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Re: lost picture and sound
You likely have a bad lamp. The symptom you describe matches a weak or old lamp. When you first turn on the TV, the lamp is cold and doesn't draw much power. But old lamps usually have clouded reflectors, so the reflector doesn't reflect the light, it converts it into heat. The bulb overheats, draws more current than allowed, the TV "recycles", green light flashing and then the process starts over. Replace the lamp, use and original Sony lamp as the aftermarket lamps are known troublemakers. Please be sure to rate this solution. Thanks!
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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
my samsung tv model number is sp50L7hx it's 6 years old, when I turn it on it's a not really nice picture just nice sound, after 2 hours the picture is off just sound .... after I was switch off TV and switch on again ... the picture is very bad and just for a ten-twenty minutes ... what's is the problem? I'm never change the lump ... or is it a some problem with T-Con decoders board or is it a lump?
Plasma and LCD TV sets are prone to having capacitors in the power supply section fail. This is the most likely cause for the probem you describe. When capacitors fail your will commonly see one or more of the following symptoms.
If green light in front of TV blinks while picture goes off and comes back then its symptom of weak lamp that need to be replaced.
And if green light does not blink in above process then let me know.
When the bottom half of the picture goes out this usually indicates a failure of the lower Y driver module. When this module fails it will often take out the Y sustain module and when that happens the set goes into over current shut down. Both boards will have to be replaced. All of this is assuming you have a Plasma set and not a LCD flat panel.