Vizio E320-A1 will not power on

[ventu]

Good evening, I have purchased a Vizio E320-A1 that didn't turn on at all when tested at store, obtained for $15. I've opened TV, and literally rotated the fuse, now now lower left indicator light illuminates. I set the Voltage meter to 20 DC.
I believe the issue resides on the Main board, specifically the EEPROM, the individual who posted here has my same symptoms, however I may have different Voltage meter reading results. https://www.badcaps.net/forum/showthread.php?t=29539
My first questions are:
- Where is this EEPROM? Under a heat sink?
- Should I be seeing meter reading from the data cable between the main board and the panel? I have an image attached.
- On the Power supply board, I do get readings on the power source to the Panel, however I believe the voltages are higher than my current meter settings
When I get home I will attempt to use a dvd or other device to produce sound or TV, but I suspect that the TV is simply not turning on. When I press the Power button, Capacitors and other electronics change their voltages. But nothing displays on the TV, even with the ‘flashlight' test.

I'm heading down to do further testing, but I wanted to get this thread started. Thank you!

[budm]

Re: Vizio E320-A1 will not power on

First we need to know what DCV you have on the connector of the power supply board that goes to the main board when the TV is off and when the power switch is activated.
The pins are labeled so make sure to give the pin name and follow by the DCV reading for each pin except the GND pins.

[ventu]

Re: Vizio E320-A1 will not power on

Budm, thanks for the reply:

TV Testing:
Power Leads on Power Supply board:
Powered Off but plugged in:
On/Off = .03
DIM = .04
12v = 12.06
12v = 12.07
GND
GND
GND
12V_Audio = 12.01
12V_Audio = 12.05
PS_ON = .10
5.2V = 5.2
5.2V = 5.17
NC = .01
Powered On
On/Off = .06
DIM = .09
12v = 11.84
12v = 11.84
GND
GND
GND
12V_Audio = 11.84
12V_Audio = 11.84
PS_ON = 5.15
5.2V = 5.17
5.2V = 5.17
NC = .01

[budm]

Re: Vizio E320-A1 will not power on

So the main board is not sending the BL-ON (ON-OFF) and the dimming control signals, <1VDC = OFF.
You may want to look here and contact them:
http://www.shopjimmy.com/catalogsear...=Vizio+E320-A1

[ventu]

Re: Vizio E320-A1 will not power on

Thanks for the reply. Now, even though the Voltage readings are showing that. Would there be another electronic telling the 'On indicator light' to illuminate when pressing that On button?

EDIT:
I read over your message again. You're saying the Mainboard isn't sending over the correct Voltage, I got you. So yes, another portion of the main board handles the light indicator, and it sends another signal back to the power supply board telling the panel to light up. I'm assuming?

I've reached out to Shopjimmy.com

[ventu]

Re: Vizio E320-A1 will not power on

Well, shoppjimmy came back stating they are unaware of what part I would need. What do you suggest I test the next?

[ventu]

Re: Vizio E320-A1 will not power on

Good afternoon, any other pointers? I'm just ensuring it's the mainboard which has the issue. I'm getting mixed feedback that this could be the Power Supply board not delivering the amount of Voltage needed, not so much the logical board.

However, personally, I believe the logical board software/firmware isn't telling the panel to power up correctly, hence the EEPROM chip, can someone help me confirm which item to purchase?

[TechGeek]

Re: Vizio E320-A1 will not power on

Could you unplug the backlight inverters? Does that change it?

[ventu]

Re: Vizio E320-A1 will not power on

Would this be the Inverter? Coming from the Power supply Board?

[TechGeek]

Re: Vizio E320-A1 will not power on

Can I get a photo of the rest of the board?

[ventu]

Re: Vizio E320-A1 will not power on

Can I get a photo of the rest of the board?

It's in the first post, but here's a few different ones, I'll upload in a bit.

I did however find the Inverter board (Under the bottom metal piece covering a remainder of circuitry . Ever since then The Power indicator light doesn't come on..feels like i'm going backwards.

EDIT, added photos.

[ventu]

Re: Vizio E320-A1 will not power on

Bump - any further assistance?

[dick_barton]

Re: Vizio E320-A1 will not power on

You can try disconnecting the main board and use a 1K resistor between On/Off on 5V and another 1K resistor between PS_ON and 5V and see if the back lights come on.

Edit.
Even with the back lights off (and the main board connected) can you see the menu if you keep pressing the remote when shining a strong light on the screen?

[ventu]

Re: Vizio E320-A1 will not power on

Happy Thanksgiving everyone,
Thank you Dick for replying. I'll attempt this after the holiday weekend. Also for your flashlight question. The flashlight test doesn't show anything on the screen, I only used my cell phones flashlight however, not a strong light.

[ventu]

Re: Vizio E320-A1 will not power on

Well here's what happened when i did that:

- On/Off - 5.04 V
PS_On - 12.07V

There is no light coming on however. To 'securely' test the Resistors I placed them on the Logical Board end of the cable. I'm making my meeter reading tests on the Power supply board. Where should I test next? I have a feeling if On/Off is now reading, I'm wondering if the Panel is bad..

[dick_barton]

Re: Vizio E320-A1 will not power on

Where did the 12V come from? If ON/OFF is connected via a 1K resistor to 5V and PS_ON connected to 5V using a second 1K resistor then ON/OFF and PS_ON should not read more than the 5V applied.

[ventu]

Re: Vizio E320-A1 will not power on

That is a good question, I'll check again later on today.

[ventu]

Re: Vizio E320-A1 will not power on

So I confirmed I have 5v from Ps_on and on/off. The pin out was different from the other end of the logical cable. What now?

[dick_barton]

Re: Vizio E320-A1 will not power on

Did the back lights come on even if only for a few seconds. If not the only thing I can think of is to add a 3rd 1K resistor between 5V and Dim ( again with the mainboard disconnected) and then check what voltages you have at the led output connector. The voltage may be high when you first switch on then drop rapidly.

[ventu]

Re: Vizio E320-A1 will not power on

Dick,

thanks for the reply back. The back-light didn't come on at all. The Power indicator towards the bottom left doesn't come on either, usually it does. I'll try the 3rd resistor tonight.

Each time i read the Voltage from the LED plug listed in my 9th post of this thread. It gives me just a 1, like I don't have my voltage meter set high enough. I'll check it again once I try the 3rd resistor.

If the light doesn't come on, even with the dim connected would it be safe to assume the PS board is bad?

I also did find out why the little power indicator light didn't come on before. The cable from the buttons weren't fully plugged into the logical board.