Originally Posted by scsiraid
Well... if you are seeing this on digital channels (ATSC OTA) then you can eliminate the tuner agc theory (unless OTA ATSC is a secondary issue). The tuner is delivering an mpeg stream which couldnt care less about what the agc does when it comes to black level and white level. Also, if you are seeing it on ATSC OTA then you should also see it on QAM.
What connection scheme are you using to the display? Component? HDMI?
not necessarly true. keep in mind
The ATI Theater 314 demodulator chips handle digital channels, while the Philips/NXT ADC chips handle analog channels. They run in parallel, feeding a ViXS XCode-2115
a dedicated encoding/transcoding chip.
This chip applies digital filitering, sharpness controls, spacial filters, etc.
While I am no expert the problem could lie in the Vipx chips digital filtering/encoding process. Its interesting to note the Vipx chip.
Automatic Gain Control (AGC)
The purpose of AGC is to smooth out the incoming video in case there are fluctuations in
signal strength, brightness, or intensity of an image. When an AGC is implemented properly,
the user should not notice any major changes in brightness when changing channels or when
there is a sudden change in the color on the screen. The Theater 650 Pro employs an
advanced AGC algorithm which provides superior signal control relative to competitive
solutions resulting in clearer more vibrant images, as illustrated in Fig.3 below.http://ati.amd.com/products/theater6...WhitePaper.pdf
see page 10 - 13.
The most frustrating thing for me is to hear the numerous post of "I don't have this problem so it leads me to believe there is a bad batch of chips out there causing this so I keep buying more tivohds in the persuit of finding a bug free one.
But do any of you have a recent 2008 manfuactured Tivo-Hd? I have only been able to get my hands on 804 and 805 serial numbered models?
If its a bad run of chips its no surprise that you guys haven't seen this problem.