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    #1

    Olevia 242-T11 No Picture no Sound No back lights

    I recently acquired this TV, and have been trying to fix it. I have read previous posts where other members had similar problems with this model TV. The problems I am having with this TV are no sound, no picture, no back lights, only the blue light that come on in the front of the TV. When I press the power button, the blue light turns off and but nothing happens, here is where I found my first problem, I can not seem to turn the TV off by pressing the power button again. I know it is still on because I can see LED light on the main board, but that is all I see. I have checked the voltages coming out of the power supply and they are all normal, except for the voltages at the B On( blue wire) and ON/OF(Brown Wire) and the BRI (Yellow Wire). in fact, I am not getting any reading at all, when I try turning the TV on or OFF.

    Any help would be greatly appreciated.

    I have checked all the capacitors and they seem to be OK.
    Tags: None
    #2
    Re: Olevia 242-T11 No Picture no Sound No back lights

    Pics of the power supply and the main board?

    Comment

      #3
      Re: Olevia 242-T11 No Picture no Sound No back lights

      Sorry, I am New, but here are some pictures of the main board and the power supply.
      Thanks
      Attached Files

      Comment

        #4
        Re: Olevia 242-T11 No Picture no Sound No back lights

        So the psu is fully powered up for you to measure all the voltages? but nothing turns on?

        Comment

          #5
          Re: Olevia 242-T11 No Picture no Sound No back lights

          All the voltages, except the voltage at the brown, yellow and blue wires, which correspond to the B On, On/OFF and the BRI outputs of the power supply

          Comment

            #6
            Re: Olevia 242-T11 No Picture no Sound No back lights

            can I see a full pic of the back of the tv and all the boards?

            Comment

              #7
              Re: Olevia 242-T11 No Picture no Sound No back lights

              Sure here they are.

              The question I want to ask is what is feeding the voltage for to the blue, yellow and brown wires? I read in another thread that the voltage out of the blue wore should be about 5 volts, and that the voltage at the yellow wire should be about 3.3 volts. Is this correct? And what about the voltage at the brown wire. I also want to mention that once the TV is turned on, it cannot be turned OFF unless it gets unplugged.

              Thanks
              Attached Files

              Comment

                #8
                Re: Olevia 242-T11 No Picture no Sound No back lights

                to me it sounds like a main board problem, But wait for one of the more experience guys check out the thread. while you wait, Did you check all connections?

                Comment

                  #9
                  Re: Olevia 242-T11 No Picture no Sound No back lights

                  Yes, I checked all connections.
                  One more thing, using a jumper wire, I was able to feed five volts to the blue wire and guess what, the back lights turned on. However there is sort of a busing noise coming from one of the inverter boards, the Slave to be more specific. I don't know if it is because the voltage is to high, or the current, or simple is the wrong voltage that should be coming from this out put. In any case, I think that this discards the Inverter boards being the problem.

                  Thanks for your help

                  Comment

                    #10
                    Re: Olevia 242-T11 No Picture no Sound No back lights

                    Check the voltage regulators on the main board. My sig file explains how to test and report your findings.
                    --- 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

                      #11
                      Re: Olevia 242-T11 No Picture no Sound No back lights

                      Thank you all. I will take better pictures of the boards and post them later today. About the regulators, I have tested them and they all seem to be OK. but I will test them again. Do you think that this might be the reason why I don't get voltage in the B On, and BRI Pins of the CNS1 of the power supply.

                      Thanks

                      Comment

                        #12
                        Re: Olevia 242-T11 No Picture no Sound No back lights

                        Please post the reading of each regulators.
                        This is the way to figure out if the adjustable regulator is good or not:
                        Notes: we are looking at the regulator with the Big tab up (the big tab is tied internally to the center pin).
                        Adjustable regulator will have two resistors attached to it, one resistor (Rfb) is between pin1 and pin2, another resistor (Rg) is between pin1 and ground. Pin3 is an input pin.
                        The voltage between the Adjust pin (left pin) and the center pin (Pin2, output) will always be 1.25V +/- 2% (this is the precision voltage reference), if it is not, it is bad.
                        To figure out what the output voltage should be: measure the voltage between pin 1 and ground and add 1.25V to that number, that is the output voltage on pin 2 but you have to make sure you do have 1.25 between pin 1 and 2 as noted above
                        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: Olevia 242-T11 No Picture no Sound No back lights

                          Hello everyone. I was out, but I am back. I want to thank everyone for all your help.
                          Here are the readings I took from each of the voltage regulators:

                          U18 Model# 1084
                          Pin 1 = 2.0509
                          Pin 2 = 3.2976
                          Pin 3 = 4.9340

                          U48 Model# 1084 ( Adjustable, I think)
                          Pin1 = 0.0275
                          Pin2 = 1.2804
                          Pin3 = 3.3220

                          U10 Model# 1084 (Adjustable, I think)
                          Pin1 = 0.2509
                          Pin2 = 1.5032
                          Pin3 = 3.3215

                          U9 Model#1084
                          Pin1 = 2.0387
                          Pin2 = 3.2844
                          Pin3 = 4.9080

                          I also saw this one that has 5 Pins, so I went a head and took the readings as well.

                          U2 Model# 1506
                          Pin1 = 17.909
                          Pin2 = 12.034
                          Pin3 = -0.0002
                          Pin4 = 1.2226
                          Pin5 = 0.00001

                          Let me know if you need anything else.

                          I think that 2 of those are adjustable because I see resistors connected to Pin1 and Pin 2. I think.

                          I am eager to learn more.

                          Thanks.

                          Comment

                            #14
                            Re: Olevia 242-T11 No Picture no Sound No back lights

                            Not sure what U2 is, but the rest seems to be within 2% (add 1.25 to the reading on pin1 = output voltage)
                            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: Olevia 242-T11 No Picture no Sound No back lights

                              Originally posted by budm View Post
                              Not sure what U2 is,
                              --- 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

                                #16
                                Re: Olevia 242-T11 No Picture no Sound No back lights

                                Where are the readings for U5?
                                --- 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

                                  #17
                                  Re: Olevia 242-T11 No Picture no Sound No back lights

                                  What do you suggest I do next. I think that the problem is that I am not getting any voltage in the blue wire corresponding to the B 0n out of the power supply. Should I replace the capacitors in the power supply. They don't look damaged, but I have also read that sometimes they don't show damaged but they are shorted internally.
                                  can you tell me which component should be supplying the power to the following Pins, and what the normal output should be.

                                  Blue Wire B On
                                  Yellow Wire BRI
                                  Brown wire ON/OFF

                                  I think that the first thing that i need to fix is the fact that once the TV is on it cannot be turned OFF, unless it gets unplugged.

                                  Thanks in advance.
                                  Let me know if you need more pictures.

                                  Comment

                                    #18
                                    Re: Olevia 242-T11 No Picture no Sound No back lights

                                    Sorry, here are the readings for U5:

                                    U5 Model# 1084
                                    Pin1 = 2.0637
                                    Pin2 = 3.3163
                                    Pin3 = 5.086

                                    Comment

                                      #19
                                      Re: Olevia 242-T11 No Picture no Sound No back lights

                                      Should I at this point discard the Power supply and the T Con as being the source of the problem, or is there any more troubleshooting that I can do that would help me narrow down the problem.

                                      thanks

                                      Comment

                                        #20
                                        Re: Olevia 242-T11 No Picture no Sound No back lights

                                        Can some one tell me what are the voltage readings that I should be getting at each of the power supply outputs

                                        Thanks

                                        Comment

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