Re: FIXED...Vizio LDO Voltage Reg U7 VW42LHDTV10A
Bud -
You asked me to follow-up on my Vizio 42" regulator (U7) repair:..
A few weeks ago, you helped me identify the correct voltages for my Main-Board Regulators in my VW42LHDTV10A. You posted the links to the Digi-Key Regulators I needed, mainly U7. I ordered them and replaced U7 only...and IT POWERED ON IMMEDIATELY! So, Thank you for your help!
I can not find in this forum where I was posting before, so I followed up here since this thread is about the same problem and solution. ...
Derrick8265
Member
Last Activity: 01-05-2016, 01:14 PM
Joined: 12-16-2015
Location: Colville, WA.
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Thanks again!Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Good! One final thing: what's IC stand for and LDO?Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Good on U9, so thank so much for the links. I'll get these coming and repost if all-good. I appreciate your help!Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Ok, I think I'm seeing this now. The pin I called #2 has the same readings as the "big one" opposite the three smaller ones, which I called #4. So, it must be the output...or they both are.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Sorry, I see what you're saying. I should have said U9 - not U33. You're right.
Is U9 output ok where it is at 1.52v?Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Yes, for U33. But U7 output is .90v...according to the drawing in the PDF listed 2nd via your link. That showed the #2 pin as the output and #3 as the input. Do I understand that correctly?Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Any advice on buying replacements?Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Bud - I'm still not getting you replies to show up until after I post...do you know why that is happening? It's making it hard to follow.
I agree, it looks like U7 is bad. And U33 is outputting at 1.52v. Is that ok for that one? If not, it seems I need to order the repair kit.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Bud - I reviewed the PDF link, but unfortunately do not understand much of it. However, I saw how to numerically identify the pins on these little regulators. So, I hope this will be better for you:
U33:
pin 1 is 2.00v
pin 2 is 3.29v
pin 3 is 5.14v
pin 4 is 3.29v
U7:
pin 1 is 0.02v
pin 2 is 0.90v
pin 3 is 3.29v
pin 4 is 0.90v
U8:
pin 1 is 2.06v
pin 2 is 3.30v
pin 3 is 5.15v
pin 4 is 3.30v
...Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Bud, I'm not getting your reply until I post a new message...I don't know why.
Yes, that's my board, and they're out of stock or I probably would have just replaced it - considering my understanding of this kind of small technical work. But, I'm learning some new areas of repairs, which I like, since I like to repair all I have that I am able to fix.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Correction...I'm being helped by an "ET" - not an "IT". I'm doing the internet searching for the specific info he's needing, like if a schematic exists on this unit. I don't see a manufacture name on the board either. I'm working on figuring out what kind of format you want via your link. Will get back to you when I know more...Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Bud - apparently my posts are a bit out of sync, but thanks for the info about F2 - that makes sense.Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Thank you for your reply budm! I am working with my father-n-law on this repair. I know virtually nothing about this, but he was an IT in the Navy, so he will understand what you're saying and/or asking for. He's out plowing snow right now, but I will get back to you tomorrow with pics and more info. By the way, the board is:
0171 2272 2293
3642 0102 0150
Sorry to say, but I don't know how to post a pic on this forum
Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
PS: I also tested main board fuse F1 and F2. F1 is 5.1v and F2 is nothing. However, F1 and F1 both read 1.2 ohms with power cord out. (?)Leave a comment:
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Re: Vizio 42" LCD VW42LHDTV10A Will Not Turn On
Hello - I'm having similar trouble. TV will simply not power up and turn logo white.
I'm in need of some help finding a schematic for my Vizio model VW42LHDTV10A. I'm not getting the proper voltages at the 13 pin connector at the top of the main board:
pins 2-5 should be 12v, but they are 1) none, and 2-5 are 5.1v. Also, 9-11 should be 5v, but I have no voltage there. So, I replaced the PSU, but no change in symptoms or meter readings.
Symptoms are: orange logo lights up, but will...Leave a comment:
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