I just bought, Nov 30th 2009, a Mitsubishi WD-65C9 DLP rear projection TV. So far the picture is great and I would be very happy with it. But, audio over the HDMI ports is filled with severe crackling and popping sounds. It happens to all three HDMI ports and with all of my HDMI devices. The volume of the popping varies with the volume level on the TV so I imagine the aberration is being introduced before the preamp.
1) COX communications HD DVR box set to output 1080i video and audio via HDMI
2) Home Theater PC with an ATI Radeon HD 4770 Video card. Latest drivers. Windows 7 Ultimate x64 OS. This card has an HDMI port on-board so there is no adapter in between.
3) Portable laptop. HP Mini 311. This netbook has an on-board Nvidia ION graphics processor and an HDMI port. Windows 7 Home Premium x86 OS. Latest drivers.
The audio crackle occurs with all three devices and on all three ports. I do not have this problem with my component connected devices (DVD player, Nintendo Wii). And if I switch my HTPC over to DVI video and Analog Audio there is no problem with the audio.
I am using HDMI Class 2 cables. I have three different brands. All are shielded and have ferrite. None of them make any difference with the audio problem.
I have also tried various settings on my HTPC; changing the bit depth and sample rates to no avail.
I've had a Mitsubishi tech out to look at it once. And low and behold, it wouldn't crackle while they were here ~2 hours. They did a system reset and said to call them if it started again. I have done so and I am waiting for them to call me back.
What I am seeking advice on here is to see if anyone else is having this problem and if anyone has any suggestions on how to fix this myself or things I can prompt the technicians on. I have taken a few audio recordings of the popping and crackling sound as proof for the techs already.
Thanks for your time!