Sony KV 20S40 20" tv flutters, reduces in size and then shuts off
I have this tv about 8 years now. Just recently when I turn the set on it might be Ok for a minute or two and then the picture starts fluttering. It appears it's having trouble maintaining the full image. Then it might go black on the right edge of the screen (1 1/2 inches or so) before it shuts off. The standby light will go and off every few seconds. I'd like to know is this a picture tube problem or a power problem and is this worth repairing? If repairable how much might it cost?
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Re: Sony KV 20S40 20" tv flutters, reduces in size and...
The set most probably has cracked solder joints in one of the deflection circuits, which is pretty common. The picture tube and major components are fine. A good tech can quickly resolder the main board and that should not cost too much. If your set came into my shop I would charge about $50 but ask around, the shops in your area will vary.
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the blinking is actually an error code. watch the blinking closely and you will see it blink a number of times pause briefly then blink the same number of blinks over and over. If you let me know the number of blinks I can tell you why the set isnt powering up.
I have seen this flashing before, this could be an indication that the picture tube is weak, what happens is that if the white balance is off there is a circuit called akb it monitors the kathode of each gun and if they are not in balance it will attempt to balance it out. if it can't the picture will begin to flash, sometimes in some models the power light will blink 5 times. On some models the power light will only flash if the tv gives up trying to compinsate for white balance and shuts off compeletely. If you see the tv shutting off with 5 blinks then you know for sure it is time for a new set.
If the screen won't come on then the diagnostic will never show. The 4 blinks is an error code. If the set is older than 12 years then it doesn't owe you anything, you got your money's worth out of it. Average life of any tv from that genre is 8-12 years. It's time for a new set, or take it in for an expensive repair ( pending parts availability).
I would have someone check the electrolytic capacitors in the power supply or deflection circuits. You can check them with an ESR meter. Any good technician should have one. I bet one or two of the caps are leaky.
There are no adjustments for this problem,if the unit has been working good for 3 years and suddenly gives you this pix is time to call a qualified technician,among many reasons you might have loose solder conections in the horizontal drive circuit or poor regulation problem in the power supply,if you dont know how and where be safe and call a Technician.