Vizio P50HDM power on but no picture

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  • Daveleone
    Badcaps Veteran
    • Apr 2016
    • 267
    • USA
    #1

    Vizio P50HDM power on but no picture

    Hi all! I have a Vizio P50HDM. I can turn the power on and the power will stay on, but there is no picture. I've taken some voltage measurements with power plugged in but TV off, and then with TV turned on. Please help me diagnose!

    Power Supply (IMG_3751)
    ==========
    CN806 Voff Von
    ------
    VS 0.78 190v
    VS 0.78 190v
    VS 0.78 190v
    NC 0 0
    GND 0 0
    GND 0 0
    GND 0 0
    GND 0 0
    Va 0.56 58v
    Va 0.56 58v

    CN805
    ------
    GND 0 0
    GND 0 0
    5vctrl 0 5.11
    5vctrl 0 5.11

    CN804
    ------
    9Vsc 0 8.94
    9Vsc 0 8.94
    GND 0 0
    5Vsc 0 5.11
    5Vsc 0 5.11
    5Vsc 0 5.11
    GND 0 0
    GND 0 0

    CN803
    ------
    5Vsc 0 5.13
    5Vsc 0 5.13
    5Vsc 0 5.13
    GND 0 0
    GND 0 0
    GND 0 0
    12Vsc 0 11.96
    12Vsc 0 11.96
    GND 0 0
    GND 0 0
    12Vfon 0 11.94
    12Vfon GND 0 0

    SW502
    -------
    30v 0 5.14
    24v 0 0

    CN809
    ------
    9Vsc 0
    GND 0

    CN802
    ------
    30v 0 24.0
    24v 0 0
    GND 0 0
    GND 0 0

    CN801
    ------
    ACD No wire
    RLY-ON 0 4.60
    5Vsb 5.05 4.90
    GND 0 0
    Vs-ON 0 4.60
    5VD No wire
    NC No wire

    Ysus (IMG_3748)
    ====
    Fuses (I pulled them out and tested for continuity)
    ------
    FS2 OK
    FS3 OK

    P11
    ---
    +5V 0 5.02
    +5V 0 5.02
    GND 0 0
    GND 0 0
    GND 0 0
    GND 0 0
    NC 0 0
    +VA 0.56 60.2v
    +VA 0.56 60.2v
    NC 0 0
    +VS 0.79 193v
    +VS 0.79 193v

    P6
    --
    GND 0 0
    GND 0 0
    GND 0 0
    GND 0 0
    +5V 0 5.06
    +5V 0 5.06
    +5V 0 5.06
    +5V 0 5.06

    P3 (this one is strange - negative voltage readings? guessing most pins need a scope, but voltages are still confusing for GND and +5V??)
    --
    GND 0.08 -10.3
    +5VF 0.08 -5.5
    GND 0.08 -5.5
    VNSC 0.08 -11.3
    OC1 0 -6.9
    OC2 0 -10.9
    DATA 0 -7.2
    STB 0 -7.3
    GND 0.08 -11.9
    ELK 0 -10.9
    GND 0.08 -11.9

    P2
    --
    GND 0 0
    GND 0 0
    +5V 0 5.06
    +5V 0 5.06
    VA 0.55 60.4v
    VA 0.55 60.4v

    -Vy Test Points (also strange negative voltage reading) (IMG_3748b)
    -----------------------------
    -Vy TP (top) 0.12 113.9v
    -Vy TP (bottom) 0.12 -83.9v

    Connection from Ysus to YDRV boards (also strange negative voltage readings) (IMG_3747)
    ------------------------------------
    Top 0.08 -12.3v
    Middle 0.02 59.5v
    Bottom 0.08 -12.3v

    Zsus (IMG_3752)
    ====
    P152
    ----
    GND 0 0
    GND 0 0
    +5V 0 5.06
    +5V 0 5.06
    NC 0 0
    VA 0.55 60.5v
    VA 0.55 60.5v

    P153
    -----
    VA 0.55 60.5v
    VA 0.55 60.5v
    +5V 0 5.06
    +5V 0 5.06
    GND 0 0
    GND 0 0

    I know from reading the other threads IPMs are the usual cause. Is that the case here based on these readings? Or do I just have bad panel? or?? Let me know what seems out of the ordinary and your thoughts!

    Thanks,
    --Dave
    Last edited by Daveleone; 09-04-2016, 01:38 PM.
    Tags: None
    • Daveleone
      Badcaps Veteran
      • Apr 2016
      • 267
      • USA
      #2
      Re: Vizio P50HDM power on but no picture

      Photos
      Attached Files

        Comment

        • Daveleone
          Badcaps Veteran
          • Apr 2016
          • 267
          • USA
          #3
          Re: Vizio P50HDM power on but no picture

          bump. Anyone have any input here? Thanks!

            Comment

            • Daveleone
              Badcaps Veteran
              • Apr 2016
              • 267
              • USA
              #4
              Re: Vizio P50HDM power on but no picture

              Originally posted by nicholas110
              .
              Originally posted by aaronwt6
              .
              Originally posted by tom66
              .
              Originally posted by tw2005
              .
              Originally posted by Alastair_E
              .
              Originally posted by PlainBill
              .
              Gents, any help here?
              Last edited by Daveleone; 09-09-2016, 04:30 AM.

                Comment

                • tvtimmy
                  Badcaps Legend
                  • Mar 2015
                  • 1160
                  • usa
                  #5
                  Re: Vizio P50HDM power on but no picture

                  On the top right side of the mainboard there are 3 white smd fuses. Check if one is open.

                    Comment

                    • Daveleone
                      Badcaps Veteran
                      • Apr 2016
                      • 267
                      • USA
                      #6
                      Re: Vizio P50HDM power on but no picture

                      Originally posted by tvtimmy
                      On the top right side of the mainboard there are 3 white smd fuses. Check if one is open.
                      Thanks for the reply!

                      F2, F3, and F4 all check OK for continuity.

                      Do the voltage readings I posted in my original post look correct? Any of them look wrong to you based on your knowledge of these TVs?

                      Thanks!
                      --Dave

                        Comment

                        • ReeceyBurger123
                          Never Give Up !
                          • May 2014
                          • 7325
                          • Britain
                          #7
                          Re: Vizio P50HDM power on but no picture

                          Seems like your sus voltages are up but what does Ysc and Zbais measure ? Also in a dark room does the screen appear to glow ?
                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                          https://www.facebook.com/Telford-Tel...7894576335359/

                            Comment

                            • Daveleone
                              Badcaps Veteran
                              • Apr 2016
                              • 267
                              • USA
                              #8
                              Re: Vizio P50HDM power on but no picture

                              Thanks for the help. Sorry I was away for a while - had some other things come up.

                              No glow when the TV is powered on in a dark room.

                              Could you help point out on the pictures I uploaded where the Ysc and Zbias test points are? I see the word ZBIAS on the Zsus board, but there's no obvious test point there so I'm not sure where to measure the voltage. And I couldn't find Ysc.

                              Thanks!

                                Comment

                                • Daveleone
                                  Badcaps Veteran
                                  • Apr 2016
                                  • 267
                                  • USA
                                  #9
                                  Re: Vizio P50HDM power on but no picture

                                  Originally posted by ReeceyBurger123
                                  Seems like your sus voltages are up but what does Ysc and Zbais measure ? Also in a dark room does the screen appear to glow ?
                                  Can you help me find those test points?

                                    Comment

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