42inch Touch Screen wont power on

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  • Scenic
    o.O
    • Sep 2007
    • 2640
    • Germany

    #61
    Re: 42inch Touch Screen wont power on

    Originally posted by tom66
    Yes, the white stuff is the thermal paste. If the paste isn't smudged, then you might not need some more paste, but I'd recommend it anyway. Here is something that will work: http://www.ebay.co.uk/itm/CPU-Therma...item3f10fcf53e

    Get two or three, as one of those tubes doesn't last long.
    2x 1g http://cgi.ebay.co.uk/120816306484
    5x 1g http://cgi.ebay.co.uk/110558339447

    ^ both from the UK instead of china. saves time.

    edit: uhm.. i don't know where epicfatigue is from, so ignore this if it isn't UK.
    Last edited by Scenic; 12-08-2011, 04:41 PM.

    Comment

    • epicfatigue
      Senior Member
      • Dec 2011
      • 68

      #62
      Re: 42inch Touch Screen wont power on

      Originally posted by Scenic
      2x 1g http://cgi.ebay.co.uk/120816306484
      5x 1g http://cgi.ebay.co.uk/110558339447

      ^ both from the UK instead of china. saves time.

      edit: uhm.. i don't know where epicfatigue is from, so ignore this if it isn't UK.
      Hey guys sorry i should say alittle about myself

      I am From Australia, hence my funny hours.
      I am a AMI Security Administrator for the Smart Meter Grid (so dont hate me lol)

      Comment

      • retiredcaps
        Badcaps Legend
        • Apr 2010
        • 9271

        #63
        Re: 42inch Touch Screen wont power on

        Originally posted by epicfatigue
        open .0L closed 0 volts ? is that right shouldnt it read the voltage of the battery?

        and yes lol it is .0L i am reading sorry guys
        0V is 0.0 (zero point zero).

        0L is "out of range", "infinity".

        The two are polar opposites.
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        Comment

        • epicfatigue
          Senior Member
          • Dec 2011
          • 68

          #64
          Re: 42inch Touch Screen wont power on

          checked all the diodes, they all worked they tested .194v however one tested .094 across both pins, could this be the problem?

          Where should i check now?

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #65
            Re: 42inch Touch Screen wont power on

            Originally posted by epicfatigue
            checked all the diodes, they all worked they tested .194v however one tested .094 across both pins, could this be the problem?

            Where should i check now?
            Remove the one that tested .094 across both pins and re-test it; if it still tests .094 across both pins you've found a faulty diode . A faulty diode will prevent the power supply's primary side from starting properly.
            Last edited by tom66; 12-10-2011, 04:31 AM.
            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

            • epicfatigue
              Senior Member
              • Dec 2011
              • 68

              #66
              Re: 42inch Touch Screen wont power on

              Originally posted by tom66
              Remove the one that tested .094 across both pins and re-test it; if it still tests .094 across both pins you've found a faulty diode . A faulty diode will prevent the power supply's primary side from starting properly.
              awesome gunna go get one in a hour or so, now these generally die from overvoltage ? could i have a possible bad resistor or could it be that when they all died a power surge caused this to overvolt?

              Just wondering if i should check otherthings incase it blows another?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #67
                Re: 42inch Touch Screen wont power on

                Originally posted by epicfatigue
                awesome gunna go get one in a hour or so, now these generally die from overvoltage ? could i have a possible bad resistor or could it be that when they all died a power surge caused this to overvolt?

                Just wondering if i should check otherthings incase it blows another?
                These diodes die from temperature and sustained load. If the TV is, for example, mounted on a wall and used 24/7, the diode will succumb to the high temperatures (was it used in a business environment, for example as an advertisement display?) I wouldn't think any other component could cause the problem, but get two or three just in case. If it blows again, we'll need to look at the power supply more closely.
                Last edited by tom66; 12-10-2011, 04:22 PM.
                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

                • epicfatigue
                  Senior Member
                  • Dec 2011
                  • 68

                  #68
                  Re: 42inch Touch Screen wont power on

                  Originally posted by tom66
                  These diodes die from temperature and sustained load. If the TV is, for example, mounted on a wall and used 24/7, the diode will succumb to the high temperatures (was it used in a business environment, for example as an advertisement display?) I wouldn't think any other component could cause the problem, but get two or three just in case. If it blows again, we'll need to look at the power supply more closely.
                  Well i turned it on hoped for the best and same clicking noise from relay no power where now?

                  Comment

                  • epicfatigue
                    Senior Member
                    • Dec 2011
                    • 68

                    #69
                    Re: 42inch Touch Screen wont power on

                    i replaced the under preforming diode and still the same problem presists

                    However i checked the part i was sold and they are different,

                    Original was 60v 30amps
                    Replacement is 100V 20Amps

                    Guessing the problem could still be the diode ?
                    Last edited by epicfatigue; 12-11-2011, 01:49 AM.

                    Comment

                    • retiredcaps
                      Badcaps Legend
                      • Apr 2010
                      • 9271

                      #70
                      Re: 42inch Touch Screen wont power on

                      Originally posted by epicfatigue
                      i replaced the under preforming diode and still the same problem presists
                      1) Did you test the diode BEFORE putting on the board?

                      2) Does it test shorted on the board?

                      3) Remeasure all the diodes on the board to see if any are shorted since the installation?
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                      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.

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                      Comment

                      • epicfatigue
                        Senior Member
                        • Dec 2011
                        • 68

                        #71
                        Re: 42inch Touch Screen wont power on

                        Originally posted by retiredcaps
                        1) Did you test the diode BEFORE putting on the board?

                        2) Does it test shorted on the board?

                        3) Remeasure all the diodes on the board to see if any are shorted since the installation?
                        Yes i did before i put it in, it measured a higher voltage .264 compared to the others....

                        in highns sight i shouldnt have whacked it in but the guy told me there was no diffirence and since he had a double degree i believed him.

                        I will test all the diodes and see which one failed if one did.

                        If they all test fine should i try and find the same voltage / ampage diode ? and where should we go next if they all test fine?

                        So i can do more then 1 step.

                        Thanks again for your presistance

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #72
                          Re: 42inch Touch Screen wont power on

                          Originally posted by epicfatigue
                          Yes i did before i put it in, it measured a higher voltage .264 compared to the others....

                          in highns sight i shouldnt have whacked it in but the guy told me there was no diffirence and since he had a double degree i believed him.

                          I will test all the diodes and see which one failed if one did.

                          If they all test fine should i try and find the same voltage / ampage diode ? and where should we go next if they all test fine?

                          So i can do more then 1 step.

                          Thanks again for your presistance
                          The diode you used as a replacement should be okay, I doubt any rail is drawing more than 20A on that power supply.

                          .264 both ways, or just one way? This is important. If it measures both ways, then the diode has failed.
                          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

                          • epicfatigue
                            Senior Member
                            • Dec 2011
                            • 68

                            #73
                            Re: 42inch Touch Screen wont power on

                            Originally posted by tom66
                            The diode you used as a replacement should be okay, I doubt any rail is drawing more than 20A on that power supply.

                            .264 both ways, or just one way? This is important. If it measures both ways, then the diode has failed.
                            they both measure 0.255 from either side but the block how they should i got 2 of them they operate like that.

                            the originals put out .192 execpt for one that was .099

                            is it possible they are all faulty?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #74
                              Re: 42inch Touch Screen wont power on

                              Originally posted by epicfatigue
                              they both measure 0.255 from either side but the block how they should i got 2 of them they operate like that.

                              the originals put out .192 execpt for one that was .099

                              is it possible they are all faulty?
                              All faulty would be very rare. Let's be sure you are testing them the right way. What mode do you have your multimeter on? Post a picture of it in that range.
                              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

                              • epicfatigue
                                Senior Member
                                • Dec 2011
                                • 68

                                #75
                                Re: 42inch Touch Screen wont power on

                                Originally posted by tom66
                                All faulty would be very rare. Let's be sure you are testing them the right way. What mode do you have your multimeter on? Post a picture of it in that range.
                                They all tested fine whats next?

                                red to pin 1 black to pin 2 .2XX
                                black to pin 1 red to pin to nothing

                                as diode only lets its pass one way its okay i am checking them right,

                                whats cahnces of it being the transformer?

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #76
                                  Re: 42inch Touch Screen wont power on

                                  Originally posted by epicfatigue
                                  They all tested fine whats next?

                                  red to pin 1 black to pin 2 .2XX
                                  black to pin 1 red to pin to nothing

                                  as diode only lets its pass one way its okay i am checking them right,

                                  whats cahnces of it being the transformer?
                                  Transformer would be rare. Did you test the failed diode you removed?
                                  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

                                  • epicfatigue
                                    Senior Member
                                    • Dec 2011
                                    • 68

                                    #77
                                    Re: 42inch Touch Screen wont power on

                                    Originally posted by tom66
                                    Transformer would be rare. Did you test the failed diode you removed?
                                    Yes as stated above it till functioned as the others but in diode test it pased a much lower voltage it pasted .099 where the others passed as stated above in post #73

                                    the method of testing is done as follows

                                    1-2 Voltage (Red Pin 1 Black Pin 2)
                                    2-1 OL (Black Pin 1 Red Pin 2)
                                    2-3 OL (Red Pin 2 Black Pin 3)
                                    3-2 Voltage (Black Pin 2 Red Pin 3)
                                    3-1 OL
                                    1-3 OL
                                    Last edited by epicfatigue; 12-11-2011, 05:00 PM.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #78
                                      Re: 42inch Touch Screen wont power on

                                      Originally posted by epicfatigue
                                      Yes as stated above it till functioned as the others but in diode test it pased a much lower voltage it pasted .099 where the others passed as stated above in post #73

                                      the method of testing is done as follows

                                      1-2 Voltage (Red Pin 1 Black Pin 2)
                                      2-1 OL (Black Pin 1 Red Pin 2)
                                      2-3 OL (Red Pin 2 Black Pin 3)
                                      3-2 Voltage (Black Pin 2 Red Pin 3)
                                      3-1 OL
                                      1-3 OL
                                      That is the correct way to test it. That's a very strange diode though - .099 would be extremely efficient. What is the part # on it?
                                      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

                                      • epicfatigue
                                        Senior Member
                                        • Dec 2011
                                        • 68

                                        #79
                                        Re: 42inch Touch Screen wont power on

                                        Originally posted by tom66
                                        That is the correct way to test it. That's a very strange diode though - .099 would be extremely efficient. What is the part # on it?
                                        New Part 838 MBR20100CT .225 (i got 2 of these both tested the same)
                                        ORIGINAL B156N F30FC6 (the .099 one) Most were ranged between .198 - .178

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #80
                                          Re: 42inch Touch Screen wont power on

                                          Okay, let's take a different angle of attack. Replace the diode with the new one. Post a picture of the connector going from the PSU to the main board.
                                          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

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