Vizio VA26LHDTV10T -INTERMITTENT PICTURE

[selkov]

I bought this back in 09. Never had issues until now. Sometimes when you power on the unit it works fine, sometimes it will take 1.5-2 min to power on, and then sometimes the sound comes on with no picture.

Whatever scenario is active it will continue for 1-2 days then changes. That is to say for 2-3 days it will work fine, and then will either not give the picture or it may not power up quickly. I can power cycle the unit repeatedly to no avail. The best thing is to leave it alone for a day or two and then see what happens.

I would like to fix it. But I have not the experience. I have the tools and ability so if anyone would be willing to mentor me on how to diagnose it and where to start that would be wonderful.

-eds

[tom66]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

The first and most helpful thing to do is to take the cover off and get pictures of the layout and of each board, clear and in focus.
Then we can help you locate any potential faults e.g. bad caps, or places to test.

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Thank you for the quick response.
I will do so tonight.

However i have a question... in reading thru the vast number of posts on this unit. Is it accurate to say that this is most likely the inverter? Just wondering if 80% of the issues are the board maybe it is better to just change it = or check the NON inverter issues first?

-Eds

[tom66]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

If you have no sound during the fault, even if only half the time the sound is missing, then it is unlikely to be the inverter at fault, as it only makes the backlight glow.

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Here are the pictures.
Please advice if any need to be retaken.
Thanks.

[JonathanAnon]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

I bought this back in 09. Never had issues until now. Sometimes when you power on the unit it works fine, sometimes it will take 1.5-2 min to power on, and then sometimes the sound comes on with no picture.

In this scenario can you see anything on the screen at all? If the inverter board is working you should see backlight, if the inverter board is not working you may be able to see the unlit picture on the screen if you look closely with a torch...

Either way you need to focus on the PSU, it is most likely that at least one of the voltage supplies is not functioning properly. And this is most likely to be due to capacitor fatigue.



I've marked the secondary side electrolytic capacitors. Normally the first step would be to check these.. What tools do you have to test with, if any?

Given that it does power up after a few minutes, might be worth getting a hairdryer and putting it over these capacitors one by one (when the TV is slow to start up), to see if a bit of heat kicks one of the caps in to action. PLEASE MAKE SURE TO SET IT UP SAFELY IF YOU PLAN ON TRYING THIS.

[budm]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

@JonathanAnon, off topic, what do you use to put those numbers on your pictures?

[JonathanAnon]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

@JonathanAnon, off topic, what do you use to put those numbers on your pictures?

Hi bud, I do a bit of graphic design for websites and the like, so I have a copy of Adobe Photoshop Elements 10 (this is the much cheaper version of Adobe Photshop Full, cost me about 100 euro). I use the text tool to create the numbers, and put a "stroke" effect of 3 pixels on them to give the black perimeter.

[budm]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Thanks, Jonathan.

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

The screen starts out Black, then turns blue. Sometimes it is solid and sometimes it seems to be a gradient or lined in shades of blue. Also sometimes i see a faint outline of a letter box screen inside it.

When you say torch I assume you mean a flashlight. How am i to apply it to test the screen?


I have all the needed manual tools and soldering equipment.
I have available to me a Klein test Meter #Cl200.

http://www.kleintools.com/catalog/cl...ature-0http://

I have a hair dryer and a Heat gun. Which is better?

Before I start messing with the caps, could I test the PSU voltage to be sure it is wrong? If so at what points and what voltage am i looking for?

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

How shall I test the caps?

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

I used the hair dryer and hovered closely over each cap for a min or so. No change.

What is my next step please?

[tom66]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Move on to the main board.

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

I did all the caps I could find and nothing happened.
However if I unplug the unit over night it works in the morning.
Then when it shuts down it does not come on again

[tom66]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Do you mean capacitors on the main board? Personally I would be focusing on the larger processors -- the "chips" -- as they are more likely to cause this issue.

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Yes, I was working with the caps. I am unknowable on how to proceed and am following the suggestions within this thread.

What shall I do now?

[tom66]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Ah, bummer -- Just noticed most stuff is under this shielding can.
https://www.badcaps.net/forum/attach...6&d=1368569640

Perhaps any way to easily remove that (does it have press-down tabs that you could pull up?)

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Are you referring to what lies under the metal plate?
Ill Check.
If I can get it open what shall I do?

[tom66]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

If you can remove it, focus the heat on the components inside it.

[selkov]

Re: Vizio VA26LHDTV10T -INTERMITTENT PICTURE

Will do and advice.