Vizio VX42LHDTV10A stuck in standby after going haywire.

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Heres the best I can get. For that matter,it looks as if U8 is the only one that has a trace that leaves the output.Now Im really lost.

[Jasgriff]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Out of curiosity can you see if the top tab of u33 is connected to pin 1 of u7. Use your multimeter to check. Without the tv on

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Pin one the way I listed or the way the datasheet listed?

[budm]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

My calculation came out the same as Jasgriff, 1.28v. I would change out the regulator, but did you Ohm out the Vout pin to ground to see if it has resistance a lot less than 100 Ohms?

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

My calculation came out as Jasgriff, 1.28v. I would change out the regulator, but did you Ohm out the Vout pin to ground to see if i has resistance a lot less than 100 Ohms?

Vout measures 98 ohms to ground

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Out of curiosity can you see if the top tab of u33 is connected to pin 1 of u7. Use your multimeter to check. Without the tv on

280 ohms

[budm]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

That is correct about the same as the total resistance of the two resistors in series.

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

SO were going with replacing U7?

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Want to give me any idea which part to get?Heres what I see.

http://www.mouser.com/Semiconductors...ng%7C0&FS=True

[Jasgriff]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Have you taken a look on ebay?

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

I glanced at ebay,but most listings are fixed voltage regulators

[Jasgriff]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Not sure if this company is any good?

http://parts.americaii.com/part_sear...part&q=AMS1117

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

They want company information .Gah.Im sure mouser or digikey has it,but theres so many form factors.

[Jasgriff]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

If you look on the spec sheet it shows you pictures of the different form factors. This will help you filter through to the one you need.

[budm]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

From your picture, it looks like SOT-223-4.
So either one of these are OK.
http://www.mouser.com/Semiconductors...ng%7c0&FS=True

http://www.mouser.com/ProductDetail/...nqDMTPIJSx0%3d

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Part Ordered!! Actully I got 5 just in case.Will report back when they arrive!

THanks to all that helped!

[budm]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Oh I forget to tell you that Digikey now will ship USPS for $2.50 for small order.

[Jasgriff]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Hope it works out well for you let us know.

[ktulu909]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

That was it everyone.Thank you so much for all of your help.Repairing this TV has been a very rewarding experience as all I have done in the past is simple board replacement stuff before.

My mom thanks you guys very much for your help,as do I.Its a 5 year old 720P vizio,but to my mom its her main source of entertainment.

I had my bass amp in my car crap out on me last week and found a few capacitors buldging,so when I get back to work tomorrow,Ill find the appropriate sub forum and post the pics and thaaaats next.

[aggied]

Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

Thanks for the thread! Insightful for a newb like me