Vizio E390VL no 12V

[culcuhain]

Good afternoon!
I present to you today's patient. An older Vizio E390VL my neighbor gave me since it was dead.

Symptoms:
1. Plug in. No standy lights or Vizio lights up.
2. I have 5.2V on the 5.2V line between PSU and main. (5.18V Pins 1-3)
3. I do NOT have 12V on 12V line between PSU and main. (0.00V Pins 8-10)
4. 0.00V on Pins 11-14
5. When jumpering Pin (5.2V stby to Pin 12) 12V lines still show 0.00V
6. Pressing Power button does not change the voltages and doesn't seem to turn on.

Since Main board is receiving the 5.2V and not returning any other voltages i assume the Main board is dead. Thoughts? Next test?
Pics attached.

Cheers and beers!

[budm]

Re: Vizio E390VL no 12V

You should put down the pin number and follow by the pin name for each pin to make it easier for us the see what is going on.
https://www.badcaps.net/forum/attach...7&d=1529176264
1) Pin 12 is BL-ON pin not PS-ON pin.
2) Pin 11 Remote on/off is the PS-ON pin
3) To force on the power supply board, you MUST remove the connector that goes to the main board first otherwise you will damage the main board when you directly connect power supply pin to the control pin without using the resistor.
4) ALWAYS use the resistor, 1K is typical, to do the force on incase you make the wrong connection.

[nomoresonys]

Re: Vizio E390VL no 12V

There you go, do pin 11 and 5v stby with the resistor, see if those volts come back, I know it's the same thing that bud just said but so many people lately have just been skipping on to other things without doing these tests.

[culcuhain]

Re: Vizio E390VL no 12V

Ok here we go. Brain cramp on the 5V to BL/ON. Long day Already.
Jumpering Pin 1 to Pin 11 (5V stby to Power On) I get the proper 12V lines.
Next up, jumper pin 2 to Pin 12 (5V stby to BL/ON) backlights come on.

Bad main board, right?
Been a few months since I last fixed a tv and now have like 16 to do. :S

Cheers and Beers

[budm]

Re: Vizio E390VL no 12V

Status pin is 0 V?
There is EEPROM, see if the problem matches the bad EEPROM PROBLEM.
http://www.shopjimmy.com/catalogsear...q=Vizio+E390VL

[culcuhain]

Re: Vizio E390VL no 12V

Status pin is 0 V?
There is EEPROM, see if the problem matches the bad EEPROM PROBLEM.
http://www.shopjimmy.com/catalogsear...q=Vizio+E390VL

Correct. Pins 11-14 have 0V until I jumper the power on to standby. Will look at eeprom issue

[culcuhain]

Re: Vizio E390VL no 12V

EEPROM is ordered. Will update after I receive and install it.

[culcuhain]

Re: Vizio E390VL no 12V

No change with the new EEPROM.... Time to find a board. :S

[culcuhain]

Re: Vizio E390VL no 12V

Found one. Part Ordered. Will update after it arrives. I will desolder this EEPROM and save it and the original for later. Cheers and Beers

[culcuhain]

Re: Vizio E390VL no 12V

Dead Main Board. Used board and I have the tv up and running.

[petehall347]

Re: Vizio E390VL no 12V

i always like a happy ending

[petehall347]

Re: Vizio E390VL no 12V

for fun check old board for shorts ..one example is audio chip .. but not thinking its that ..

[culcuhain]

Re: Vizio E390VL no 12V

for fun check old board for shorts ..one example is audio chip .. but not thinking its that ..

Not a bad idea....

[zwazovole]

Re: Vizio E390VL no 12V

Good afternoon!
I present to you today's patient. An older Vizio E390VL my neighbor gave me since it was dead.

Symptoms:
1. Plug in. No standy lights or Vizio lights up.
2. I have 5.2V on the 5.2V line between PSU and main. (5.18V Pins 1-3)
3. I do NOT have 12V on 12V line between PSU and main. (0.00V Pins 8-10)
4. 0.00V on Pins 11-14
5. When jumpering Pin (5.2V stby to Pin 12) 12V lines still show 0.00V
6. Pressing Power button does not change the voltages and doesn't seem to turn on.

Since Main board is receiving the 5.2V and not returning any other voltages i assume the Main board is dead. Thoughts? Next test?
Pics attached.

Cheers and beers!

Here is something that may help others - see attached

[zwazovole]

Re: Vizio E390VL no 12V

Here is something that may help others - see attached

After reviewing my own notes, I made some changes to clarify and corrected a couple of errors on steps 8 and 9.

The revision is attached.

Good Luck.