Check its speaker first. If it is found OK, check and replace the audio output card. Contact the authorized service center for Philips to buy a genuine card. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts. Check the site in 'Mosaic' view. It will make search easy.
SOURCE: Philips flat screen tv will not power 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] if you require further assistance.
SOURCE: Philips Flat Screen TV has sound but no picture
My Philips 50" Flat screen has sound but no picture. What should I do?
SOURCE: My Philips flat screen tv
It could be a power supply problem. In this model at least 2 capacitors, go bad in the power supply I think they're 1000uf/10V. If you look at the power supply board you will notice a bad cap with a blister on the top. The whole power board is from $100 - $200. I fixed a lot of these sometime the Y or sustain board goes bad. Visual inspection then measuring voltages..
Best of luck
Nour Sabre
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