Sharp LC-40LE810UN question

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  • tibimakai
    Badcaps Legend
    • Jan 2012
    • 3680
    • USA

    #221
    Re: Sharp LC-40LE810UN question

    I was alone with my 4 year old daughter and didn't have time, but later today I will measure and take pictures.

    Comment

    • tibimakai
      Badcaps Legend
      • Jan 2012
      • 3680
      • USA

      #222
      Re: Sharp LC-40LE810UN question

      OK, T-con is not receiving anything.
      Point
      #1= 5.555V
      #2= 13.04V
      #3= 13.04V
      #4= after like 10 sec. becomes 12.17V for a second and then drops toward 0V.
      #5= 0V(alternates between + and -)
      Here are the pictures:
      Attached Files
      Last edited by tibimakai; 10-13-2012, 11:56 PM.

      Comment

      • olegi
        Senior Member
        • Jun 2012
        • 63
        • Canada

        #223
        Re: Sharp LC-40LE810UN question

        Hi tibimakai,can you remove all cable from power supply lave only 110v ,apply PS_ON manually and see V on main caps.Post results.
        Attached Files
        Last edited by olegi; 10-15-2012, 09:14 PM.

        Comment

        • tibimakai
          Badcaps Legend
          • Jan 2012
          • 3680
          • USA

          #224
          Re: Sharp LC-40LE810UN question

          Nothing happens.

          Comment

          • tibimakai
            Badcaps Legend
            • Jan 2012
            • 3680
            • USA

            #225
            Re: Sharp LC-40LE810UN question

            I don't think this power supply is as simple as other TVs. This is probably has a smart power supply also, since the TV is a smart TV(kidding).
            I see an AC detect there, I guess that one has to receive some signal too, no?

            Comment

            • olegi
              Senior Member
              • Jun 2012
              • 63
              • Canada

              #226
              Re: Sharp LC-40LE810UN question

              Signal (PD-9)AC-det is output signal from Q7061 to detect it they use 3rd optocoupler PC7703

              Comment

              • tibimakai
                Badcaps Legend
                • Jan 2012
                • 3680
                • USA

                #227
                Re: Sharp LC-40LE810UN question

                So, what should be the next step?

                Comment

                • tibimakai
                  Badcaps Legend
                  • Jan 2012
                  • 3680
                  • USA

                  #228
                  Re: Sharp LC-40LE810UN question

                  OK, to bring back the attention I'm posting the measurements that I have at the PS connector.
                  So it takes a couple of seconds to turn on, as Olegi said like 10 sec.
                  When the TV is turned on, I have the right voltages(not sure about the PWR_POW at pin#12).
                  #1-2= 13.02V
                  #3-4= 13.02V
                  #5-6= 0V(GND)
                  #7-8= 0V(GND)
                  #9= 3.13V(AC_DET)
                  #10= 3.03V(PS_ON)
                  #11= 5.02V(STBY)
                  #12= 0.12V(PWR_POW)
                  When the blinking code comes up, the only voltage is left is the standby.
                  I know that the 400V is missing and that is most likely the problem of this TV.
                  I guess we have to look at the DAC002, am I right?
                  When the TV comes on the 168V drops to 155V and then back up to 168V when tghe code kicks in.
                  Last edited by tibimakai; 10-24-2012, 07:59 PM.

                  Comment

                  • olegi
                    Senior Member
                    • Jun 2012
                    • 63
                    • Canada

                    #229
                    Re: Sharp LC-40LE810UN question

                    You said that you have bought 2nd power supply .Do you have same reading on this connector ?When you have on pin #10= 3.03V(PS_ON) there has to be ~400V on main caps.Can you tell what is the voltage on C7961A ;C7962A for first 10 sec til you get error code?
                    Last edited by olegi; 10-27-2012, 04:13 PM.

                    Comment

                    • tibimakai
                      Badcaps Legend
                      • Jan 2012
                      • 3680
                      • USA

                      #230
                      Re: Sharp LC-40LE810UN question

                      It was exactly the same as mine, so no reason to keep it. I will let you know about the voltages, now I'm at the beach.

                      Comment

                      • olegi
                        Senior Member
                        • Jun 2012
                        • 63
                        • Canada

                        #231
                        Re: Sharp LC-40LE810UN question

                        here is similar schematic
                        Attached Files

                        Comment

                        • tibimakai
                          Badcaps Legend
                          • Jan 2012
                          • 3680
                          • USA

                          #232
                          Re: Sharp LC-40LE810UN question

                          The voltages are 13.04V and 6.38V.
                          Thanks for the schematics, I will have to look at them.

                          Comment

                          • Mt.Man
                            Senior Member
                            • Jun 2012
                            • 53
                            • USA

                            #233
                            Re: Sharp LC-40LE810UN question

                            Had a LC-40LE835U last week that uses the same power board. It also had a 2 long, 5 short error with no back lights coming on.
                            Turns out the panel was cracked. The TCON senses an voltage error on the panel and produces the 2 long, 5 short panel power error.

                            Try forcing on the TV, which should power up the back lights. On the TV touch pad, Press and hold Vol DN and Ch Up, while holding those press PWR. Do not release PWR till the icon LED lights steady then release the PWR button only but still hold the other 2. The back lights should come on.

                            Comment

                            • tibimakai
                              Badcaps Legend
                              • Jan 2012
                              • 3680
                              • USA

                              #234
                              Re: Sharp LC-40LE810UN question

                              Thank you, I will try it when I will be home, but I hope I don't have the same issue though.

                              Comment

                              • tibimakai
                                Badcaps Legend
                                • Jan 2012
                                • 3680
                                • USA

                                #235
                                Re: Sharp LC-40LE810UN question

                                Unfortunately it's not working this method, because as I plug it in it's already booting up by itself.

                                Comment

                                • tibimakai
                                  Badcaps Legend
                                  • Jan 2012
                                  • 3680
                                  • USA

                                  #236
                                  Re: Sharp LC-40LE810UN question

                                  DDA002C is not getting Vcc. I don't know how much it should be this voltage.

                                  Comment

                                  • tibimakai
                                    Badcaps Legend
                                    • Jan 2012
                                    • 3680
                                    • USA

                                    #237
                                    Re: Sharp LC-40LE810UN question

                                    The PS_ON is 3.03V that is normal? You guys are saying that it should be brought up to 5V?
                                    Last time when Olegi told me to try starting manually, I have applied 3.3V to PS_ON. I should try with 5V?

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #238
                                      Re: Sharp LC-40LE810UN question

                                      That is more than enough to turn on the transistor to turn on an Optoisolator.
                                      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

                                      • tibimakai
                                        Badcaps Legend
                                        • Jan 2012
                                        • 3680
                                        • USA

                                        #239
                                        Re: Sharp LC-40LE810UN question

                                        What do you think that it should be the next step?
                                        The NCP1608 IC(8 pin) "makes" the 400V?
                                        To me it seems that the 400V is not turning on. Everything turns on, then when the code kicks in they are all gone.
                                        Unfortunately I have three TVs that are a pain in the axx to fix. Very soon I will have to take a look again at that shorted LG PS. Without the FETs there is no short(!!).
                                        I still have those two 22" LG and Samsung and that 24" Asus with the burned resistors.
                                        Not looking forward to these repairs.
                                        I will probably bug you guys with these devices. Sorry about that in advance.

                                        Comment

                                        • tibimakai
                                          Badcaps Legend
                                          • Jan 2012
                                          • 3680
                                          • USA

                                          #240
                                          Re: Sharp LC-40LE810UN question

                                          Can somebody please answer to my question?
                                          Holiday shopping is here and I need some money.

                                          Comment

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