Help- Vizio VW42L HDTV10A

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Success!
I also found an offending bulged capacitor under the power supply heat sink (470uf 25v).
The tv powers up and works great! I attached a picture for your reference.
Thanks all!

[budm]

Re: Help- Vizio VW42L HDTV10A

If you are not sure how to solder surface mounted device, just take it to the local shop and give them the new part to install instead.

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

OK, then I will replace U33 since that isn't outputting 3.3v.

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

Your #40 post indicates that maybe U9 is bad. Thanks for all your help!!!!

Nope. Your U9 is good. You report pin 2 is 1.5V for U9. The part number tells us that the expected output voltage is 1.5. So your U9 is good.

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Your #40 post indicates that maybe U9 is bad. Thanks for all your help!!!!

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

Being a newbie at this, I can only doubt its bad so Im going to swap it out.

Start with post #31 and re-read everything until your first post.

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Being a newbie at this, I can only doubt its bad so Im going to swap it out.

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

Amc1117
FD7416

and

K1117S15
736

http://www.digikey.com/product-detai...98-1-ND/705738

http://www.digikey.com/product-detai...ICT-ND/1301519

Now my question to you is:

Do you think U9 is still bad?

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Amc1117
FD7416

and

K1117S15
736

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

Know any Digi-Key part numbers for these 4 regulators?

Provide the actual part numbers of your regulators. The part numbers in your pics are not readable.

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

U33 it's bad. Should be 3.3V(where do you have 4V) and it's supplying the U7 and U9 with higher voltage.

This is exactly why I always ask for actual readings.

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Know any Digi-Key part numbers for these 4 regulators?

[tibimakai]

Re: Help- Vizio VW42L HDTV10A

U33 it's bad. Should be 3.3V(where do you have 4V) and it's supplying the U7 and U9 with higher voltage.

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Plugged it in, hit the power button and took the following voltage readings:
U9
Pin1=0
Pin2=1.5 volts
Pin3=4 volts

U7
Pin1=.03 volts
Pin2=1.27 volts
Pin3=4.03 volts

U33
Pin1=2.79 volts
Pin2=4.03 volts
Pin3=5.10 volts

U8
Pin1=2.04 volts
Pin2=3.28 volts
Pin3=5.15 volts

Here's a picture.....

Thank you!

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

I will post a pic and get readings as soon as I get back home from a trip. Thanks! You guys are so helpful!!!!

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

I have a bad U9 on my main board
Can anyone provide Digikey part number for K1117S15 that is on the main board?

1) Post a picture of your U9 so we know what package it is. Follow my sig file exactly for posting a picture.

2) What are your readings for U9?

3) In digikey, click on "in stock" and type in "1117 1.5v regulator" into the search field. Once you have correct package type selected, your choices will narrow down significantly.

[Amuyamula]

Re: Help- Vizio VW42L HDTV10A

Hi all!
I have a bad U9 on my main board
Can anyone provide Digikey part number for K1117S15 that is on the main board?
Thanks!

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

Selldoor also helped someone figure out that U2 was bad

https://www.badcaps.net/forum/showthread.php?t=20801

[XmouseX]

Re: Help- Vizio VW42L HDTV10A

Thank you so much for your help. I will make sure that I check the surrounding capacitors as you suggested and order a new regulator. Thank you for responding back so quickly on my posts

[retiredcaps]

Re: Help- Vizio VW42L HDTV10A

So this means U9 is bad?

Look at your readings in post 33. You measured pin 2 at 1.51V. As PlainBill would have done if he wasn't MIA, he would ask you is this good or bad now that you know how to interpret the part number?

Hint: Reread posts #34 and #40 again slowly.