This is my first post and I would like to thank all you for all the advice I have been reading till now
I recently purchased a Denon x2000 avr and hooked it up with a sony 670 TV and TataSky HD DTH Box and xbox 360.
Initially I setup as it should be ie all HDMI connections i.e output to TH ARC HDMI and all inputs into properly marked HDMI inputs.
However I had so called 'earthing' problems ie I switch on/off some light in the room and I will hear it from the amp + the tatasky box was outputting video OK but sound used to come randomly - apparently some specific power on sequence worked ...but changing channels /sources - sound goes.
read lot of posts and suggestions.
tried various things like changing hdmi ports etc - no use.
got house wiring checked as well. and all devices nowdays come with 2 pin jacks and I dont have polarized plugs.
got tatasky technician to visit also and he says as long its working directly with TV its ok.
Then I connected the tatasky box to TV and optical out to the AVR thus isolating all electrical connections between the tatasky box and the avr and 'earthing' issues go away.
the setup works fine .... till you change channels on the tatasky box - again sound goes. if you switch the avr on/off it comes back !! so everytime I change channels , I need to switch the avr on/off
have disabled all HDMI settings like bravia sync (ie ARC) in TV, HDMI controls in AVR.
AVR works fine with xbox, HDMI connection.
tatasky box works fine with the TV - HDMI connection.
AVR and tatasky hs box done work fine with each other !
So the question is whether the problem is in the tatasky HD box or the avr ?
will appreciate and any other advice/suggestions to solve this vexing issue ...and optimizing my setup.