Emerson LC401EM2F

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  • Mark369
    Senior Member
    • Jul 2009
    • 163

    #1

    Emerson LC401EM2F

    I have an Emerson 40" LCD TV that stopped working. I removed the back panel and noticed the 8A 250V fuse near the AC input was open.

    I found that D606 is shoted in circuit do you think this would cause the main fuse to open?

    I found the drawings for this power board.

    Thanks for your help.

  • Pentium4
    CapXon Be Gone
    • Sep 2011
    • 3741
    • USA

    #2
    Re: Emerson LC401EM2F

    Yeah I think that would cause the fuse to open, can you post some pictures of the boards?

    Comment

    • Mark369
      Senior Member
      • Jul 2009
      • 163

      #3
      Re: Emerson LC401EM2F

      no pictures yet. but it looks like this.






      Thanks for quick reply

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Emerson LC401EM2F

        Do you have the diagram in PDF format? it is no focus enough to read the part designators.
        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

        • Mark369
          Senior Member
          • Jul 2009
          • 163

          #5
          Re: Emerson LC401EM2F

          yea

          Comment

          • Mark369
            Senior Member
            • Jul 2009
            • 163

            #6
            Re: Emerson LC401EM2F

            try this.





            Comment

            • Mark369
              Senior Member
              • Jul 2009
              • 163

              #7
              Re: Emerson LC401EM2F

              ok up loaded pdfs to large to attach full pdf.
              Attached Files

              Comment

              • Mr Bill
                Badcaps Veteran
                • Nov 2011
                • 648
                • USA

                #8
                Re: Emerson LC401EM2F

                I had a sylvania 42" that 1 diode was shorted and the main fuse was blown. I replaced the diode and fuse and the tv came to life. A friend of mine has the tv right now and as far as i know it's still working. It's been about 4 months now. So you might just need to replace the diode and the fuse and be back in business.

                Comment

                • Mark369
                  Senior Member
                  • Jul 2009
                  • 163

                  #9
                  Re: Emerson LC401EM2F

                  this is a zener diode to ground as far as i can tell does that make a diff

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Emerson LC401EM2F

                    Is it d606 or d1606?
                    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

                    • Mark369
                      Senior Member
                      • Jul 2009
                      • 163

                      #11
                      Re: Emerson LC401EM2F

                      i dont konw much about electronics. so what would that mean?

                      Comment

                      • Mark369
                        Senior Member
                        • Jul 2009
                        • 163

                        #12
                        Re: Emerson LC401EM2F

                        iv fixed about 6 lcd monitors just like caps and a voltage regalter

                        Comment

                        • Pentium4
                          CapXon Be Gone
                          • Sep 2011
                          • 3741
                          • USA

                          #13
                          Re: Emerson LC401EM2F

                          Originally posted by Mark369
                          i dont konw much about electronics. so what would that mean?
                          What Diode that's shorted has D606 or D1606 next to its leads

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Emerson LC401EM2F

                            That D606 Zener is in parallel with Source resistor for Q601 R609 (0.75 Ohm) that is why is shows shorted.
                            Last edited by budm; 11-29-2012, 10:42 PM.
                            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

                            • Mark369
                              Senior Member
                              • Jul 2009
                              • 163

                              #15
                              Re: Emerson LC401EM2F

                              ok that would make sence. i guss i will remove D1201, 1202, 1203 and 2104 and test.

                              they all show open but it is the bridge from what i can tell maybe one or more are part open and shorting and blowing fuse.

                              Comment

                              • Mark369
                                Senior Member
                                • Jul 2009
                                • 163

                                #16
                                Re: Emerson LC401EM2F

                                how do you check for leakage

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Emerson LC401EM2F

                                  OK, discharge c1612 (150uf 450v) first, then take the resistance reading across that cap to see if it shows anything less than 100 Ohms, we are looking to see if you have shorted load which will be in parallel with the cap.
                                  You also have two set of the bridge circuits, the diode you removed earlier are for the standby power supply, second set of the rectifier (D1607~1609) is for the main power that feeds the PFC circuit.
                                  You should also check surge protector SA1601 to see if it shows shorted.
                                  Last edited by budm; 11-29-2012, 10:50 PM.
                                  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

                                  • Mark369
                                    Senior Member
                                    • Jul 2009
                                    • 163

                                    #18
                                    Re: Emerson LC401EM2F

                                    c1612 on my blue esr meter it shows .33 in the board and on my dmm on the 20M setting it starts at 2.2 and then goes down. sa1601 reads 2.62 on 20M setting and it looks like a blue ballast capacitor i see in lcd smps

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Emerson LC401EM2F

                                      Note with these self-oscillating supplies, ANY short on the output (secondary) will blow the primary fuse. There is very limited short circuit protection.
                                      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

                                      • Mark369
                                        Senior Member
                                        • Jul 2009
                                        • 163

                                        #20
                                        Re: Emerson LC401EM2F

                                        so from my readings do we know if c1612 is good or do i have to lift a leg

                                        Comment

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