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Menu , sound settings, disable all special effects , Dolby surround, stereo, etc.. unplug, Wait overnight plug back in see if the problem continues if so, check sound settings they should be the way you left them
Is this blue screen on all inputs (HDMI, etc.), or just on the one?
Does the remote control work, can you get the menu to display, is there any sound?
If no sound and picture, no menu etc., might be a software problem, the main PCB, or a missing voltage on this board.
If picture is OK, sound should be there. Check the settings to sound first, ie, 'system' 'mute' etc, by entering the sound menu. If an improper system is selected, the sound will be either absent or distorted. If all the other settings are OK, and still there is no sound, you have to check the audio output section circuit, speakers etc?
I hv philips 21RF vardaan TV ,there is sound on AV channel. and the picture is blinking. even some menu setting have changed.. i tried using the service menu but cudnt understand anything. 2 new av channels have come.. av2 and front which were not present before. sound is not coming even on the other channels but picture is fine on them. only on the av1 channel it is blinking., the philips technision had solved this prob once by pressing some code by remote and i don't know the system code
eithor the flyback just craped out or the tube went
try turning up the flyback failing that call a service tech and ask for a quote
quote cose 30-50 bucks
atleast you will know forsurre if it's worth fixing