vizio gone bad

[pthomson54]

does anybody know where I can find a full set of prints for a vx42l. I have found plenty of partial service manuals. All are missing about 4 chapters and the index, which is supposed to have the schematics and component list. I even contacted Vizio and got no help. Thanks, Mike T

[selldoor]

Re: vizio gone bad

Hi I have had aquick look and the ones I saw do not have the power supply in
was that what you were wanting? It is often missing. If you were to say what the problem is we may be able to help.

Please change your thread title if you can , to quote the model number.

[cashkennedy]

Re: vizio gone bad

Most vizio models posted are missing the middle chapters which are mostly crap on menus and settings.

But i think elektrotanya.com has the full manuals. I dont think vizio ever includes the power supply drawings in the manuals.

[pthomson54]

Re: vizio gone bad

Thanks for the replies, My problem isn't the power supply,(for a change). I have all the voltages at all of the connectors. It turns on and I get the ccfl's lit, but no video or sound.I've replaced two of the ics and am getting ready to order some questionable components. It sure would be easier with some schematics to go over.

[selldoor]

Re: vizio gone bad

Welcome to the forum-
We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed
https://www.badcaps.net/forum/attach...1&d=1290283049

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

It will be useful if you can say a bit about yourself - skills tools etc.

[Mr Bill]

Re: vizio gone bad

I have all the voltages at all of the connectors. It turns on and I get the ccfl's lit, but no video or sound.

I just fixed this exact model tv on moday. Check U33 on the mainboard. Its a voltage regulator. Verify that you are getting 3.3v output. It should be 5v in and 3.3v out. My set was only putting out 2v and i was getting no video or audio. I've read that this particular part fails in this tv.

[pthomson54]

Re: vizio gone bad

thanks for the input. Something about myself, I've been fiddling around electronics for a lot of years, but since I retired about 6 years ago, did I really get into troubleshooting. I love it! I've got a lot of equipment (albeit mostly older stuff). I've built some meters and power supplies. I can pick up slight differences on circuit boards and components(such as discoloring and heat signatures.) I prefer to work off of schematics, but I don't like to pay for them. I don't have the money. I'm a fix-it man. I can fix just about anything(riding lawnmowers, heat guns and cars) and I enjoy it. My occupation was electrician, but my hobby was always electronics.
Getting back to my problem, I found some funky voltages on U7,U9,and U6 and I destroyed a couple of caps while getting them out of the way. When the parts come in I'll let you know how it turned out. Oh, I did have a blown microfuse on the video board,but didn't find anything else. these boards are the toughest when trying to unsolder components. Thanks again for the help. Also I'm having a terrible time navigating this site. I might need some help with that, as well as my typing.

[tibimakai]

Re: vizio gone bad

just cut the legs off of the regulators and unsolder the tab by adding more solder to it. I didn't remove any capacitors.

[retiredcaps]

Re: vizio gone bad

Vizios, for whatever reason, seem to be plagued with bad voltage regulators on the main/logic board. Either they got a bad batch, underspecified them, went with the lowest cost supplier, and/or there is some other fundamental design problem. No other brand seems to have this many problems with voltage regulators.

[tibimakai]

Re: vizio gone bad

but this is good for us, easy fix=easy money Vizio, keep it up the same way