Re: Vizio 32" VO320E Intermittent Issues
I wanted to post the end result of this (long) thread to hopefully help others that may have the same issues. I ended up replacing the main board and everything works just as it is supposed to!
Also, I wanted to post to tell this community 'Thank you'. Thank you especially to BudM and Kenney123, I would not have gotten anywhere without your willingness to teach and coach me along and stay with the thread until the resolution. You guys are doing a wonderful service in helping others, educating people, and also keeping repairable...
bahowe1
Member
Last Activity: 11-16-2014, 08:10 AM
Joined: 10-20-2014
Location: North Carolina
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Re: Vizio 32" VO320E Intermittent Issues
Thanks for describing that process - I had no idea. I would say that I don't have the equipment, nor competencies to trace down to that level. So, I guess you guys are thinking there is the possibility that something happened when I was jumping that regulator that could have brought the screen into question? Because after jumping and before whatever happened, I got to see the screen was good for a good few minutes, blue screen, with the 'no signal' hopping around.
I guess I have a couple questions. Are there people on this forum...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Perfect question Keeney123.Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
This is certainly my first go-round with this sort of thing, and you guys have been amazingly helpful. If you guys are pretty confident that a new main board will fix my problem, I will start looking into one. From the price of new TVs, it doesn't leave me a lot of margin to replace a board and be incorrect. I don't really [I]need[/I] a TV in the first place.
So, are you guys pretty confident a replaced main board will fix me up?
Thank you
BenRe: Vizio 32" VO320E Intermittent Issues
This is certainlyLeave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Hey guys - thanks for hanging in here with me!
I removed the IC U5 tonight. I ohmed out the board and got:
pin 1 = .06
pin 2 = 0
pin 3 = increasing resistance
I am not sure if I did anything with this test, but I also put one probe where the tab was, and one on pin 1 on the IC itself and got .04. Is this telling me that both were bad?
What do I try next?
Thanks again
BenLeave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Ok, I ohmed out U5
Ground to pin 1 = .03
Ground to pin 2 = 0.0
Sanity check, ground to pin 3 = continued to increase.Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
I ohmed out TF1 - still good to go. No resistance.
I went back and made sure of what I 'thought' I saw last night. New facts. When I plug it in, the Vizio starts orange but immediately starts moving to white (without hitting any buttons). I went back to read regulators, they are all giving me the same ON values as initially reported EXCEPT the following ones:
U11
7805CT
RAG930G
.06
0
0
was
12.18
0.01
5.02
U5
L311
G1117
0...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
I'm pretty positive that I did not jumper to the gate pins. I had actually jumped the MOSFET a couple times because I was so excited to see the screen that I then wanted to check sound. Getting no sound, I thought I need to see if it will power on and off. It was on, I jumped it and I just heard stuff sort of shut down.
So, I need F2 and the MOSFET. Should I order those now? If so, are you guys using Digikey? I can't seem to find the parts on there.
Kenney123 - I did not ohm out TF1 after the shutdown, because...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Great news... followed by bad news.
So I ohmed out output U21 to TF1
0.1.
Voltage on all pins 1-8 when OFF
0
Voltage when ON
1 = 12.2
2=12.18
3=12.2
4=12.18
5-8=0
So I jumped it, and viola - PICTURE!!!! Blue screen with the 'No Signal' hopping around. I did my Happy Dance and then thought, 'well, I need to see if I can get it to work by turning the switch off and on'. Jumped it again, and it all shut down. I have no idea what happened, but no backlights,...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
BudM, I did check the voltage on and off, exactly as you told me to, but unfortunately I jumped to conclusions and did not respond with those values. I will check my sheet again tonight and give those values. I am pretty certain that I had zero volts on all those pins when the TV was off, but let me double check. Just to be clear, we are calling pin 'S1' in your pdf file, pin 1. Then go counterclockwise for naming the rest of them?
So to be clear, my actions are:
Check voltage at all pins for U21, off condition...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
If this were a game of 'hot and cold', I'd say we are near fire! When I checked the resistance between the fuse F2 and U21, on the inputs I was getting '0's on the pins that I'll call one and three (the ones that budm's drawing did not show connections to) and 0.58's on the other two pins. When I checked the output pins, they rapidly were increasing in resistance. They would start around less than one and rapidly climb. Not knowing if that was right or not, I turned on the TV and the voltage on all input pins was 12.18v, same as the...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
On that fuse, TF1, I am getting 0.9 ohms. So, I guess it is showing that the fuse is good, but power is not getting to it. Does anyone have any knowledge of the components to check prior to TF1?
Thanks for all your help.
Ben
Now that I think about it, I did see a thread about power not coming out on pin 8 of some component. I can't really remember anymore details and can't find the post again, but wonder if that was a similar issue? Wondering if my scant few details might help ring a bell?Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
I checked voltage at TF1 when the backlights were on and have no voltage on either side of the fuse.
I also checked all connectors as kenney123 suggested and could not get the backlights to go out.Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
VCC on the T-Conn is 0.12. VDD is 0. Both were zero when I would plug it in and the backlights would not come on (even though the Vizio symbol was white). I could only get VCC to read something if the backlights would come on. I can contact ShopJimmy on Monday (looks like hours are only Mon-Fri). Any other ideas? Did that voltage check on the contact pad give any ideas?
Thanks for all your help so far!
BenLeave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
I [I]think[/I] I checked the fuse on the T-CON board and have no power to the board. But, I wasn't sure it was the fuse because it wasn't labelled with a "F" but instead a "C". I took a picture. Can someone verify that the rectangular block right beneath the ribbon cable (sort of left of the middle of the ribbon) be the fuse?
If that was the fuse and I have no power, now what do I check?
I also disconnected the ribbon at both the t-con and the man board connection and reconnected to make sure it was correct...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
I will check the fuse on the T-CON board tonight. Did you happen to see my comment about the U7 regulator not having a 'leg' at the middle pin? When I checked the board at the solder area where the leg would have landed, it seemed to have the same voltage as the tab and also the part of the leg that was still on the regulator. You can see the missing leg in the picture (barely). It's attached above. Does this make a difference?Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Budm - am I missing something? U7 was showing 2.07, so I add the 1.25 and arrive at 3.32, and the middle pin was showing 3.31. Your post calculated 3.57. Could you help me understand?Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Budm - thanks, I will re-check U7. One note that I made while checking this one in particular was that there was no 'leg' from the regulator that went to the board for the middle pin. Is there supposed to be? I understand these regulators are connected internally - the tab and the middle pin, so when I tested the board, it had the same reading as the edge of the regulator where the 'leg' would have protruded from the regulator. You can barely see it in the picture that I attached. Does this leg have to be there if it has the big tab?...Leave a comment:
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Re: Vizio 32" VO320E Intermittent Issues
Images of the two boards have been added... hoping budm can provide me some help?...Leave a comment:
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Vizio 32" VO320E Intermittent Issues
Hello, first, let me say thank you for all the knowledge that I have already gained from all of you. However, after all my searching, I still can't find a similar problem.
I was given a Vizio 32" that did not work. I don't own a TV (yet) and have little (no) experience with LCD's but have messed with electronics for years. I can't figure out what's happening with this one.
When I plug it in and turn it on, sometimes - usually the first time after I plug it in, the backlights will turn on and the logo will turn white. No picture, but I am not sure if there is supposed to be one....
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