No video no sound

[shorteddiode]

I have a VW42LHDTV10A Vizio, no picture no sound, no response from the remote or the bottons on the set. Have to unplug to turn off, My back lights are coming on and I get a white screen now that I replaced Two voltage regulators U7 and U33, Both fuses F1 & F2 are good. I am safe in thinking it is just a main board problem or could the inverters be bad. Can't find a service manual for it so I don't know how to test the inverters. Can anyone help??

[selldoor]

Re: No video no sound

Hi you have been a member for some time so should know the drill.

See "Search" above - Type VW42LHDTV10A into the search and read some/all of the previous posts. You will see that pictures are required.
One of the posts at least says there is a schematic on electrotanya.
And this one (another set) https://www.badcaps.net/forum/showthread.php?t=12954 has lots of good ideas.

You can also search for vizio inverter or test inverter and a load of posts will come up which should help you. If not then make a second post advising all the steps you have taken include pictures of your boards and someone might then have enough info about your problem to assist.

I am safe in thinking it is just a main board problem or could the inverters be bad.
A, possibly B, unlikely - The inverters power the back lights so if they are on and remain on then it implies the inverters are ok.

[shorteddiode]

Re: No video no sound

I am so ashamed,,,,, I thought about the search after I posted, and did find lots of good things to read that were helpful. I hope you can someday forgive me