Re: Vizio VO47LF 0500-0407-0680 PS board
OK, Thanks for the help, I just can't see getting $50-60 invested in fixing this one, when I can get one with 2 year warr. for $70.
Thanks again,
Kevin -- Tinkerer973
tinkerer973
Member
Last Activity: 12-08-2014, 11:29 PM
Joined: 11-17-2014
Location: Hortonville, Wi
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Re: Vizio VO47LF 0500-0407-0680 PS board
No, the chip is only $2.80 but the only place I can find it, only ships DHL and they want $27 shipping. If I knew a little about the chip, maybe I could find a suitable repalcement, but I can't find anything on it.... If I'm gonna pay $30 for the chip and shipping, I'm 1/3 of the way to a new PS board already. Any ideas before I order the PS board?Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Well, parts finally showed up today, Both R901 & R601 got replaced, Mosfet is changed and the C901 High Voltage cap is back in, still no standby power, I'm only getting .20V from the source and gate pins to the Neg. lead of the big cap, with it not turing on, that might be normal, but I think I should be looking at .20v output on more than one leg of the IC inline. I'm thinking the IC is locked open or fried all together. Is it possible that there is no good path to ground so theres no output from the MOSFET? Any thoughts???Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Sounds good, thanks a ton, we'll see how much the ic is, maybe I'll change it anyway, I just hate SMC so much, lol , my hands aren't as steady as they used to be..... Thanks Again, Have a good evening
KevinLeave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
ok, one more question, then I think I'm off to order parts, Are these PS boards like a computer supply in respect to needing a load to run, will it give me voltage at the main board connector without connnecting it to the main board.Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
ok, so even though r907,906 and D902 still test good probably replace them and the IC, along with the mosfet, R901 and is C901 still good....am I gonna hurt anything outside of those compents if I replace the Mosfet and the r901 and try it. Can I cause more damage if IC900 is damaged and I dont replace it?
For R901 the fusible resistor, that is about the size of a typical 1/4 watt resistor, thats basicly a flameproof resister of the correct value at 1/4 w , right?Last edited by tinkerer973; 11-19-2014, 06:40 PM.Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Gate to drain 1.23K
gate to source 1.8 ohms
drain to source 1.14K
Full model number is vizio VO47L FHDTV30ALast edited by tinkerer973; 11-19-2014, 06:15 PM.Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Aha, R901 is open, with closer inspection I can see a tiny amout of burn on the board under it as well. How I missed that i don't know. Here are some more pics, one is of the whole board the other 4 are kinda quarter shots of the board. along with retake of the 2nd pic...Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Indeed, out of curcuit res is >20M, on 20M setting I still get OL, retest of resistance on the board without C901 installed is 1.100K.Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Ok, resistance across C901 is 1.08K, here's a pic of the bottom of that area, one is pretty clear, the other is a little blurry but of a larger area. Thanks for taking the time to help me out. Kevin...Leave a comment:
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Re: Vizio VO47LF 0500-0407-0680 PS board
Yup, that is my exact board, I'll try to get a few pics posted later. I didn't see anything unusual, except one blue cap( tantalum I think)c901 near Q901 has a dark spot under it looks like heat mark to me but could be normal, that and all the really poor soldering, wow, what passes for good these days....anyway across the big cap I have 168vdc, neg. meter lead to chassis pos. meter lead to pos. on the cap I get 94 to 98 vdc varying, neg. meter lead to chassis pos. meter lead to neg. side of cap I get -56vdc. Hope that makes sense.
...Last edited by tinkerer973; 11-19-2014, 04:08 PM.Leave a comment:
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Re: New Members - please post your introductions here
Hello everyone,
Tinkerer973 , new member yesterday, Name is Kevin.
Been an electronics tinkerer for years, CB radios mostly, but little by little I'm trying to broaden my horizens, this happens to be my TV, but if things go well, I might be more apt to look at other units, lord knows there are enough of them out there. Look forward to expanding my knowledge of electronics, and maybe even helping someone else out some time, who knows.
KevinLeave a comment:
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Vizio VO47LF 0500-0407-0680 PS board
OK, Here we go. I have a Vizio VO47LFHDTV30A, it went pop and won't turn on. I know PS boards ar common issues with these. I see no bad caps, fuse is good, I have ac power all across the primary side of the board, but once I get to the transformers, I have nothing on the other side.I have some troubleshooting skills, I do radio work once in a while, so I know the basics, but I'm not sure where to start here. I've read a little bit, I have no 5VSB a the output to the main board, thats where I figured I should start. Any help is greatly appreciated.
Tinkerer973 -
Re: Vizio VO47LFHDTV30A Dead Set
It would seem I have a similar problem with this PS board. I have voltage all across the board till I get to the secondary section, then I have nothing. I'm unsure of whether I just lost the 5v stby and the rest is fine, or if there are larger scale issues. I'm not sure where to begin from there. I have some electronics knowledge, I repair radio gear form time to time, but this is beyond what I'm used to working with. Hopefully someone can give me a hand getting this set fixed, ThanksLeave a comment:
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