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Emerson LF501EM5F shuts down right after turning on.

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    Emerson LF501EM5F shuts down right after turning on.

    I just bought this tv for $25. Owner was watching tv last Sunday and it turned of. When he turned it on he quickly sees the "emerson" flash on the screen along with this, see picture, then it shuts off.
    Which happens with me also.
    Attached Files
    Last edited by Malachi; 03-06-2016, 07:36 PM.

    #2
    Re: Emerson LF501EM5F shuts down right after turning on.

    sounds like bad EEPROM,

    Comment


      #3
      Re: Emerson LF501EM5F shuts down right after turning on.

      How would that be fixed?

      Comment


        #4
        Re: Emerson LF501EM5F shuts down right after turning on.

        I will post pictures of the back with the boards when I get home from work this afternoon. If that would help.

        Comment


          #5
          Re: Emerson LF501EM5F shuts down right after turning on.

          Here are the pictures.
          I unplugged the led leads from the psu same cycling. With a flashlight I could see it doing the same thing.
          I disconnected the main board same thing minus the writing on the screen.
          Does that help?
          Attached Files
          Last edited by Malachi; 03-07-2016, 03:06 PM.

          Comment


            #6
            Re: Emerson LF501EM5F shuts down right after turning on.

            What happens when you press ok for 3 secs? You could try to reset the EEPROM on the mainboard and see if it's resets or not......

            This can be also a memory problem on the mainboard , only fix is to replace the mainboard.

            https://wiki.samygo.tv/index.php5/Un...y_EEPROM_Reset
            I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

            Comment


              #7
              Re: Emerson LF501EM5F shuts down right after turning on.

              How do I rest the eeprom?
              Holding ok doesn't do anything.

              Comment


                #8
                Re: Emerson LF501EM5F shuts down right after turning on.

                I provided a link. You need to find the EEPROM on the mainboard and short pin 5 and 6.

                There is information on youtube and on this site also.
                I doubt that it will work but that's what you can try!

                In my opinion the memory/eeprom on the mainboard is bad and need to be replaced. A new mainboard will get this tv going again.
                I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                Comment


                  #9
                  Re: Emerson LF501EM5F shuts down right after turning on.

                  Just the power supply board by itself, what DCV do you get at the STBY 3.3V (the test point is on the jumper J151 (ALL 3.3V) close to the black connector CN501 to see if the 3.3V is steady.
                  Did you also test all those black diodes? I.E. D650 and the rest that have the same big body
                  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


                    #10
                    Re: Emerson LF501EM5F shuts down right after turning on.

                    Ok thanks Moreno. I'll check out the video. I have shorted the flash chip on wireless routers to get them out of a boot loop so I could then perform serial recovery.

                    Comment


                      #11
                      Re: Emerson LF501EM5F shuts down right after turning on.

                      Originally posted by budm View Post
                      Just the power supply board by itself, what DCV do you get at the STBY 3.3V (the test point is on the jumper J151 (ALL 3.3V) close to the black connector CN501 to see if the 3.3V is steady.
                      Did you also test all those black diodes? I.E. D650 and the rest that have the same big body
                      I was told about an hour ago that to test any components on a board that they need to be taken off the board.

                      Comment


                        #12
                        Re: Emerson LF501EM5F shuts down right after turning on.

                        You can do the quick DCV test first.
                        As for component testing I.E. you can test them on board first and see if it shows bad reading then you can lift one leg off the board and then test it again.
                        You may want to read this thread also:
                        https://www.badcaps.net/forum/showth...rson+LF501EM5F

                        OP did not follow through.
                        Last edited by budm; 03-07-2016, 03:30 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


                          #13
                          Re: Emerson LF501EM5F shuts down right after turning on.

                          I get 3.277 on j151.
                          Last edited by Malachi; 03-07-2016, 03:31 PM.

                          Comment


                            #14
                            Re: Emerson LF501EM5F shuts down right after turning on.

                            The board is still mounted to the chassis? Black probe on the chassis?
                            OK, you do have Voltage, not 0V as you reported earlier.
                            Last edited by budm; 03-07-2016, 03:36 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


                              #15
                              Re: Emerson LF501EM5F shuts down right after turning on.

                              With my meter on diode mode I get a beep on D607.
                              But testing it the third time it doesn't beep anymore. Same with others.
                              Last edited by Malachi; 03-07-2016, 03:34 PM.

                              Comment


                                #16
                                Re: Emerson LF501EM5F shuts down right after turning on.

                                Originally posted by Malachi View Post
                                I get 3.277 on j151.
                                OK, so you do have Voltage. Is it steady?
                                How about the DCV on jumper J182 (P-ON+21V)
                                J183 (AMP+13V)
                                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


                                  #17
                                  Re: Emerson LF501EM5F shuts down right after turning on.

                                  Originally posted by Malachi View Post
                                  With my meter on diode mode I get a beep on D607.
                                  But testing it the third time it doesn't beep anymore. Same with others.
                                  You are not testing them with TV is still plugged into the outlet, 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


                                    #18
                                    Re: Emerson LF501EM5F shuts down right after turning on.

                                    A diode can give you false readings when they are in circuit. Check the diode with both probes in diode mode on both sides. If it beeps both ways ( also out of circuit ) then its bad. If you get OL + reading then it's ok.
                                    I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                                    Comment


                                      #19
                                      Re: Emerson LF501EM5F shuts down right after turning on.

                                      TV unplugged. Sometimes they beep, sometimes they don't. Are all of those diodes with the number start with Dxxx?

                                      Comment


                                        #20
                                        Re: Emerson LF501EM5F shuts down right after turning on.

                                        Yes on boards they start with "D" for diode. C for capacitor and R for resistor.

                                        A diode measuring OL/Beep only ( out of circuit ) is bad.

                                        You need to put black and red prope on both legs and other way around. You should get a reading on 1 side and OL on the other side. It can take a reading on both sides but 1 side will go to OL eventually.
                                        Last edited by Moreno83; 03-07-2016, 03:45 PM.
                                        I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                                        Comment

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