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Vizio blue ray player

banjomaniac

Mar 3, 2013
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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
 

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Martaine2005

May 12, 2015
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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
 

banjomaniac

Mar 3, 2013
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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
 
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Martaine2005

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

Martin
 

Martaine2005

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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
 

banjomaniac

Mar 3, 2013
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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
 
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Martaine2005

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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
 

banjomaniac

Mar 3, 2013
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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
 

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Martaine2005

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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
 

banjomaniac

Mar 3, 2013
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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
 

davenn

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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

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
 
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