Vizio vp422hdtv10a no audio,no video.

[Peter B]

2 relay clicks when a/c cord plugged in,Vizio logo on front panel stays amber/orange.visual inspection ok caps appear ok fuses good,have stand-by voltage of 5.3vDC. PSON is .489vDC,ac detect 5.15vDC,read in a thead that u can apply voltage to PSON(3.0vDC)to turn on power supply.no new voltages ,except 2 sub fuses on power board volts rose from 25vAC to 60vAC.
an the relay clicked on,relay got warm an couple small caps did also.Disconnected all other boards,no effect.help

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

Test according to this video:
https://www.youtube.com/watch?v=cNFzBJELFoU&t=2m50s

(It's a different fault, but Vizio have lots of problems with voltage regulators causing lots of problems.)

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

Thank u for resonding so quickly.i have reveiwed the info that u had sent,did watch that u tube vidieo before. it was similar but that set @ least turned on.
my set dosent turn on @ all. so some of the readings were simalar, or none @ all.Reveiwed the flow chart,some findings lead me to power supply.Before i did anything to the set found w3 micom board on power suooly was flashing twice, power supply legend states that D5v/vg/12V m.i.a.now is steady with
still no voltages.Ugh!!!!!think power suply issues.

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

on my tv U 33 has 8 leggs an not 3. How do u ckeck for power saving mode? Did flow chart testing for monitor display nothing (pc mode).
#1 power board output +5VSB,F4? 5.3VSB F4 5.1V
#2 J1 connector of MB good? yes
#3 Is DC/DC ok?
i skipped #3 ckecked #4 real quick ck U 22 Pin#2 3.0V yes 3.0V
Now # 3 DC-DC ok? went to DC/DC converter flow chart,
#1 voltage is about 5V(5VSB) yes 5.3V
#2 check power board,yep,its still there,
#3 check power cable,F4ok? yes and yes
#4 j1 connection ok? yes
#5 check U 22 pin3 5VSB? yes 5.1V
ckeck pin #2 3.3V? yes 3.3V

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

H e l p...

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

This is a different main board. U33 isn't a regulator on this one.

Can you test all the others?

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

Main board P/N# 0171-2272-2585
V50P FHDTV10a


U-4 pin #1 0.0
#2 0.0
#3 10.4mVdc

U-15 pin #1 35.7mVdc
#2 57.3mVdc
#3 10.5mVdc

U-16 pin #1 1.0mVdc
#2 0.0
#3 0.0

U-17 pin #1 0.0
#2 0.0
#3 10.5mVdc

U-18 pin #! 0.0
#2 0.0
#3 0.0

U-19 pin #1 0.0
#2 0.0
#3 10.5mVdc

U-20 pin #1 0.0
#2 0.0
#3 57.4mVdc

U-21 pin #1 0.0
#2 .7mVdc
#3 0.0

U-22 pin #1 2.0Vdc
#2 3.3Vdc
#3 5.15Vdc

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

The only regulator in use in standby is U22, and it is working fine. (ADJ is 1.25V(±0.05V) less than OUT.)

I see at least three fuses on the main board, white ceramic coloured, gold or silver capped, near the power connectors. With the set unplugged test the resistance across them. On a DMM you should see less than 2 ohms.

Then plug the set in and check the voltage either side. If there is a supply, such as 12V, on one side, but not on the other, then there is a problem with that fuse.

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

There are 4 fuses, F1,F2,F4 are ceramic.

F1-.736Vdc

F2-1.9mVdc

F3-5.15Vdc

all r good.

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

What does VDC indicate in this instance? Also, where is the fourth fuse?

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

Im assuming its a fuse,labled on min board as F3. 11.4mVdc, has a single white "G" on it.

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

Please, what does "11.2mVdc" mean? Across it? From each end to chassis? Can you test them on the ohms range too?

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

11.2mVdc,i thought meant milli volt,so,11.2milli volts dc. the first readings were with a/c cord plugged in chassis ground,unplugged all fuses read 000.1omhs.

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

I understood mVdc. But I'm confused about which end you were testing. Were both ends the same? Any time there is a significant difference, the fuse is open (failed.)

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

its NOT a fuse. missing 5v and 12v.

[selldoor]

Re: Vizio vp422hdtv10a no audio,no video.

I still dont follow this I dont know how Tom saw the fuses on the board this is the worst set of pictures I have seen for some time.
Where is the 4th fuse if it is labelled F3 where is the one labelled F4.
We should have pictures where we can see the board labels next to the component
like in these
https://www.badcaps.net/forum/attach...1&d=1290283049

https://www.badcaps.net/forum/attach...7&d=1280167246

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

I am completely lost. As Selldoor said, we need better pics. That is all we have to work from.

You need to follow this test exactly...

For each F1, F2, F3, F4:
- Measure the voltage on one end.
- Measure the voltage on the other end.
- Report the readings.

If there is a significant difference between the two, suspect the fuse.

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

i have enclosed a picture off the web of ALMOST the same @ shop jimmy,cant get a good picture of mine.(mine m/b also has a reset button,which is not pictured)....ok fuses,
with a/c cord plugged in,ground to chassis F1-.736VDC both sides,
F2-0.0VDC,both sides, F3-0.0VDC,both sides,F4-5.16VDC,both sides.
Also, ckecked both sides sides,of fuses with a/c cord unplugged,meter
set @ omhs with tone all ckeck ok.

[tom66]

Re: Vizio vp422hdtv10a no audio,no video.

OK, all fuses are good.

Is there a pin marked PS-ON on the power supply? What does it report when the TV is in standby and when the power button is pressed?

[Peter B]

Re: Vizio vp422hdtv10a no audio,no video.

tv set doesnt turn on,in stand-by, PSON reads .497VDC,
pressing power button changes nothing.