Vizio e470va No Picture

[at1105]

Re: Vizio e470va No Picture

which fuse on what board? Just trying to keep things straight. To test the fuse, put the negative lead to chassis ground and the positive lead on each side of the fuse. DMM in DC setting.

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.

[at1105]

Re: Vizio e470va No Picture

RECAP of Measurements:

Power Board

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

Inverter Board
Backlight On: Yes
Fuse: ~Good~ measured 24v
In from Power Board: 24v=Yes, On/Off=Yes

Main Board
In from Power Board: 24v=Yes, 12v=Yes, 5v=Yes, PS-ON= Yes
Out to T-Con: 5v=yes
Volt Regs Outputs:

U103 - (G9084) = 5.02v,
U608 - (17809 0501) = 5.07v,
U704 - (M171 1117-18) = 3.28v,
U706 -(M189 1117-33) = 1.77v

T-CON

In from Main Board: 5v = yes
Fuse: Good 5v on each side.

[CapLeaker]

Re: Vizio e470va No Picture

O.k. So power supply and the inverter board are good.

What are the voltages on all 3 pins on U103, U608, U704 and U706 on the main board?
Then there could be a bad eeprom or some other wired fault that requires replacing the main board.

[at1105]

Re: Vizio e470va No Picture

O.k. So power supply and the inverter board are good.

What are the voltages on all 3 pins on U103, U608, U704 and U706 on the main board?

These are the reading I got...


U103
Pin 1 = 5.08v
Pin 2 = 5.08v
Pin 3 = 4.68v

U608
Pin 1 = 4.68v
Pin 2 = 0v
Pin 3 = 5.08v

U704
Pin 1 = 5.08v
Pin 2 = 3.29v
Pin 3 = 1.77v

U706
Pin 1 = 5.08v
Pin 2 = 1.77v
Pin 4 = 0v

[budm]

Re: Vizio e470va No Picture

These are the reading I got...


U103
Pin 1 = 5.08v
Pin 2 = 5.08v
Pin 3 = 4.68v

U608
Pin 1 = 4.68v
Pin 2 = 0v
Pin 3 = 5.08v

U704
Pin 1 = 5.08v
Pin 2 = 3.29v
Pin 3 = 1.77v

U706
Pin 1 = 5.08v
Pin 2 = 1.77v
Pin 4 = 0v

Also from post 42
U103 - (G9084) = 5.02v,
U608 - (17809 0501) = 5.07v,
U704 - (M171 1117-18) = 3.28v,
U706 -(M189 1117-33) = 1.77v

The readings are invalid.

[at1105]

Re: Vizio e470va No Picture

Also from post 42
U103 - (G9084) = 5.02v,
U608 - (17809 0501) = 5.07v,
U704 - (M171 1117-18) = 3.28v,
U706 -(M189 1117-33) = 1.77v

The readings are invalid.

I must be grounding my lead wrong. What is the proper ground point for the neg lead when reading the volt regs?

[at1105]

Re: Vizio e470va No Picture

Also from post 42
U103 - (G9084) = 5.02v,
U608 - (17809 0501) = 5.07v,
U704 - (M171 1117-18) = 3.28v,
U706 -(M189 1117-33) = 1.77v

The readings are invalid.

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

[at1105]

Re: Vizio e470va No Picture

What would cause U103 and U608 to not have any voltage?

[jeffer76]

Re: Vizio e470va No Picture

Check for open fuse on main board. (F701)5amp