dead

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Sylvania LC320SLX No Power-Dead

    What do you get at pin 3 of T601?
    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

    • kevinm34232
      Badcaps Legend
      • May 2012
      • 1884
      • USA

      #22
      Re: Sylvania LC320SLX No Power-Dead

      Think I may have found something. Figured I check this group of resistors.

      R604 tests open
      R605 and R606 test good .392-.395
      R614 the large resistor test 0.000?

      R604-606 RES CARBON FILM T 1/4W J 390k Ω
      R614 METAL OXIDE FILM RES. 2W J 0.39 Ω

      Could R604 be the problem? What about reading on R614?
      Attached Files
      Last edited by kevinm34232; 07-17-2012, 10:14 PM.

      Comment

      • kevinm34232
        Badcaps Legend
        • May 2012
        • 1884
        • USA

        #23
        Re: Sylvania LC320SLX No Power-Dead

        Let me resolder them and Ill check.

        Comment

        • kevinm34232
          Badcaps Legend
          • May 2012
          • 1884
          • USA

          #24
          Re: Sylvania LC320SLX No Power-Dead

          Originally posted by budm
          What do you get at pin 3 of T601?
          If I'm checking correctly 2.9v

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: Sylvania LC320SLX No Power-Dead

            From the SCH, the line voltage is fed to L601, L602, then it goes to 4 Diodes D601~604 bridge setup, the + output feeds R602, 603, 617 then the output feeds pin3 of the T601.
            So check all those connections of all those component, and the resistors.
            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

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #26
              Re: Sylvania LC320SLX No Power-Dead

              Originally posted by kevinm34232
              Also what would be a good resistor for discharging large capacitors? Or is there another way?
              Modern capacitors have a resistor built in which normally discharges them in less than a minute. If you want to check to make sure just test the voltage with your meter - observe the polarity.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: Sylvania LC320SLX No Power-Dead

                Originally posted by selldoor
                Modern capacitors have a resistor built in which normally discharges them in less than a minute. If you want to check to make sure just test the voltage with your meter - observe the polarity.
                This isn't true... I know myself having touched plenty of caps and gotten plenty of shocks... They will self discharge slowly but it can take days.
                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

                • selldoor
                  Slow Learner
                  • Dec 2010
                  • 7870

                  #28
                  Re: Sylvania LC320SLX No Power-Dead

                  Originally posted by tom66
                  This isn't true... I know myself having touched plenty of caps and gotten plenty of shocks... They will self discharge slowly but it can take days.
                  Hmm? well I did say to check? - I do on BIG caps if im in a hurry and am pleased to say I have never been shocked at least not by a cap.

                  Anyway to answer the question as asked- it is all in here
                  http://www.repairfaq.org/sam/captest.htm#ctsdc
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment

                  • kevinm34232
                    Badcaps Legend
                    • May 2012
                    • 1884
                    • USA

                    #29
                    Re: Sylvania LC320SLX No Power-Dead

                    This main on this cap definetely stays charged for awhile I found out when one of the pins touched the chassis

                    Anyway I heard about using a resisitor to discharge them, or a 100w light bulb, just curious what you all do..

                    Back to the TV as I said above, it seems R604 is bad although I haven't checked everything, could that one cause TV not to turn on?

                    Comment

                    • RON_CET
                      Badcaps Veteran
                      • Jun 2012
                      • 217
                      • USA

                      #30
                      Re: Sylvania LC320SLX No Power-Dead

                      yes if R604 is open it will stop set from powering ON, FYI i use a 680 ohm 1 watt to discharge most caps.
                      Ron Driver,BSEE,CET,ISCET,NESDA

                      Comment

                      • kevinm34232
                        Badcaps Legend
                        • May 2012
                        • 1884
                        • USA

                        #31
                        Re: Sylvania LC320SLX No Power-Dead

                        OK Ill try that. Also Im curious why the large resistor (R614 METAL OXIDE FILM RES. 2W J 0.39 Ω) gives me a resistance reading of 0.000?

                        Comment

                        • RON_CET
                          Badcaps Veteran
                          • Jun 2012
                          • 217
                          • USA

                          #32
                          Re: Sylvania LC320SLX No Power-Dead

                          R614 if you are reading this in circuit your going to read just like short due to one side is connected to ground,but what i do is remove one side of R614 to read and you should get about .3 ohms also the zener diodes there D608,D610,D612 should not read shorted to ground in circuit
                          Ron Driver,BSEE,CET,ISCET,NESDA

                          Comment

                          • kevinm34232
                            Badcaps Legend
                            • May 2012
                            • 1884
                            • USA

                            #33
                            Re: Sylvania LC320SLX No Power-Dead

                            I pulled 1 leg of all the resistors and R614 still read 0.000

                            Comment

                            • RON_CET
                              Badcaps Veteran
                              • Jun 2012
                              • 217
                              • USA

                              #34
                              Re: Sylvania LC320SLX No Power-Dead

                              how accurate is your dvm? also you do have a tolorance factor but either way you should read .39 ohms plus/minus i say 10% out of circuit
                              Ron Driver,BSEE,CET,ISCET,NESDA

                              Comment

                              • kevinm34232
                                Badcaps Legend
                                • May 2012
                                • 1884
                                • USA

                                #35
                                Re: Sylvania LC320SLX No Power-Dead

                                Well now Im not sure how accurate it is, it's an Ideal Digital Multimeter, model ND 3267-1.
                                I'm definetely not getting a reading on that resistor but the other ones were very close so I don't know.

                                Maybe it is my meter the lower resistance ones seem to be the problem Ill have to try to change batteries first. In any case that one R604 is the only one that looks open so I will try replacing that and report back. Thanks!
                                Last edited by kevinm34232; 07-18-2012, 08:43 PM.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: Sylvania LC320SLX No Power-Dead

                                  You know, pin 3 of that T601 was reading 2.9V as indicated in post 24, that power supply section is an always on, so if you got the shock from that large cap, then that reading of 2.9V cannot be right.
                                  Attached Files
                                  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

                                  • RON_CET
                                    Badcaps Veteran
                                    • Jun 2012
                                    • 217
                                    • USA

                                    #37
                                    Re: Sylvania LC320SLX No Power-Dead

                                    agreed budm cuase that voltage should be around 135 volts DC
                                    Ron Driver,BSEE,CET,ISCET,NESDA

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #38
                                      Re: Sylvania LC320SLX No Power-Dead

                                      I have feeling his meter is not working right.
                                      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

                                      • kevinm34232
                                        Badcaps Legend
                                        • May 2012
                                        • 1884
                                        • USA

                                        #39
                                        Re: Sylvania LC320SLX No Power-Dead

                                        You're right Bud but not my meter, the main fuse FH601 is blown, must have happened with the spark...

                                        At Pin 3 of T601 get 166v
                                        Last edited by kevinm34232; 07-18-2012, 09:16 PM.

                                        Comment

                                        • kevinm34232
                                          Badcaps Legend
                                          • May 2012
                                          • 1884
                                          • USA

                                          #40
                                          Re: Sylvania LC320SLX No Power-Dead

                                          You said I should be getting 135v is something wrong if Im getting around 165v which is what Im getting off of large cap?

                                          Comment

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