Olevia LCD tv 232t12 will not power on. Tried the main power button in rear didn't work.

SOURCE: Olevia LT42HVi - Need to toggle power switch on back of TV off/on all the time

You swapped the power strip. How about swapping the cord with another. Most LCD and Plasma TV used a cord similar to the cord use for the power supply of PC (IEC line plug). If still it doesn't work. Time to open the back to access the connector terminal which came loose (Due to heat) if not soldered directly to the power supply PCB. Just pinch the spade crimp, better still solder it. Make sure to lay the TV flat, face down on a smooth surface table if you're repairing it yourself.
Good Luck.

SOURCE: my olevia LT23HVX does not power on

If you want to see photos and a description of the disassembly process and commentary on my repair job, soldering in the new caps, etc. I've posted them online for anyone interested in tackling the job themselves. I've never cracked the case on a TV before, but thanks to some of the hints here, and some efficient Googling, I was able to fix my own set with a screwdriver, pliers and a cheap soldering iron, all for less than the price of a pizza.
http://www.flickr.com/photos/geegee123/sets/72157607269121264/

SOURCE: Power on problem for My Syntax Olevia LCD TV 23"

I have a 24" Olevia LCD TV. Same symptoms (Stdby LED is on, press power and it flashes off, then back on). The USB cable to the Service Port also worked. But being of sound technical mind, I figured this means that the PC is supplying the +5v to the circuit. What I did was disassebled the TV, carefully disconnected all the cables, and opened it up to reveal the circuitry. I looked over the circuit and noticed the 1000uf/16v capacitor at position CS21 was failed and bulging. I removed the cap, tested it and verified that it was indeed failed. I went to a local Radio Shack and picked up a 1000uf/35v electrolytic, after all, the value is what mainly matters as long as it's not lower voltage than the original. I replaced the new CS21 capacitor back in the circuit (it is polarity sensitive, so pay attention to what the original mounting position is). I reassembled the TV and Viola! Works! No need for the USB cable to the Service Port!

I hope this helps someone!

-Matt

SOURCE: Olevia LT26HV LCD TV won't turn on

Olevia has problems with the power supplies. Best solution is to remove the back of the TV. On the 542 it is about twenty number 1 phillips head screws. locate the power supply connectors check the board for the voltages, clearly marked on the PCB. Continue to check the voltages by powering on the Television. all voltages should be within its described range. If a voltage is low or nonexistent, the power supply is bad, usually a bad capacitor.
There are three series of caps, on the low voltage side it is 16 volt, next 24 volt and finally 36 volt (these are just max ratings.
which ever power that was found low the cap would be near that voltage output connector.
next step is to remove the board and replace the capacitor, using a soldering iron and making sure to solder with no slop.
with the board on an insulated (nonconductive surface connect the board to the televion. Check voltages and if no other voltage issues reassemble.

SOURCE: Olevia LT23 23in. LCD/TV

I had the same prob, but found out that the problem with the Olevia lcd tv's on most models not powering up is because of failure of capacitors on the power supply board that I do believe is due to excessive heat and lack of ventilation.

I took the tv apart and got access to the main board and just by looking at the capacitors I could tell which one were the bad ones..

I will show some pics that I borrowed during my repair, hope it helps as reference as it did to me.





I replaced the bad caps with new ones that I bought at a computer parts store.

Now I got my lcd tv back ON but this time I added a internal cooling fan for better air flow that will reduce this malfunction from happening again.

Hope this helps.