42inch lcd tv.three years old will play so long then turn its self off.the blue lights behind power buttons will stay on but tv will not come back on for around 20 minutes

The main board fault. Contact the authorized service centre for Olevia.
Gopakumar Gopalan Google

The main board would be susoect next if the power supply has already been replaced.

My Samsung started doing that and it got worst and worst. Searched the web and find answer. It was the high voltage circuit. All TVs now are like computer and it check for 390 to 400 volts and if it is below, the TV will not turn on. Good thing the Samsung has only one capacitor showing the high voltage circuit. Measure the voltage was 381 volts. The capacitor was rated at 100 uf at 450 volts. From some old TV and power supply, got two capacitors rated 150 uf and 220 uf both at 400 volts. Had to connect them in parallel and took out the old capacitor. Now, my TV works fine.

Google Dell W2600 blink codes. You're tv is doing a self diagnostic and letting you know what's wrong with by flashing the yellow light. Count how many time and if there is a sequence to it, then look it up.

Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.

I repair these power supplies. Write to [email protected]

please check the ac plug at the wall and also behind the tv. most newer tv's have a cord like a computer that plugs in the back and they sometimes come loose. are the rest of your electronic components working ? if the ac cord is plugged in, your power supply inside the tv has gone bad. you cannot blame your 2 year old if this power supply has gone bad, this was "NOT" caused by playing with the remote control.

Sound like an error code 14 (Audio supply) is beeing blinked...
You probably would want a qualified technician to take a look at it.

If your LCD is less then a year old, I would suggest to contact the manufacturers to have it fix under warranty.
The failure on your LCD could be a defective back light inverter or a power supply not providing enough power to the back light inverter board.
Let me know if you require further assistance.

It sounds like it's the inverter panel which lites the lcd back light.
If it's under warranty, try to replace it, or take it in for svc.