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    #21
    Re: Sony SMD-HS73

    Originally posted by torin3 View Post
    Edit: Crud, I'm out of 470uf 25V caps. I have 680uf 25V caps. Too much of step up in capacitance?
    For test only purposes, I would substitute the 680uF in. This reasoning could be totally WRONG, but

    470uF * 1.20 (+/-20%) = 564uF

    680uF * 0.8 (+/-20%) = 544uF
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      #22
      Re: Sony SMD-HS73

      Originally posted by PlainBill View Post
      That would be normal. Usually the 5V output is regulated, the 12V output floats depending on the load on the 5V supply. I'd expect the 12V output to be very close to 12V if the inverter was on, higher otherwise.

      PlainBill
      That makes sense. Arrgh, missed this reply earlier. Darn, 9 inch netbook.
      Last edited by retiredcaps; 12-05-2010, 05:06 PM.
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        #23
        Re: Sony SMD-HS73

        Don't forget
        it is entirely possible to have more than one bad ccfl, to rule that out you could hook up all the ccfls from your good monitor, The ribbon cable does not need to be hooked up just make sure it's well insulated, A video source is required
        Al.
        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

        Comment

          #24
          Re: Sony SMD-HS73

          Originally posted by jetadm123 View Post
          What points on T1 and T2 did you check when you first took these readings?
          The points Retiredcaps circled. I realize they weren't exactly the same, but they were less than 30 ohms apart at about 1000 ohms.

          Edit: I'm also currently letting it warm up to see if I can adjust the brightness control.. Currently it isn't staying on long enough to access the menu.
          Last edited by torin3; 12-05-2010, 04:54 PM.

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            #25
            Re: Sony SMD-HS73

            Originally posted by retiredcaps View Post
            For test only purposes, I would substitute the 680uF in. This reasoning could be totally WRONG, but

            470uF * 1.20 (+/-20%) = 564uF

            680uF * 0.8 (+/-20%) = 544uF
            Well, with the 680uf cap in, it doesn't light up at all. Power light is green, but the screen stays black. Putting the 470uf cap back in now.

            Comment

              #26
              Re: Sony SMD-HS73

              Originally posted by torin3 View Post
              Well, with the 680uf cap in, it doesn't light up at all. Power light is green, but the screen stays black. Putting the 470uf cap back in now.
              Of course, I didn't do the math the other way.

              There is a possibility that the 470uF cap is still bad. Right now, I'm out of ideas and have to head out soon.
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                #27
                Re: Sony SMD-HS73

                Originally posted by retiredcaps View Post
                Of course, I didn't do the math the other way.

                There is a possibility that the 470uF cap is still bad. Right now, I'm out of ideas and have to head out soon.
                Wel, with the 470uF cap back in, it is working the way it was before.

                I'm going to try 2 lamps at a time from another monitor, but I don't think I can get all 4 to reach.

                I'll be putting together an order for all the other caps that haven't been replaced and see if that helps.

                Have a good evening.

                Comment

                  #28
                  Re: Sony SMD-HS73

                  Ok, I tried with 2 known good CCFL lamps at a time, and got the same behavior.

                  I can't try 4 at a time just yet because the only monitor I have available for this has all 4 plugs close together and this monitor has them on opposite sides of the inverter board.

                  I'll order the rest of the caps to make sure they are all replaced. Should get them in by Wednesday or Thursday.

                  I'll be happy to try any other tests.

                  Comment

                    #29
                    Re: Sony SMD-HS73

                    Ok, I tried 4 known good CCFLs all at the same time.

                    Same flashing behavior.

                    Caps should arrive tomorrow.

                    Comment

                      #30
                      Re: Sony SMD-HS73

                      Originally posted by torin3 View Post
                      Caps should arrive tomorrow.
                      Well, I guess not.

                      Looks like Christmas mail slowdown has hit already...

                      Comment

                        #31
                        Re: Sony SMD-HS73

                        Caps arrived today. Replaced all the cans, including the surface mounted electrolytics.

                        No change in behavior.

                        Comment

                          #32
                          Re: Sony SMD-HS73

                          Can we get a clear focused close up photo (as close to 2000x2000 and without flash) of the area in red?

                          edit: What is the part number of that 20 pin IC in the red area?
                          Attached Files
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                            #33
                            Re: Sony SMD-HS73

                            Sorry, had to use flash, as I don't have bright house lights.

                            I think I got a clear enough photo. If not, I can try again.
                            Attached Files

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                              #34
                              Re: Sony SMD-HS73

                              Have you done any thing, as far as re soldering the inverter transformers?
                              Al.
                              Never mind missed it in an earlier post
                              Last edited by alexanna; 12-11-2010, 12:15 AM. Reason: correction
                              Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

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                                #35
                                Re: Sony SMD-HS73

                                Ok I have something for you to try.
                                Substitute one ccfl at a time again, but find a place on the back of the lcd where you can see the light of the ccfl.As you try the ccfl in each socket dose the brightness look the same on the test ccfl in each socket.
                                I am hoping this might find a area of the inverter to look at closer.
                                Al.
                                Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                Comment

                                  #36
                                  Re: Sony SMD-HS73

                                  Can you give us the part numbers for U1, U2 and U3?

                                  Comment

                                    #37
                                    Re: Sony SMD-HS73

                                    hi to all ze members.im new here at badcaps.umm we usually encounter that kind of problem.same brand,same model.very hard to find ze culprit. what we do is we replace the inverter with a home made one..it works..but maybe a ten percent degradation in contrast..i

                                    Comment

                                      #38
                                      Re: Sony SMD-HS73

                                      Originally posted by alexanna View Post
                                      Ok I have something for you to try.
                                      Substitute one ccfl at a time again, but find a place on the back of the lcd where you can see the light of the ccfl.As you try the ccfl in each socket dose the brightness look the same on the test ccfl in each socket.
                                      I am hoping this might find a area of the inverter to look at closer.
                                      Al.
                                      When I had all 4 known good CCFLs plugged in, they were all 'bare' and I didn't see any obvious light difference. I will try again.

                                      Originally posted by jetadm123 View Post
                                      Can you give us the part numbers for U1, U2 and U3?
                                      / = new line
                                      U1 = 0Z960S / 0326B1 / V31228.2
                                      U2 = 4542 / (logo)AD(Delta smbol) / W37A
                                      U3 = same as U2

                                      Comment

                                        #39
                                        Re: Sony SMD-HS73

                                        This is a low probability, but just for my own curiousity, can you carefully measure the voltage across the main filter capacitor (the big one) and see if you get steady DC voltage?

                                        You are looking for a steady voltage while the screen is flickering. You can use the original ccfls for this test.

                                        For this test, I like to use aligator clips with my multimeter so I can do this measurement without using my hands. It is high voltage that you will be measuring (about 165V DC).
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                                          #40
                                          Re: Sony SMD-HS73

                                          Did you ever verify that you can see an image if you shine a flashlight on the screen? The logic board is getting 5V and the voltage regs are working, therefore, you should at least get an image.

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