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    Viewsonic n4060w w/FSP276-3F01 power supply

    I was given a Viewsonic n4060w w/FSP276-3F01 power supply from the guy next door along with a cap kit he bought off ebay for the secondary side. He never got around to installing the caps but thought it was the problem. I installed them and there was no change.

    Should this TV have a red standby LED when the unit is plugged in and turned off?

    When I press the power button the LED lights up green (no flashing, solid green till I power down). I connected a DVD player to it and tried blindly to find the right input to see if there was sound and either didn't find it or there isn't any sound.

    #2
    Re: Viewsonic n4060w w/FSP276-3F01 power supply

    What are the brand and series of the replacement caps? Did you replace all the caps? I know Viewsonic loves crappy caps like CapXon so all of them should be replaced. It helps a lot to post some high resolution pictures of the board in question

    Comment


      #3
      Re: Viewsonic n4060w w/FSP276-3F01 power supply

      I believe the replacements are Nicholson (or something like that). Not all the caps were replaced, but every cap on the secondary side is new.

      Is there no red standby LED on this model?
      Attached Files

      Comment


        #4
        Re: Viewsonic n4060w w/FSP276-3F01 power supply

        They look like nichicon which is good. I would still replace all of the little caps, they look like CapXon (I have seen them dry out in a few Viewsonic monitors) That big blue cap, did you install that too? Either way, measure the DC voltage across it, but be careful, don't touch anything while it's on

        Comment


          #5
          Re: Viewsonic n4060w w/FSP276-3F01 power supply

          Originally posted by Pentium4 View Post
          They look like nichicon which is good. I would still replace all of the little caps, they look like CapXon (I have seen them dry out in a few Viewsonic monitors) That big blue cap, did you install that too? Either way, measure the DC voltage across it, but be careful, don't touch anything while it's on
          No, I didnt install the big blue one. I can borrow a multimeter, just need some instruction on how to use it. Would I be getting a green light when I press power button if the primary side is the problem? Wouldn't the green light mean I do have standby voltage?

          I will try and get the specs off those tiny ones on the primary side so I can search Newark electronics (unless someone has these part numbers?)

          Comment


            #6
            Re: Viewsonic n4060w w/FSP276-3F01 power supply

            "When I press the power button the LED lights up green (no flashing, solid green till I power down)" That means the stby power supply is working. Good clear pictures of you board, both sides.We need to find out if the main board is sending the PS_ON to the power supply board or not.
            reaD: Baisc LCD TV and Monitor troubleshooting guides.
            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


              #7
              Re: Viewsonic n4060w w/FSP276-3F01 power supply

              Hope these are close up enough.. I tried scanning the board in my scanner but it was blurry and too big to post.

              I looked it over before I bothered with the caps and to my untrained, noob eyes nothing jumps out at me.

              Does standby power working mean the problem should be on the secondary side? if its the PSU thats the problem
              Attached Files
              Last edited by 6of1; 09-04-2013, 05:24 PM.

              Comment


                #8
                Re: Viewsonic n4060w w/FSP276-3F01 power supply

                Can you redo the picture of the whole bottom side (pic 1), it is blurry?
                Next step is to find out if the DC voltage on that LARGE blue cap will be at around 380~400VDC when you hit the power switch, at OFF mode it should have about 160~170VDC measure right at the two legs of the cap, be careful no to touch anything with your hands, to be safe you should plug the TV into the GFCi outlet.
                Last edited by budm; 09-04-2013, 09:17 PM.
                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


                  #9
                  Re: Viewsonic n4060w w/FSP276-3F01 power supply

                  Here is a new pic of the backside. Hope its clean enough (I'm taking these pics with an iPhone).

                  Going to reinstall the PS in the Tv to test big blue cap (per buds instructions) now, thanks guys.
                  Attached Files

                  Comment


                    #10
                    Re: Viewsonic n4060w w/FSP276-3F01 power supply

                    Ok, big blue cap tested.

                    Off: 155~165
                    TV Power on: Shot right to 400

                    Comment


                      #11
                      Re: Viewsonic n4060w w/FSP276-3F01 power supply

                      Did it stay at, or around 400V (380 to 410V)?
                      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


                        #12
                        Re: Viewsonic n4060w w/FSP276-3F01 power supply

                        I will give more detail.

                        Power Off: holds at 164~166
                        Power On: holds at 401~405

                        both times I was holding the meter on the cap for 4 mississippi's

                        eeekk! I thought I would test again just to be sure and the second time I did the above I got
                        Power Off: holds at 162~164
                        Power On: holds at 393~396

                        Why would it change and does this matter?
                        Last edited by 6of1; 09-05-2013, 11:14 AM.

                        Comment


                          #13
                          Re: Viewsonic n4060w w/FSP276-3F01 power supply

                          OK, that means the PS_ON signal is good because it does turn on the PFC Voltage booster circuits, so now we need to find out if the 12V/24V is also turn on. If you check the 24V output on the connector that goes to the Inverter board, are you getting the 24VDC, if not , then we need to troubleshoot the 12V/24V switching power supply circuit next.
                          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


                            #14
                            Re: Viewsonic n4060w w/FSP276-3F01 power supply

                            Does anyone have a schematic/pinout for this board that tells me which pins on the inverter board connector I should be checking? The board doesn't seem to have any info printed on it like some of the ones I see other people posting here. I found this one: , but it doesn't seem to have what Im looking for (if I even know what I'm looking for, lol). I even looked in Tom66 sig database..

                            And when I know what pin I should be checking for 24v can I use the chassis as ground?
                            Last edited by 6of1; 09-05-2013, 12:49 PM.

                            Comment


                              #15
                              Re: Viewsonic n4060w w/FSP276-3F01 power supply

                              Pin outs, chassis as ground ref.
                              Service manual (not complete):
                              Attached Files
                              Last edited by budm; 09-05-2013, 03:27 PM.
                              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


                                #16
                                Re: Viewsonic n4060w w/FSP276-3F01 power supply

                                Ty Bud!

                                Ok, testing the connectors using the screw/eyelet as ground ref I get the following:

                                CNS1
                                Pin 1: 4.7
                                Pin 2: 2.0
                                Pin 3: 0
                                Pin 4: 0
                                Pin 5: 0

                                CNS2
                                Pin 1: 4.7
                                Pin 2: 2.0
                                Pin 3: 0
                                Pin 4: 0
                                Pin 5: 0

                                CNS3
                                Pin 2: 11.97
                                Pin 3: 11.97
                                Pin 4: 11.97
                                Pin 9: 4.98
                                Pin 10: 4.98
                                Pin 11: 4.98

                                I must be soaking this in b/c now I know its the power supply!
                                TY, again for the pinout!! Whats next?

                                Comment


                                  #17
                                  Re: Viewsonic n4060w w/FSP276-3F01 power supply

                                  OK,that does not make sense since you are getting the 12V form the same transformer that is used to produce the 24V also, as you can see, the 24V section uses two rectifiers for full-wave rectification to produce 24V at the center pin of the rectifier Diodes. I would check and see if the 24V terminal of the connector will show low resistance reading all the way back to the center pin of those two rectifier. Unless BOTH of the rectifiers are open, which is not likely. or open 2 windings of the 24V transformer section. Measure using ground as I show on the picture for the 24V testing or verify that that ground is also connected to the 24V OUTPUT GROUND PINS.
                                  Attached Files
                                  Last edited by budm; 09-05-2013, 05:25 PM.
                                  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


                                    #18
                                    Re: Viewsonic n4060w w/FSP276-3F01 power supply

                                    Im so sorry.. The reason it doesn't make sense is because I was looking at the inverter connectors upside down I didn't see the little #1 so the correct readings should be:

                                    CNS1
                                    Pin 1: 24.3
                                    Pin 2: 24.3
                                    Pin 3: 24.3
                                    Pin 4: 24.3
                                    Pin 5: 24.3

                                    CNS2
                                    Pin 1: 24.3
                                    Pin 2: 24.3
                                    Pin 3: 24.3
                                    Pin 4: 24.3
                                    Pin 5: 24.3

                                    I feel so stupid
                                    Sorry about that one, tryin to keep you all on your toes.

                                    Comment


                                      #19
                                      Re: Viewsonic n4060w w/FSP276-3F01 power supply

                                      OK, good, you power supply is working and the Main board is sending out the PS_ON to turn on the 12V and the 24V power supplies.
                                      So next board we need to look will be the Inverter board. Take good pictures and any labels that indicate the functions of ech pin on the connector that goes back to the power supply board will be next.
                                      By the way, the voltage reading are from all the boards are connected, right?
                                      Last edited by budm; 09-05-2013, 09:05 PM.
                                      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


                                        #20
                                        Re: Viewsonic n4060w w/FSP276-3F01 power supply

                                        well I have her opened up and I guess I have 2 inverter boards? one on either side of the screen. The one has what my limited knowledge looks like burnt area. I tried taking pictures but the lighting was so awful I need to find a lamp.

                                        Question though, If I have 2 inverter boards and the screen is black on both sides does that mean the both of them are probably messed up?

                                        Ok, looking for a lamp, hope to have pics up soon!

                                        Originally posted by budm View Post
                                        By the way, the voltage reading are from all the boards are connected, right?
                                        I missed this question..
                                        No the inverter cables were disconnected. Is that bad?

                                        Ok Pics are up of board 1. In pic 4 you can hopefully see the discoloration of the thick traces.
                                        Attached Files
                                        Last edited by 6of1; 09-06-2013, 04:21 PM.

                                        Comment

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