Viewsonic vp2130b & vx2235wm

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Blackstar
    Member
    • Mar 2015
    • 11
    • USA

    #1

    Viewsonic vp2130b & vx2235wm

    Hello I have 2 viewsonic monitors that are having trouble vp2130b & vx2235wm. Since I registered on these great forums I thought I would make a post on what I'm doing.

    vp2130b turns on and off repeatedly.
    None of the caps physically look bad on any of the boards.
    The power supply shuts off and turns back on when either back lights are plugged into the inverter board. Hopefully I didn't damage any other components when testing point of failure. The power supply board got hot and smelt small amount of burning from the transformer when the monitor was turning off and on repeatedly. I took caps off the inverter board too try to determine if they are bad. None of them seen horribly awful besides one that had a larger ESR then the others. Any input with this problem would be appreciated.

    vx2235wm turns on then shuts off until it warms up.
    Upon inspection of the vx2235wm power supply their are several bulging caps.

    I just got my capacitor order from digikey so I will post back shortly with more information.

    What is a good substance to hold down caps on a pcb board? I was thinking hotglue or silicon.
    Attached Files
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9532
    • Canada

    #2
    Re: Viewsonic vp2130b & vx2235wm

    You do not have to glue them down, just solder them in place

    Comment

    • Blackstar
      Member
      • Mar 2015
      • 11
      • USA

      #3
      Re: Viewsonic vp2130b & vx2235wm

      Replaced the caps on the vx2235wm and it lives once again!

      The transformer is bad on my vp2130b. Replaced all the caps on the inverter, power, and video board. I thought maybe the solder joints where bad so I removed the transformer and redid the solder joints on the pin header. There is little to no resistance on the secondary windings .05 ohms. The primary only has a slightly higher resistance. When the transformer is on it buzzes quite loudly. I can hear a moving part inside the transformer when I shake the board

      I attached a short video of a 2 second black out vp2130b.zip or the link below.

      <Link Removed>
      What do you guys think?

      Is it worth trying to find a new transformer or should I just buy another board? I can get one on eBay for $20.
      Attached Files
      Last edited by SMDFlea; 07-31-2021, 06:33 AM.

      Comment

      • Agent24
        I see dead caps
        • Oct 2007
        • 4930
        • New Zealand

        #4
        Re: Viewsonic vp2130b & vx2235wm

        Sure it's not a shorted rectifier or other part on the secondary side? Main SMPS transformers hardly ever go bad. Inverter transformers on the other hand...
        "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
        -David VanHorn

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Viewsonic vp2130b & vx2235wm

          Originally posted by Blackstar
          Replaced the caps on the vx2235wm and it lives once again!

          The transformer is bad on my vp2130b. Replaced all the caps on the inverter, power, and video board. I thought maybe the solder joints where bad so I removed the transformer and redid the solder joints on the pin header. There is little to no resistance on the secondary windings .05 ohms. The primary only has a slightly higher resistance. When the transformer is on it buzzes quite loudly. I can hear a moving part inside the transformer when I shake the board

          I attached a short video of a 2 second black out vp2130b.zip or the link below.

          <Link Removed>
          What do you guys think?

          Is it worth trying to find a new transformer or should I just buy another board? I can get one on eBay for $20.
          Doubt that the transformer is bad, the DCR of the power transformer will be very low, you have to use inductor tester to test the inductance and the ringer for testing to see if it has shorted turn.
          Transformer will have very high Inductive reactance when it is exposed to the high frequency switching Voltage which is used in the switching power supply. You use Ohm meter to verify if the winding is open or not.
          2-second to black can be due to bad inverter circuits, bad lamps, bad power supply, bad inverter transformer.
          Last edited by SMDFlea; 07-31-2021, 06:33 AM.
          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

          • Agent24
            I see dead caps
            • Oct 2007
            • 4930
            • New Zealand

            #6
            Re: Viewsonic vp2130b & vx2235wm

            By the way the test in your video is not accurate. You have not connected all the lamps to the inverter. Then the inverter will think some lamps are bad (open circuit) and shutdown anyway.
            "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
            -David VanHorn

            Comment

            Related Topics

            Collapse

            • Tynan Dill
              Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
              by Tynan Dill
              I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

              Upon bringing it home and plugging it up, it showed a standby light.

              I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

              The screen seems to blackout and stay black, but with a flashlight I can see the display.

              With my Playstation 4 connected via HDMI, and running a game I can hear sound.

              Assuming...
              11-22-2024, 01:46 PM
            • m1ch43lzm
              HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
              by m1ch43lzm
              Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
              Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
              05-12-2025, 08:37 PM
            • Hakuu
              LG OLED77G1PUA - No Video / Audio after a TCON Board change and Software Update
              by Hakuu
              Hi There,

              This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.

              After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.

              More Details

              TV Model - LG OLED77G1PUA

              Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt...
              07-12-2023, 02:37 PM
            • jb_Bak
              Sony xbr-65x900c main board issues?
              by jb_Bak
              Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.

              Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
              Power Board Connector that goes to Main board
              CN6401
              Pin 01 NC
              Pin 02 NC
              Pin 03 "BL_ON": 0V
              Pin 04 "N/C"
              Pin 05 "STBY 3.3V": 3.5V
              Pin 06 "GND": N/C
              Pin 07 "AC_OFF"...
              09-27-2021, 04:52 PM
            • canadaboy25
              Panasonic TC-P54VT25 No image. A or D board?
              by canadaboy25
              I have a Panasonic TC-P54VT25 that will power on and prime the display but there is no image at all.

              The panel is primed as there is a slight glow from the entire panel. This means the problem should be logic related. The service manual also confirms this and recommends replacing the A or the D board.

              I have tried to get the TV to display the test sequence but I have been unable to and I don't even know if this TV has a test sequence or not. I tried following tom66's instructions in post #3 on this thread https://www.badcaps.net/forum/showthread.php?t=26790. There was...
              01-17-2021, 01:06 AM
            • Loading...
            • No more items.
            Working...