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Vizio blue ray player

Discussion in 'Troubleshooting and Repair' started by banjomaniac, Jul 26, 2015.

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  1. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    I think my Vizio BR player may have suffered a surge from a storm. I pulled the power board and here is a pic, not a lot to it but any suggestions where to start or from parts, what is more likely gone bad? The 2 prong plug on top left of pic near the heat sink is ac power in.

    Banjomaniac
     

    Attached Files:

  2. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Hi banjoman,
    The picture is too small. Can you take another of the top half but a lot closer.

    What are the black components right under the the 2 pin connector?

    Martin
     
  3. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    Pics... Let me know if this is better?
    One is maybe a fuse but is covered with heat shrink. It shows continuity with my ohms meter and the other is a ceramic cap I think?


    IMG_20150726_073859_437.jpg IMG_20150726_082651_374.jpg
     
    Last edited by a moderator: Feb 22, 2016
  4. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Yes, better.
    That "ceramic", does it say CKE? Probably a MOV.

    Martin
     
  5. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    MF72
    10 IMG_20150726_094544_782.jpg D9
     
  6. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Yes, that seems to be a Thermistor. I would check that first.
    Have you powered up the board and checked whether there is voltage on the other side of the Thermistor.
    If you look underneath the board, you should see the F1 trace and continues through (series) the thermistor.
    Then keep checking for voltage along the traces.

    Martin
     
  7. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    There is voltage through that thermistor. Now I followed the board on past and there is a capacitor that shows 120vac on 1 side but not past the capacitor. Maybe that is normal but not sure or am I measuring it wrong? I measured 120vac at that 2 prong plug coming in then I left the neg lead there and I moved along and on the power side of cap I get 120 but nothing on other side.

    rhutson
     
    Last edited: Jul 28, 2015
  8. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Hi banjoman,
    That capacitor will go to ground. It is polarised, so has neg and positive terminals. But you should see 110 directly across it.

    Martin
     
  9. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    Well its a 47uf 400v capacitor and before it is 120vac and across it is 370vac. In the pic it is the bigger capacitor on top right.

    banjomaniac
     

    Attached Files:

  10. Martaine2005

    Martaine2005

    2,965
    817
    May 12, 2015
    Hi banjo,
    Sounds like you are getting good voltage on that cap. (doesn't mean it is good though).
    I would check the diodes next, put your meter to continuity and put meter leads to cathode and anode one way and then reverse the leads.

    Martin
     
  11. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    Look at this pic, is there supposed to be a surface mount resistor where I have arrows drawn, R40? The bad looking solder right at it there is my bad re solder of the big Capacitor, I since got a new solder tip and it is much easier now, I got a couple spot too hot trying to get the solder to melt, fixed. I labeled in yellow, some of the parts on the board too. Vizio back board.jpg
     
  12. davenn

    davenn Moderator

    13,668
    1,891
    Sep 5, 2009
    you should be measuring DC voltage across the big cap, not AC ... it's in the rectified mains section 250 - 300V odd DC
    the ONLY place you should be measuring AC and have your meter on AC measurement is at the input and through the fuse
    and up to the input to the 4 bridge rectifier diodes


    Dave
     
  13. banjomaniac

    banjomaniac

    68
    2
    Mar 3, 2013
    Ok, thanks Dave. I'll look at it again and check that cap.
     
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