Entertainment Center: TVs, Stereos, VCRs and DVDs - Convergence on Sony Big Screen
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10-17-00, 11:36 AM
I was wondering if anyone could help me with this. I have a 53 inch Sony big screen that has a blue halo effect surrounding the objects on the screen, I have tried to use the convergence to fix this, but with no luck. If anyone has any suggestions I would greatly appreciate it.
Thanks
Thanks
10-18-00, 08:10 AM
Good Morning, Mike O:
This is, as I perceive it, a projection tube television set with a tube for red, green, and blue.
In this instance, you are seeing the blue projection tube in it's death throes. The scenario that happens is that the picture starts to get a darker as the tubes age. The normal response is to turn up the brightness to compensate. At this point the brightness is high enough to cause the aging blue to tube to develop a thing called "secondary emission". The electron beam is not sharply defined and will "splatter".
Can you replace the projection tube? Yes.
Is it cost effective? No. When the technician replaces one tube, it is practical to replace all three. The theory is that if one is bad, the others are not far behind.
Simply put, it is less of a pain in the wallet to just replace the unit. Replacing the tubes costs about the same.
Smokey :(
This is, as I perceive it, a projection tube television set with a tube for red, green, and blue.
In this instance, you are seeing the blue projection tube in it's death throes. The scenario that happens is that the picture starts to get a darker as the tubes age. The normal response is to turn up the brightness to compensate. At this point the brightness is high enough to cause the aging blue to tube to develop a thing called "secondary emission". The electron beam is not sharply defined and will "splatter".
Can you replace the projection tube? Yes.
Is it cost effective? No. When the technician replaces one tube, it is practical to replace all three. The theory is that if one is bad, the others are not far behind.
Simply put, it is less of a pain in the wallet to just replace the unit. Replacing the tubes costs about the same.
Smokey :(