Re: Vizio SV472XVT won't turn on
Yes I did! After the new power supply board didn't fix it, I ordered a new main board for it. Just swapped that out last night and it's working like a champ! Now I just need to verify the VGA input is working properly as it didn't pop up as a 3rd PC monitor, but that should just be a computer setting. I also noticed some horizontal lines appearing for a fraction of a second on fast motion or quick screen jumps. I believe it is just a de-interlacing issue with the 240hz smooth motion settings, so I'll just keep those turned off.
cmitchel
Member
Last Activity: 04-26-2016, 12:14 PM
Joined: 12-03-2014
Location: Shreveport, LA
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Re: Vizio SV472XVT won't turn on
So it sounds like the only thing I can do now is replace the main board. Once a new one is installed, will this fix the 24V going to inverter board and 18V/12V going to main board? I don't have a wiring diagram for any of these boards to see if those power circuits are passed through relays that need a switching circuit from the main board.Leave a comment:
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Re: Vizio SV472XVT won't turn on
I also checked the voltage across the main filter cap C804 and I have 161.3V.Leave a comment:
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Re: Vizio SV472XVT won't turn on
Ok, I got the new power supply board installed and no blown fuses so far, but TV still doesn't turn on. I've got power coming in and my Vizio logo is lit up orange. Measured voltages at connectors are as below:
All pins on CN2 going to inverter board read 0.0V (24V, SGDN2, A, B, C).
CN4, Pin 1, 18V, 0.0V
CN4, Pin 2, 18V, 0.0V
CN4, Pin 3, SGDN3, 0.0V
CN4, Pin 3, SGDN3, 0.0V
CN5, Pin 1, PSON, 0.0V
CN5, Pin 2, 12V, 0.0V
CN5, Pin 3, 12V, 0.0V
CN5, Pin 4, SGDN3, 0.0V...Leave a comment:
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Re: Vizio SV472XVT won't turn on
So I pulled the power supply board out, made sure I was using an outlet protected on a GFI breaker, plugged it up, and immediately tripped my breaker. I then made sure I had a good ground connection to the board, reset my breaker, and tried again only to get a spark out the board and a blown fuse. Replaced the fuse, put the board back on the TV chassis, plugged it in, and blew the second fuse. Tried one more time with a slightly higher ampacity fuse, only to get the same result.
So new board from ebay is on order...Leave a comment:
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Re: Vizio SV472XVT won't turn on
I did find a full working board for only $40 including shipping that I could get if need be.
[URL="http://www.ebay.com/itm/272162075486?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT"]http://www.ebay.com/itm/272162075486?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT[/URL]Re: Vizio SV472XVT won't turn on
I did find a full working board for only $40 including shipping that I could get if need be.
[URL="http://www.ebay.com/itm/272162075486?_trksid=p2060353.Leave a comment:
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Re: Vizio SV472XVT won't turn on
Budm,
Correct 0.0 DCV on all the connectors on the cold side currently (unless i need to replace a fuse on my multimeter). I'll pull the board out and check the voltage on C804 when I get home and report back.Leave a comment:
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Re: Vizio SV472XVT won't turn on
Unfortunately my main filter cap is under a large metal shield with no access to the top side. I'll have to unmount the whole board from the tv, flip it over, and make some leads to tie all the grounds back to the tv chassis as I can't tell if they are all connected electrically on the board.Leave a comment:
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Re: Vizio SV472XVT won't turn on
All I could get a reading on was the incoming power CN1,Pin1,L,120V / CN1,Pin3,N,0V. I also had 120V at both sides of the fuse. On connectors CN2 through CN6 going out to the other boards I got a reading of 0V on all pins, but previously I know I was reading some voltage. A few of the voltage regulators on the primary side (Q601, Q602, Q801, Q905) had around 58.8-60V at them along with the primary side of the D903 transformer. I may have fried something when I was reading the voltage off Q905 and my meter lead slipped and shorted across two of the...Leave a comment:
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Vizio SV472XVT won't turn on
Hello all. I am trying to get my TV working again and could use some help to determine where my problem lies.
[U][B]Backstory[/B][/U]
My TV doubles as a normal TV and a computer monitor for movies. A while back all my HDMI ports went out and I had to switch to component connections. From what I read, the HDMI ports are very sensitive to surges and can get fried even if using a surge protector power strip and the only fix was a new main board. Everything else about the TV worked fine, so I lived with using component video. Months later as I was watching TV my screen went... -
Re: New Members - please post your introductions here
Hello everyone! My name is Corey. Been having some trouble with my Vizio SV472XVT. First HDMI ports went and I lived with it for a while, but now my TV completely died and I need help seeing if I can revive it.Leave a comment:
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