Entertainment Center: TVs, Stereos, VCRs and DVDs - Problems with bright areas
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Kestas
11-16-01, 01:34 PM
I've got a 27" Sony tv that has problems showing a clear white area. Whenever the subject shown on the screen has a white area next to a surrounding dark area, the white area has grey bands in it. Can this be adjusted out of the picture?
Smokey
11-29-01, 05:06 AM
Good Morning, Kestas:
Sorry for the delay. The webmaster was having brain farts.
The problem you describe is a function of the Automatic Gain Control circuit (AGC) and can be attributed to a bad filter capacitor in the power supply.
Let me explain: Television sets need to operate on DC (direct current) and you plug the set into an AC (alternating current) outlet on the wall. So, the set goes through the throes and agonies of converting AC to DC within the set.
Part of the process is a thing we call a "filter capacitor". It filters out the AC component and usually provides a nice, clean DC voltage to the circuits.
But the capacitors age and die now and then. Thus, you have AC in the area where DC should be. The fix is to replace the bad filter capacitor. Not an expensive fix. And the set should return as good as new.
Smokey ;)
Sorry for the delay. The webmaster was having brain farts.
The problem you describe is a function of the Automatic Gain Control circuit (AGC) and can be attributed to a bad filter capacitor in the power supply.
Let me explain: Television sets need to operate on DC (direct current) and you plug the set into an AC (alternating current) outlet on the wall. So, the set goes through the throes and agonies of converting AC to DC within the set.
Part of the process is a thing we call a "filter capacitor". It filters out the AC component and usually provides a nice, clean DC voltage to the circuits.
But the capacitors age and die now and then. Thus, you have AC in the area where DC should be. The fix is to replace the bad filter capacitor. Not an expensive fix. And the set should return as good as new.
Smokey ;)