Olevia 242-S11. Have to turn tv off and on 6 times before sound stays on. No problem with picture.

software update .

do you have a picture?

Two things, assuming you installed a working power supply and main board, check to make sure the kill switch is in the "On" position. If my memory serves me correctly, this set does have one. Are you sure you have a working outlet? power cord? When you say the set won't turn on , are you referring to the entire set or just the screen?

Likely the main board and most of these sets there are few or no boards available.

hi, i suppose that ther is no picture or sound.
then usully its the power suplly that is broken

this sounds like a mainboard issue , a replacement mainboard will solve this problem

Most likely, bad capacitors in the power supply.

Silly suggestion, but did you hit the "Source" button again a few times?

According to the manual, the "Source" button changes between the following long list of options:
Tuner, Composite, S-Video, Component, HDMI, VGA, and VGA component.
So you'll have to hit it 6 more times to come back to what you were using.

Olevia went out of business in 2008, so their website is defunct. Here is a link to what I believe is your manual on another website.

http://www.retrevo.com/support/Olevia-427V-TVs-manual/id/563ci863/t/2/

I have the Olevia 65 inch LCD TV and cannot find the comcast remote code for my TV! Any help?