Help Vizio VW32LHDTV10A no pix no sound no backlight

[Marsman]

I am trying to troubleshoot a VW32LHDTV10A. The orginial complaint is that it would sometimes not power up (VIZIO turns white but no picture no sound no backlight). Since this is an intermittent issue I am having trouble with diagnosis. The first time I tried to turn it on the problem showed up. When I turned it off and back on the unit turned on normally. I let the unit run for about 6 hours before it shut it itself off. Let unit set unplugged for several days before I could examine it. Since that time everytime I plug it in and turn to test it, it works. Checking the voltage regulators I get the following voltages

U2 2.07 3.34 5.13 AMC1117
U7 0 1.28 3.32 AMC1117
U8 2.06 3.33 5.18 AMC1117
U9 0 1.51 3.33 K1117S15
U10 1.38 2.63 5.13 1084
U33 2.05 3.32 5.14 AMC1117
U3 11.96 0 5 7805


Looking at some of the other treads these voltages look in range to me. Also this board is loaded with Taicon lytic caps.

Any thoughts?

[Dgtech]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

I had something similar that made me simply buy a replacement mainboard. The processor on mine was getting too warm.

[Marsman]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

That might explain the shutdown, but I can't find anything on the original problem.

[Dgtech]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

The problems are all included within the mainboard.

Here's some info on a related Vizio.

https://www.badcaps.net/forum/showth...ighlight=vx42l

When researching this problem try to use these different vizio model numbers. They're not all built the same but they all share common failures.

VX42L
VW42L
VO42L
VX32L

[Marsman]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

Sorry the brain didn't connect with the fingers on the last post. An overheating processor wouldn't cause the original problem. I have looked at a lot of the other threads and have checked all of the regulators. Unless I have missed something all of the voltages seem to be in range. I unfortunately do not own an ESR meter so I can't check the caps.

[Dgtech]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

Using the numbers taken from the photo " 0171 2272 2292", I found a replacement mainboard on ebay for $60. There is no shipping cost and theres a seven day return policy. This is a cheap time saving thing to try since you've kinda weeded out the usual stuff.

[Marsman]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

I wonder if I might have a cold solder joint somewhere?

[kb48]

Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

Mine is similar. However how hot is normal for the processor? I think it would get warmer when in use. Mine gets quite warm but all the voltages are still normal.
Mine just has P/S problems, and today I am going to try soldering around on the P/S to see if it will revive the missing 12 and 24 section.
I would love to know what PIN 1 of J1 the PS_ON voltages are when set is in standby and when set is on. When I attempt to strap mine to 3.3 or 5v it only causes the relay to click amd shut down the P/S as it is normally closed, and feeding AC to the main section.

Something is just plain flaked then...