ilo V27DMBX dead totally

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA

    #1

    ilo V27DMBX dead totally

    ilo V27DMBX totally dead. no light on the front or anything. On the power supply I found 2 bad mosfets and the main cap was bad so replaced all those and the blown fuse. Same thing all dead. No caps are swollen and I replaced what I think was the start up cap and still totally dead. I have zero volts at all the pins on the connector. I know there must be an open someplace I think. I just can't find any info on this and there is no voltages printed on the board next to the plug so no clue what is to be there. The board is PN 6693006602
    Attached Files
  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA

    #2
    Re: ilo V27DMBX dead totally

    Another picture with the heat shield removed.
    Attached Files

    Comment

    • CraigR
      Badcaps Veteran
      • Dec 2013
      • 959
      • USA

      #3
      Re: ilo V27DMBX dead totally

      found another 22uF cap under that shield and replaced now also with same result. Plugged in on bench and only have 165V at the big cap.

      Comment

      • CraigR
        Badcaps Veteran
        • Dec 2013
        • 959
        • USA

        #4
        Re: ilo V27DMBX dead totally

        I just pulled 7 of the ceramic caps (blue brown) and checked with my meter and those are ok also. I'm just lost on this one. Can anyone help?

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #5
          Re: ilo V27DMBX dead totally

          Can you post a picture of the bottom of the Power board - which cap did you think was the start up. C26? Can you have only the power supply connected and check the connector that goes to the main board for 5v standby? Have you checked diodes and resistors for open?
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 30937
            • Albion

            #6
            Re: ilo V27DMBX dead totally

            it's possible the shorted fets damaged whatever was supplying the signal to the gate pins.

            Comment

            • CraigR
              Badcaps Veteran
              • Dec 2013
              • 959
              • USA

              #7
              Re: ilo V27DMBX dead totally

              I replaced C15 and C26 I have zero volts on all the pins going to the main board Checked all diodes and resistors on top and are ok.
              Attached Files

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #8
                Re: ilo V27DMBX dead totally

                last pic is not really clear enough for troubleshooting - perhaps try in 2 halves
                are the 4 black dots in a row the bridge rectifier? I usually try and find that to get my bearings
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • CraigR
                  Badcaps Veteran
                  • Dec 2013
                  • 959
                  • USA

                  #9
                  Re: ilo V27DMBX dead totally

                  Not sure if this is any better. This is with my webcam. My regular camera wont focus that close.
                  Attached Files

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: ilo V27DMBX dead totally

                    So which two MOSFETs did you replace? The two next to each other are for driving the main transformer, the one by itself is for the PFC Voltage booster.
                    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

                    • CraigR
                      Badcaps Veteran
                      • Dec 2013
                      • 959
                      • USA

                      #11
                      Re: ilo V27DMBX dead totally

                      one is at Q20 on big heatsink and the other is Q17 on other heatsink that are next to each other. I also just checked the surface resistors on the bottom for an open and nothing.

                      Comment

                      • selldoor
                        Slow Learner
                        • Dec 2010
                        • 7870

                        #12
                        Re: ilo V27DMBX dead totally

                        Hi
                        Pics are a little better here is a sort of schematic


                        In with the group of secondary capacitors there is an inductor L2 can you test it for continuity.
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                        • CraigR
                          Badcaps Veteran
                          • Dec 2013
                          • 959
                          • USA

                          #13
                          Re: ilo V27DMBX dead totally

                          L2 checks good!

                          Comment

                          • CraigR
                            Badcaps Veteran
                            • Dec 2013
                            • 959
                            • USA

                            #14
                            Re: ilo V27DMBX dead totally

                            On the underside there are 2 510k resistors connected together and put in some black shrink tube. I found that they were open so I ordered those and once I get those in I will report back.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: ilo V27DMBX dead totally

                              Picture in post 2, it looks like one of the resistor (<1 Ohm) is for the Source pin and primary Ground (Negative leg of the main cap), and another resistor (in 1000'S of Ohms) is part of the snubber circuit.
                              Can you show the picture of the two resistors with the shrink tubing removed? Also the MOSFET for the PFC, when it shorted out it may have taken out the PFC IC also.
                              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

                              • CraigR
                                Badcaps Veteran
                                • Dec 2013
                                • 959
                                • USA

                                #16
                                Re: ilo V27DMBX dead totally

                                Here is the picture where the 2 resistors came off and I circled where they connected. I also have a pic of the resistors. I did go and check all the mosfets and they checked out ok.
                                Attached Files

                                Comment

                                • CraigR
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 959
                                  • USA

                                  #17
                                  Re: ilo V27DMBX dead totally

                                  Well I replaced those 2 resistors today and still got squat.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: ilo V27DMBX dead totally

                                    OK, those two 510K resistors are not the one I am asking about, they are these 3 resistors.
                                    Attached Files
                                    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

                                    • CraigR
                                      Badcaps Veteran
                                      • Dec 2013
                                      • 959
                                      • USA

                                      #19
                                      Re: ilo V27DMBX dead totally

                                      Here is a picture.
                                      Attached Files

                                      Comment

                                      • CraigR
                                        Badcaps Veteran
                                        • Dec 2013
                                        • 959
                                        • USA

                                        #20
                                        Re: ilo V27DMBX dead totally

                                        Ended up scraping it out.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • badboyzzz
                                          Nvidia Shield P2897 dead
                                          by badboyzzz
                                          There is a problem with nvidia shield 2019 p2897. The lights of the device are on but there is no voltage in the red marked areas. The green areas are normal and the chip in the yellow area is heating up in long-term voltage. Does anyone have a diagram or an idea? Thanks in advance




                                          ...
                                          04-05-2025, 03:56 PM
                                        • Mike Russell
                                          Lenovo 14ALC6 - NMD521 - No power, totally dead.
                                          by Mike Russell
                                          Machine won't power on, no power led, no fan spin, completely dead.

                                          Checked PQ5400 - AONS32314 and pins 5,6,7,8 are 20v (AC adaptor voltage) but pins 1, 2, 3, 4 are 0v.

                                          Following Gate Pin 4 to PU5400 - BQ24780SRUYR.

                                          VCC 20v
                                          ACDET 2.8v
                                          ACDRV 0v (goes to pin 4 gate of AONS32314).
                                          ACOK 0v
                                          REGN 6v

                                          According to datasheet, conditions are correct for ACOK to be high but it is not.

                                          Tracing ACOK it's connected to ACIN which is connected to a pin GPB0 of IT8227 but also shown as connected to +3VL via a 100k resistor...
                                          12-25-2024, 08:31 AM
                                        • phantomEVO
                                          [HELP] 2 Imac 820-2641 TOTALLY DEAD: NO LED/1 LED
                                          by phantomEVO
                                          hi to all! please help with 2 imac 21,5 dead...

                                          i already changed u7700 in both without luck

                                          u7700 pin 17, 18, 5, 4, 24, 12

                                          have those voltages in both imac..

                                          12v, 5v, 5v, 5v, 0,3v, 3,9v

                                          i have 3V3_S5 (L7710) in one imac (one led) but no 5v on L7750

                                          NO SHORT ON L7750

                                          i have not 3V3_S5 (L7710) in the other (no led)

                                          PLEASE HELP I'M GOING CRAZY!!
                                          01-25-2024, 01:46 PM
                                        • pixellegolas
                                          Lenovo yoga 3 pro, totally dead
                                          by pixellegolas
                                          Hi!

                                          I have this laptop and first let's go through what happened

                                          Went totally dead, no reaction
                                          I thought it was the adapter so I bought a new one = nothing happened
                                          Opened up the laptop and adjusted the battery cable = Started working
                                          Worked a couple of days and then went totally dead again

                                          Now nothing works

                                          I have opened the laptop, removed basically all removable components. It does not start without the battery or harddrive or anything disconnected.

                                          Testing with voltmeter I can see 5.3V basically...
                                          09-05-2020, 11:16 AM
                                        • double_DD
                                          How can I be sure that my EC chip is dead?
                                          by double_DD
                                          Hi all,

                                          As the title suggests, how can I be sure that my EC chip is really dead?

                                          I've recently gotten into this hobby of laptop repairs, and have successfully brought back to life a couple with some easy fixes, mostly shorted caps.

                                          Now I'm working on HP Probook 455 G8, that had some "devil" run around on 3V line, burning a bunch of stuff. Luckily I have a dead 455G7 (for spare parts) so I managed to fix it (swapped burned parts) to a point that it will charge (both on barrel jack and usb-c), but it doesn't want to turn on. There is a 3V3 on a keyboard...
                                          03-12-2025, 07:47 AM
                                        • Loading...
                                        • No more items.
                                        Working...