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HannsG HW173D dead. Recap = new fault.

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    #41
    Re: HannsG HW173D dead. Recap = new fault.

    On the solder side of the Board, put the -ve lead 0f your meter, to the -ve side of ANY of the 4 capacitors beside the heatsink(the -ve side is the one with the stripe running down the cap),and then the +ve lead of your meter to the centre pins of the two diode on the Heatsink,meter on DC Volts, range 20 or 100 volts,and what do you get ??

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      #42
      Re: HannsG HW173D dead. Recap = new fault.

      Originally posted by Rtech View Post
      On the solder side of the Board, put the -ve lead 0f your meter, to the -ve side of ANY of the 4 capacitors beside the heatsink(the -ve side is the one with the stripe running down the cap),and then the +ve lead of your meter to the centre pins of the two diode on the Heatsink,meter on DC Volts, range 20 or 100 volts,and what do you get ??
      0.0 on both. Thank you so much for working with me. I know it must be frustrating dealing with people new to this field. I have alway been interested in electronics, but never had the time....thx again.

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        #43
        Re: HannsG HW173D dead. Recap = new fault.

        Originally posted by slvfox2008 View Post
        I did check the continuity on both fuses and they check out.
        Do not use the continuity or "beep" feature of your multimeter for measurements. Some multimeters "beep good" for resistance readings less than 1.5k ohms.

        Always post the actual results of your measurements when asking for help.

        A good fuse should measure less than 1.0 ohms.
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          #44
          Re: HannsG HW173D dead. Recap = new fault.

          Originally posted by retiredcaps View Post
          Do not use the continuity or "beep" feature of your multimeter for measurements. Some multimeters "beep good" for resistance readings less than 1.5k ohms.

          Always post the actual results of your measurements when asking for help.

          A good fuse should measure less than 1.0 ohms.

          Both fuses I checked, meter set at 2k, reads .000. It was check while installed in the board. So these fuses are good.

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            #45
            Re: HannsG HW173D dead. Recap = new fault.

            Originally posted by slvfox2008 View Post
            Thank you so much for working with me.
            I went back and reread your first post. You never did explain what is wrong with your monitor other than just replacing the Capxon caps.
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              #46
              Re: HannsG HW173D dead. Recap = new fault.

              Originally posted by retiredcaps View Post
              I went back and reread your first post. You never did explain what is wrong with your monitor other than just replacing the Capxon caps.

              No power light.

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                #47
                Re: HannsG HW173D dead. Recap = new fault.

                1) Carefully measure the DC voltage across the largest capacitor (C114). It should be mains x 1.414. If you have 120V AC, then you should get 120 x 1.414 = roughly 165V DC.

                Careful, this is high voltage. Put your multimeter on 200V DC. Put your black probe on the negative leg of the capacitor and red probe on the positive leg.

                2) Now put your multimeter on 20V DC and measure voltage across the capacitor C123. Note if the voltage is steady of fluctuating.
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                  #48
                  Re: HannsG HW173D dead. Recap = new fault.

                  Originally posted by retiredcaps View Post
                  1) Carefully measure the DC voltage across the largest capacitor (C114). It should be mains x 1.414. If you have 120V AC, then you should get 120 x 1.414 = roughly 165V DC.

                  Careful, this is high voltage. Put your multimeter on 200V DC. Put your black probe on the negative leg of the capacitor and red probe on the positive leg.

                  2) Now put your multimeter on 20V DC and measure voltage across the capacitor C123. Note if the voltage is steady of fluctuating.
                  1) C114 is 160V

                  2) C123 is fluctuating

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                    #49
                    Re: HannsG HW173D dead. Recap = new fault.

                    Originally posted by slvfox2008 View Post
                    1) C114 is 160V

                    2) C123 is fluctuating
                    Okay, C114 is good for now.

                    C123 plays an important part of the startup SMPS process. These little caps can often fail but without visible bloating.

                    This is why forum members here recommend replacing ALL capacitors when you find bad ones on the power board. So replace the little cap and retest.

                    PS. What is the fluctating voltage on C123?
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                      #50
                      Re: HannsG HW173D dead. Recap = new fault.

                      Originally posted by retiredcaps View Post
                      okay, c114 is good for now.

                      C123 plays an important part of the startup smps process. These little caps can often fail but without visible bloating.

                      This is why forum members here recommend replacing all capacitors when you find bad ones on the power board. So replace the little cap and retest.

                      Ps. What is the fluctating voltage on c123?
                      5v - 11v

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                        #51
                        Re: HannsG HW173D dead. Recap = new fault.

                        Originally posted by slvfox2008 View Post
                        5v - 11v
                        If replacing the little cap doesn't solve the problem, the next step is to check U302. While you are replacing caps, you might as well replace the rest of the original power board caps with something like Panasonic FR, FM or FC caps.

                        What is the part number of U302 (the 8 pin chip) on the back of the power board?
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                          #52
                          Re: HannsG HW173D dead. Recap = new fault.

                          Originally posted by retiredcaps View Post
                          If replacing the little cap doesn't solve the problem, the next step is to check U302. While you are replacing caps, you might as well replace the rest of the original power board caps with something like Panasonic FR, FM or FC caps.

                          What is the part number of U302 (the 8 pin chip) on the back of the power board?
                          U302 is SP8K3 635.

                          All the caps had been replaced except C123. It had been replaced with a used one because I did not have a new one at the time. The new cap is doing the same as the old one.

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                            #53
                            Re: HannsG HW173D dead. Recap = new fault.

                            Originally posted by slvfox2008 View Post
                            U302 is SP8K3 635.
                            Hmm, U302 wasn't what I thought it would be (a PWM). This makes sense given the location of U302 (in the inverter section).

                            Usually on these types of boards, there is a 8 pin IC which is a pulse width modulator. I can't see one anywhere in the power section of the board?
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                              #54
                              Re: HannsG HW173D dead. Recap = new fault.

                              Originally posted by retiredcaps View Post
                              Hmm, U302 wasn't what I thought it would be (a PWM). This makes sense given the location of U302 (in the inverter section).

                              Usually on these types of boards, there is a 8 pin IC which is a pulse width modulator. I can't see one anywhere in the power section of the board?

                              My guess would be the single heatsinked device U101. It's probably a combined pwm/fet. What's the part number of U101?

                              Comment

                                #55
                                Re: HannsG HW173D dead. Recap = new fault.

                                Originally posted by retiredcaps View Post
                                Hmm, U302 wasn't what I thought it would be (a PWM). This makes sense given the location of U302 (in the inverter section).

                                Usually on these types of boards, there is a 8 pin IC which is a pulse width modulator. I can't see one anywhere in the power section of the board?
                                The PWM may well,be incorporated in the IC that is immediately below the Main Tfmr on the single heatsink, I cannot tell from the bottom actually how many pins it has ?? and the part number off that may supply the answer.

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                                  #56
                                  Re: HannsG HW173D dead. Recap = new fault.

                                  Originally posted by jetadm123 View Post
                                  My guess would be the single heatsinked device U101. It's probably a combined pwm/fet. What's the part number of U101?

                                  Do you mean U301?
                                  MPS 0633
                                  MPI008ES
                                  649455 19

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                                    #57
                                    Re: HannsG HW173D dead. Recap = new fault.

                                    Whai is the part number of device circled in yellow?
                                    Attached Files
                                    Last edited by jetadm123; 02-17-2011, 05:08 PM.

                                    Comment

                                      #58
                                      Re: HannsG HW173D dead. Recap = new fault.

                                      Originally posted by slvfox2008 View Post
                                      Do you mean U301?
                                      MPS 0633
                                      MPI008ES
                                      649455 19
                                      Tried Google and Alldata, and cannot find anything on those !!! So hope someone else has some luck.

                                      Comment

                                        #59
                                        Re: HannsG HW173D dead. Recap = new fault.

                                        Originally posted by jetadm123 View Post
                                        whai is the part number of device circled in yellow?
                                        1g45
                                        cm0465r

                                        Comment

                                          #60
                                          Re: HannsG HW173D dead. Recap = new fault.

                                          Originally posted by slvfox2008 View Post
                                          1g45
                                          cm0465r
                                          Now thats the one,combined PWM and FET....
                                          http://pdf1.alldatasheet.com/datashe...SCM0465RG.html

                                          Comment

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