Most of the time it will be blown capacitors in the power supply. Symptoms include not turning on or turning on and then off after a few seconds. This is also the same for LCD TVs. The cost to replace these caps is a few pence or if you are like me you just look through your component scrap bin, then the only cost is 5 minutes of your time.

I had the same problem with my 32" LG TV. It cost me less than £5 to get replacement capacitors from Maplin.

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