Originally Posted by mbuchana
From your posts on other threads, it sounds like you managed to get a DCH box. It sounds like getting a DCH will fix the green line/tear problem on HDMI when set to 1080i with no 4:3 override (which are the settings I had previously used with my 6412).
Right. The DCH box only demonstrates the GREEN LINE failure in the 75.59 software if ALL of the following are true:
1) You use HDMI output. Component output does not show this failure.
2) You use YCC output data format. RGB output does not show this failure.
3) You use 480i output (typically via the 4:3 Override mode). 480p and higher resolutions do not show this problem in the DCH boxes although they DO show it in the DCT boxes when running the 75.59 firmware. (To see the problem on HD channels from the DCT box you need to be using a display that has no overscan since the GREEN LINE is only 8 to 10 pixels wide.)
4) You either display 4:3 content at 4:3 aspect ratio, or you stretch it to 16:9 and your display doesn't nave overscan. The GREEN LINE is only about 8 to 10 pixels wide so it won't show if you stretch 4:3 content to 16:9 on a display with overscan.
Forcing a new HDMI handshake via your Receiver will eliminate the HDMI 480i YCC GREEN LINE temporarily, but as soon as you enter a new SD channel number and the Info box appears on screen, so will the GREEN LINE.
Separate from the GREEN LINE problem is the unreliable HDMI handshake whenever you change the output resolution. In the DCH and DCT boxes (running 75.59 software) this happens regardless of which resolutions are used. The symptom is an infinite loop of HDMI handshake retries. In my setup it happens about 1/3 of the time you try to go from SD to HD or vice versa. Setting the box to only use 1080i output (no 4:3 override) avoids this problem at the expense of having to live with the de-interlacing and scaling that Motorola has bothered to include in the box.
So a workaround is to use a DCH box at a fixed resolution, such as 1080i regardless of whether you are watching an SD or HD channel. Not particularly satisfactory for folks who have top quality displays and/or external video processors, but what can you do? Most customers have no competing service they can turn to.