Re: Vizio E470VA - Backlight On But No Picture
Didn't receive anymore responses after posting the latest measurements. I figured it had been pushed so far down the list by newer threads that it was probably getting hard to find resulting in no responses. Was hoping to keep it fresh because it seems we're close to finding the problem....
at1105
Member
Last Activity: 09-09-2016, 07:24 PM
Joined: 02-12-2015
Location: TN
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Vizio E470VA - Backlight On But No Picture
Backlight works but no picture.
Below is a list of all the readings I have taken...
[B][U]Power Board [/U][/B]
Out to Inverter: 24v=Yes, On/Off=Yes
Out to Main Board: 24v=Yes, 12v=Yes, 5v=Yes, PS-ON= Yes
Large Filter Caps= ~Good~ reading was >360Vdc
[B][U]Inverter Board[/U][/B]
Backlight On: Yes
Fuse: ~Good~ measured 24v
In from Power Board: 24v=Yes, On/Off=Yes
[B][U]Main Board[/U][/B]
In from Power Board: 24v=Yes, 12v=Yes, 5v=Yes, PS-ON= Yes
Out to T-Con: 5v=yes
Voltage... -
Re: Vizio e470va No Picture
What would cause U103 and U608 to not have any voltage?Leave a comment:
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Re: Vizio e470va No Picture
I was grounding at the wrong location. Sorry for being an idiot. I'm still learning. Here's what I got...
U103
Output tab = 0v
Pin 1 = 0v
Pin 2 = 0v
Pin 3 = 0v
U608
Output tab = 0v
Pin 1 = 0v
Pin 2 = 0v
Pin 3 = 0v
U704
Output tab = 1.80v
Pin 1 = 0v
Pin 2 = 1.8v
Pin 3 = 3.32v
U706
Output tab = 3.32v
Pin 1 = 0v
Pin 2 = 3.32v
Pin 4 = 5.12v...Last edited by at1105; 02-18-2015, 10:44 AM.Leave a comment:
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Re: Vizio e470va No Picture
I must be grounding my lead wrong. What is the proper ground point for the neg lead when reading the volt regs?...Leave a comment:
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Re: Vizio e470va No Picture
These are the reading I got...
[B][U]U103[/U][/B]
Pin 1 = 5.08v
Pin 2 = 5.08v
Pin 3 = 4.68v
[B][U]U608[/U][/B]
Pin 1 = 4.68v
Pin 2 = 0v
Pin 3 = 5.08v
[B][U]U704[/U][/B]
Pin 1 = 5.08v
Pin 2 = 3.29v
Pin 3 = 1.77v
[B][U]U706[/U][/B]
Pin 1 = 5.08v
Pin 2 = 1.77v
Pin 4 = 0vRe: Vizio e470va No Picture
These are the reading I got...
...Leave a comment:
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Re: Vizio e470va No Picture
RECAP of Measurements:
[B][U]Power Board
[/U][/B]
Out to Inverter: 24v=Yes, On/Off=Yes
Out to Main Board: 24v=Yes, 12v=Yes, 5v=Yes, PS-ON= Yes
Large Filter Caps= ~Good~ reading was >360Vdc
[B][U]Inverter Board[/U][/B]
Backlight On: Yes
Fuse: ~Good~ measured 24v
In from Power Board: 24v=Yes, On/Off=Yes
[B][U]Main Board[/U][/B]
In from Power Board: 24v=Yes, 12v=Yes, 5v=Yes, PS-ON= Yes
Out to T-Con: 5v=yes
Volt Regs Outputs:
...Leave a comment:
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Re: Vizio e470va No Picture
The fuse on the inverter board. Sorry I was checking it incorrectly. I assumed you could check it across the fuse at each end but I was wrong. Yes, it has 24v....Leave a comment:
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Re: Vizio e470va No Picture
Apparently my meter skills are lacking severly in this dept. I was checking it with the positive lead on one side and the neg on the other. I'm assuming that was incorrect as I put the negative lead on the ground wire coming in on the inverter board and the positive at the fuse and got 24v on both sides. is that correct?...Leave a comment:
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Re: Vizio e470va No Picture
Apparently my meter skills are lacking severly in this dept. I was checking it with the positive lead on one side and the neg on the other. I'm assuming that was incorrect as I put the negative lead on the ground wire coming in on the inverter board and the positive at the fuse and got 24v on both sides. is that correct?...Last edited by at1105; 02-17-2015, 10:57 AM.Leave a comment:
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Re: Vizio e470va No Picture
Yes. Backlight works perfect. Just not getting a display....Leave a comment:
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Re: Vizio e470va No Picture
no voltage on the fuse...Leave a comment:
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Re: Vizio e470va No Picture
[attach]105911[/attach]...Leave a comment:
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Re: Vizio e470va No Picture
23.9v at the connector on the inverter board and 12.10v/23.9v at the connector on the main board....Leave a comment:
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Re: Vizio e470va No Picture
Both large caps on the middle of the power board are reading 389v....Leave a comment:
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Re: Vizio e470va No Picture
Before powered on, the voltage is 0v at the ON/OFF pin going to the inverter board (with the blue LED). When I power it on the voltage jumps to 5.03 and remains there. There's also a PS/On pin on the other side of the power board going out to the main board. It shows a consistent 4.78v.
[ATTACH]105903[/ATTACH]
[ATTACH]105904[/ATTACH]Re: Vizio e470va No Picture
Before powered on, the voltage is 0v at the ON/OFF pin going to the inverter board (with the blue LED)....Leave a comment:
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Re: Vizio e470va No Picture
I noticed that the VIZIO logo in the front does not glow amber when plugged in. It only glows white when I push the power button on the side. I'm assuming that means that there is no standby power? Would this be an indication of no PSON signal? If not, what is the best way to test if the main board is sending the PSON signal?...Leave a comment:
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Re: Vizio e470va No Picture
According to the datasheet G9084 is adjustable with voltages of 1.5V,
1.8V, 2.5V, 3.3V and 5.0V.
This is what i'm getting...
Pin 1 is ADJ/GND 0.00
Pin 2 is V out = 0.00
Pin 3 is V In = 0.39 v...Leave a comment:
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Re: Vizio e470va No Picture
According to the datasheet G9084 is adjustable with voltages of 1.5V,
1.8V, 2.5V, 3.3V and 5.0V.
This is what i'm getting...
Pin 1 is ADJ/GND 0.00
Pin 2 is V out = 0.00
Pin 3 is V In = 0.39 v...Leave a comment:
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Re: Vizio e470va No Picture
Checked the voltages on the 2 volt regs on the main board. both were only outputting 0.39v?
[ATTACH]105607[/ATTACH]...Leave a comment:
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