Announcement

Collapse
No announcement yet.

Sony SMD-HS73

Collapse
X
Collapse
 
  • Page of 6
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 3 4 5 6 template Next
    #81
    Re: Sony SMD-HS73

    I could be wrong, but Q7 may not be a transistor, but some sort of voltage detector. Referring to spec sheet, pin1=5V and pin3=4.2V. Try measuring for these voltages.
    Attached Files

    Comment

      #82
      Re: Sony SMD-HS73

      Originally posted by jetadm123 View Post
      I could be wrong, but Q7 may not be a transistor, but some sort of voltage detector. Referring to spec sheet, pin1=5V and pin3=4.2V. Try measuring for these voltages.
      Pin 1 to 2 = 4.39 VDC
      Pin 3 to 2 = 1.17VDC with lamp off, up to 5.7VDC with lamp on.

      Comment

        #83
        Re: Sony SMD-HS73

        This inverter controller has been discused look at the last 2 posts.
        No fix was listed but an explantion of how the oz960 works.
        https://www.badcaps.net/forum/showth...ighlight=oz960
        Al.
        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

        Comment

          #84
          Re: Sony SMD-HS73

          Originally posted by torin3 View Post
          Pin 1 to 2 = 4.39 VDC
          Pin 3 to 2 = 1.17VDC with lamp off, up to 5.7VDC with lamp on.
          Try measuring the same points using a different ground. If you get a voltage on pin 2, I either guessed wrong on what Q7 is or it may be defective.

          Comment

            #85
            Re: Sony SMD-HS73

            Originally posted by jetadm123 View Post
            Try measuring the same points using a different ground. If you get a voltage on pin 2, I either guessed wrong on what Q7 is or it may be defective.
            Same readings using a ground point near CN1.

            Ground to pin 2 is 0.00VDC.

            Comment

              #86
              Re: Sony SMD-HS73

              Originally posted by torin3 View Post
              Off = .12V
              On = .14V
              Light on, hard to tell with my slow meter, but it looks like close to 5V.

              I think you are going to find a problem with the logic board. Could you re check the voltages on the on off pin at CN1?
              If you look at page 2 of the data sheet of the oz960 the enable or the on off voltage is 2 to 3.3volts when on.[you have to lay your head on your left shoulder to read it].
              I think I would also take a closer look at the voltage regulators on the logic board, monitor the output voltages as you power the monitor on and do it several times.
              I really don't know if this is the answer it's just something to try.
              Al
              Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

              Comment

                #87
                Re: Sony SMD-HS73

                Originally posted by alexanna View Post
                I think you are going to find a problem with the logic board. Could you re check the voltages on the on off pin at CN1?
                If you look at page 2 of the data sheet of the oz960 the enable or the on off voltage is 2 to 3.3volts when on.[you have to lay your head on your left shoulder to read it].
                I think I would also take a closer look at the voltage regulators on the logic board, monitor the output voltages as you power the monitor on and do it several times.
                I really don't know if this is the answer it's just something to try.
                Al
                Voltages at the on/off pin are the same as before at CN1.

                Checking the Enable voltage from the oz960, I'm getting 1.17V for off, then frequent drops to about .5V.

                Should I be looking between pin 3 for U1 and the on/off location at CN1 for possible bad components? Or should I consider getting a replacement oz960?

                Also, the two voltage regulators on the logic board. 3.3V seems to be pretty close to that. When on, a steady 3.34V when off steady 3.37V. The 1.8V chips bounces between 1.09V and 1.24V when left on. When turned off, it goes immediately to 2.35V and gradually works it way up to 2.48V and stays steady there. When turned on it goes to 1.17V for a second or two before bouncing between the 1.09V and the 1.24V.

                Comment

                  #88
                  Re: Sony SMD-HS73

                  Originally posted by torin3 View Post
                  Voltages at the on/off pin are the same as before at CN1.

                  Checking the Enable voltage from the oz960, I'm getting 1.17V for off, then frequent drops to about .5V.

                  Should I be looking between pin 3 for U1 and the on/off location at CN1 for possible bad components? Or should I consider getting a replacement oz960?

                  Also, the two voltage regulators on the logic board. 3.3V seems to be pretty close to that. When on, a steady 3.34V when off steady 3.37V. The 1.8V chips bounces between 1.09V and 1.24V when left on. When turned off, it goes immediately to 2.35V and gradually works it way up to 2.48V and stays steady there. When turned on it goes to 1.17V for a second or two before bouncing between the 1.09V and the 1.24V.
                  The 1.8 volt regulator may be a problem,
                  I am going to ask for help on it, let's see what the other guys say
                  Al
                  Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                  Comment

                    #89
                    Re: Sony SMD-HS73

                    Originally posted by torin3 View Post
                    Also, the two voltage regulators on the logic board.The 1.8V chips bounces between 1.09V and 1.24V when left on. When turned off, it goes immediately to 2.35V and gradually works it way up to 2.48V and stays steady there. When turned on it goes to 1.17V for a second or two before bouncing between the 1.09V and the 1.24V.
                    I'm a bit confused and it is almost 1am in the morning, but back in post #9, the regulators were identified as 1086D25 a 2.5V regulator and BA033 a 3.3V regulator. Where did 1.8 come from?
                    --- 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

                      #90
                      Re: Sony SMD-HS73

                      Originally posted by retiredcaps View Post
                      I'm a bit confused and it is almost 1am in the morning, but back in post #9, the regulators were identified as 1086D25 a 2.5V regulator and BA033 a 3.3V regulator. Where did 1.8 come from?
                      I was up late and tired too and reading the wrong leg on the regulator?

                      Comment

                        #91
                        Re: Sony SMD-HS73

                        Originally posted by retiredcaps View Post
                        I'm a bit confused and it is almost 1am in the morning, but back in post #9, the regulators were identified as 1086D25 a 2.5V regulator and BA033 a 3.3V regulator. Where did 1.8 come from?
                        Ok, I had a chance to remeasure this morning. I was reading the wrong leg. Between ground and Vout I'm get about (If I'm remembering right, I'll check again when I get home) about 2.63V. It is rock steady when on or off or the lamp coming on or off.

                        Checking the datasheet, if my memory is correct, the voltage looks a little high.

                        Comment

                          #92
                          Re: Sony SMD-HS73

                          Originally posted by torin3 View Post
                          Ok, I had a chance to remeasure this morning. I was reading the wrong leg. Between ground and Vout I'm get about (If I'm remembering right, I'll check again when I get home) about 2.63V. It is rock steady when on or off or the lamp coming on or off.

                          Checking the datasheet, if my memory is correct, the voltage looks a little high.
                          It is. The LDO regulators are usually specified as +- 1%. It's either the regulator or your meter.

                          PlainBill
                          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                          Comment

                            #93
                            Re: Sony SMD-HS73

                            Originally posted by PlainBill View Post
                            It is. The LDO regulators are usually specified as +- 1%. It's either the regulator or your meter.

                            PlainBill
                            I wouldn't be surpised at all if it was my meter. I've got 2 cheapie meters, and I'll try with both of them when I get back home today. On the presumption that even if both meters are inaccurate, they aren't likely to be inaccurate in exactly the same way and amount of error.

                            I should probably get a better multimeter for when I need accuracy rather than continuity checks.

                            But it will have to wait until after I get my ESR meter kit.

                            Comment

                              #94
                              Re: Sony SMD-HS73

                              Originally posted by torin3 View Post
                              I wouldn't be surpised at all if it was my meter. I've got 2 cheapie meters, and I'll try with both of them when I get back home today.
                              Back in post #9, you measured the 5V rail as 5.05V DC stable and you measured the regulator as 2.48V

                              PlainBill says that the 5V rail is usually regulated.

                              So 1.01 (1%) x 5.0 = 5.05V.

                              1.01 (1%) x 2.5 = 2.525V
                              0.99 (-1%) x2.5 = 2.475V

                              So I think the multimeter that you used in post #9 is okay?

                              Something has changed since then to cause this higher voltage reading (17V and now 2.63V). We had one case a few days back where the battery in the multimeter was low and causing funny readings. You may want to try a fresh battery?
                              --- 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

                                #95
                                Re: Sony SMD-HS73

                                Originally posted by retiredcaps View Post
                                Back in post #9, you measured the 5V rail as 5.05V DC stable and you measured the regulator as 2.48V

                                PlainBill says that the 5V rail is usually regulated.

                                So 1.01 (1%) x 5.0 = 5.05V.

                                1.01 (1%) x 2.5 = 2.525V
                                0.99 (-1%) x2.5 = 2.475V

                                So I think the multimeter that you used in post #9 is okay?

                                Something has changed since then to cause this higher voltage reading (17V and now 2.63V). We had one case a few days back where the battery in the multimeter was low and causing funny readings. You may want to try a fresh battery?
                                A correction, retiredcaps. LDO regulators, such as the AS1117-3.3, etc are spec'd +-1%. The 5V output is regulated, but the actual voltage is determined by a number of components added by the monitor manufacturer.
                                I'd expect it to be within 5%, but is often deliberately set high to compensate for drop through the conductors. 5.1V is very common.

                                PlainBill
                                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                Comment

                                  #96
                                  Re: Sony SMD-HS73

                                  Originally posted by torin3 View Post
                                  Ok, I had a chance to remeasure this morning. I was reading the wrong leg. Between ground and Vout I'm get about (If I'm remembering right, I'll check again when I get home) about 2.63V. It is rock steady when on or off or the lamp coming on or off.

                                  Checking the datasheet, if my memory is correct, the voltage looks a little high.
                                  What's been puzzling me is that when you measure the same voltage(s) a second time you seem to get something different each time. Like the 12V output going to 17V, the difference in the 2.5V voltage regulator output, the "bouncing" voltage feeding the CCFL controller, etc. Very confusing.

                                  Comment

                                    #97
                                    Re: Sony SMD-HS73

                                    Well, either I didn't remember correctly, or like mentioned, I might have a low battery, and it might be giving me screwy readings.

                                    2.5V regulator is at 2.49V on both meters right now. 3.3V regulator is 3.36VDC.

                                    And just to verify, I checked the 12V rail again. Up in the 17V range when peaking.

                                    Oh, and while it is somewhat frustrating, and I probably should be up so late before staring to work on this particular monitor, I am finding this process fascinating, and I'm learing quite a bit. Thanks again for all the help.

                                    Comment

                                      #98
                                      Re: Sony SMD-HS73

                                      Originally posted by torin3 View Post
                                      Voltages at the on/off pin are the same as before at CN1.

                                      Checking the Enable voltage from the oz960, I'm getting 1.17V for off, then frequent drops to about .5V.

                                      Should I be looking between pin 3 for U1 and the on/off location at CN1 for possible bad components? .
                                      What is the voltage on the enable pin #3 of oz960 when the back lights are on?
                                      Al.
                                      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                                      Comment

                                        #99
                                        Re: Sony SMD-HS73

                                        Originally posted by alexanna View Post
                                        What is the voltage on the enable pin #3 of oz960 when the back lights are on?
                                        Al.
                                        It is hard to say. I didn't get a 1 to 1 correlation for the .5V range for when the lamps were on. The voltage drop happened more often than the lamps came on. It might be that it was trying to turn them on more often than they acutally turned on. But the lights are on and then back off again so quickly that my meter can't say for certain exactly what the voltage was when they were on. There also may be spikes of more than the 1.17V, but if so they happened so quickly it didn't register on the meter.

                                        But the 1.17V reading was only when the light was off.

                                        Comment

                                          #100
                                          Re: Sony SMD-HS73

                                          Just out of curiousity, what is the part number for IC2 on the backside of the power board?
                                          --- 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

                                          Previous 1 2 3 4 5 6 template Next
                                          Working...