Vizio SV422XVT - constant orange light

[TVGuy45]

Hello all, ive read what I could about this tv and have ran into a wall.

Plug it in orange vizio light comes on

press power button nothing happens - stays constant orange - no blinking white or anything.

Ive checked the 3 fuses on the green main control board (where power button is soldered and all the inputs/outputs) they are not blown. Top one has zero volts to it, bottom 2 have 5.013V on them.

I am missing my +12v

Ive read the thing about checking the voltage regulators and watched youtube videos but theirs blinks white and appears they have their +12.

Where to from here? No blown or buldged rubycon caps over on the power board...

Pics below

[Andrew F. Ali]

Re: Vizio SV422XVT - constant orange light

Unplug All the cable jacks from PSU to Main Bd. Connect a 1Kohm resistor from Any of the 5Vst-by pins to the PS-ON pin...Plug PSU to AC and measure the voltage on the pin 12V is expected on the PSU. If that works then leaving the 1st resistor in place, take another 1Kohm resistor and connect it across the 5Vst-by pin to the INV-ON and measure the 24V pin. If you have the 24V you can plug in the backlights and see them turn ON. If all this works then you have Main Bd issue.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Thank you! I will try it as soon as I can.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Alright tried it- aligator clip from +5 to 1K resistor, other side of 1k resistor to ps-on with zero volts measured at +12.

So its isolated to the power board then...

[budm]

Re: Vizio SV422XVT - constant orange light

Is this the board you have?
Vizio 0500-0407-0910 Power Supply / Backlight Inverter for SV422XVT
http://www.shopjimmy.com/vizio-0500-...t-inverter.htm

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Yup that be it, looks the same and p/n tag matches (0500-0407-0910)

By linking a place to buy are you suggesting to just buy a new board? :P

Is the 1Kohm resistor test above a proven way to see if the power board died for sure? Dont wanna waste money.

[budm]

Re: Vizio SV422XVT - constant orange light

Forcing on the power supply board using the resistor and the cable going to the main board is disconnected and still no switched 12V/18V, then yes the power supply is not working.

[budm]

Re: Vizio SV422XVT - constant orange light

One thing though, if you have all the cable back in place, do you see >2VDC on the PS-ON pin when TV is turned on, if not then you may have more then on problem.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Its at work so I will have to verify the > 2v in the AM.

I assume that voltage that is greater than 2 is generated by the 5V that I know works? Then that signal back is what tells the 12V to kick on correct?

[budm]

Re: Vizio SV422XVT - constant orange light

Please read my basic troubleshooting guide.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Alright so tested for > 2v on PS-ON with everything hooked back up with no voltage on it...

Plugged everything back into the psu, pluged the 120v in, put meter probes on ground screw and PS-ON pin and pressed power button - no voltage. I still have my +5 on all 5 pins, no +12, and no >2 or any voltage on PS-ON...

[budm]

Re: Vizio SV422XVT - constant orange light

Well, you have something wrong on the main board or something is locking out the main board from sending the PS-ON signal.
I would check all the fuses on the main board, check the dcv of all 3 pins of all the regulator ICs on the main board.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Ive checked the 3 fuses, none are blown 2 have 5V on them and one has none (supposed to be 12v) Ill check the regulators but I thought I had to have 12v signal to check those?

Ill check them and report back what I find regardless.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Alright measured and using the pic below here is what I got:

A:
IN: .004 VDC
OUT: .454 VDC
ADJ: .283 VDC


B:
.079
.000
.000

C:
.004
.016
.008

D:
.000
.056
.035

I would assume some of those should have the +5V on the input correct? Even when the orange light is solid? (which I am assuming is standby mode) Pressing the power button while measuring did nothing. All measurements taken using a Fluke 233.

[dick_barton]

Re: Vizio SV422XVT - constant orange light

You have two white ceramic fuses at 11:00 O' Clock from A. Have you checked them for continuity?

[budm]

Re: Vizio SV422XVT - constant orange light

I expect at least one of them will have 5VDC at the input pin.
You indicated having 5V on two fuses, so 5VDC is shown on BOTH ends of those two fuses?

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

I expect at least one of them will have 5VDC at the input pin.
You indicated having 5V on two fuses, so 5VDC is shown on BOTH ends of those two fuses?

Correct, there are 3 little white 5A fuses in the upper left corner, top one shows no voltage on either side,
2nd down shows 5.135 on both sides
3rd down shows 5.135 on both sides.

I did find 3 more tiny fuses with letters printed on them:
F6: K has .004VDC on both sides
F12: K has 5.132 on both sides
F11: G has 3.346 on both sides

That F6 reading corresponds to letter A voltage regulator voltage input...

I may take the board out again and investigate the backside for anymore tiny fuses...maybe do the same on the PSU board as I know theres a buncha SMD components on the backside of that too...

Powered off on ohms shows they are all good fuses with .002ohms across them.

[TVGuy45]

Re: Vizio SV422XVT - constant orange light

Took the green control board out and found no more fuses on the backside...

Also took the tan PSU board off and saw no more fuses on it..

Also studying the control board and backtracing the input tab, I see there are large clumps of tracing separated by these little greenish grey rectangular cubes labeled L(xx) where XX is any number between 4-98+. ohm meter shows they are all .02-.01 ohms across them.

[Diah]

Re: Vizio SV422XVT - constant orange light

You have two white ceramic fuses at 11:00 O' Clock from A. Have you checked them for continuity?

hi Paul, i liked this comments. make me remember action Movie to track one suspect ..

wish its solved soon.

[dick_barton]

Re: Vizio SV422XVT - constant orange light

hi Paul, i liked this comments. make me remember action Movie to track one suspect ..

wish its solved soon.