42HL196 causing IR remote interference

My 42HL196 appears to be emitting modulated IR light which is causing interference with the IR remote of one of the set top devices I use with this TV. I know the problem is coming from the TV backlight, since the problem arises immediately when I turn the tv ON, and goes away when the TV is turned off or when I hold a towel or blanket in front of the screen. I didn't think this was technically possible from CCFL backlighting, until a quick web search of "LCD IR Interference" turned up a surprizing number of pages of links describing the problem with various LCD and plasma TVs from a number of manufacturers. After reading some of these, further experimenting revealed that the problem with my set occurs for a few minutes right after it is turned ON, after which the set top box starts correctly receiving IR remote commands again.
It was suggested in many of the search links that one simply wait a few minutes for the TV to "warm up" before trying to use the affected remotes, others suggested disabling auto brightness/backlight settings of the TV, or placing tape or thin paper over the front IR window of the affected device. Still others recommend replacing the TV with a model that uses LED backlighting, which, so far, haven't been reported with this problem (I've confirmed the absence of the problem with my other set , an LED-backlit Sharp Aquos).
These are all unacceptable solutions to me, so I opted instead to minimize the amount of TV panel light reaching the front of the device without diminishing its sensitivity to the remote. The device couldn't be relocated from its position on the TV stand, so I glued a small, 3/4inch long 3/8inch diameter black plastic pipe right onto the IR window of the device, having the open pipe end facing the sofa. This seems to work well as long as there is nothing close to the TV unit that can reflect panel light back into the added "telescope hood". The remote range doesn't seem to be affected as long as I use it directly in front of the TV stand, so I can live with this solution. The added wart on the front of the set top device is a bit clunky looking, but certainly no worse than the piece of masking tape suggested by some. I suspect the pipe length could be shortened but I didn't experiment any further.
I note that there are a few Toshiba owners on this forum with similar complaints, albeit not specifically about the 42HL196. I discovered in my search one manufacturer (not Toshiba) actually admitted on their support website to a design flaw in certain series LCD TV models, offering a free circuit board replacement in those sets where the problem was experienced. I have not seen any similar response from Toshiba, at least not to the few complaints on this forum regarding IR remote interference.

called toshiba today, neither they nor the engineer's manager were aware that the engineer failed to turn up.... personally i've had enough.
i can't see a way forward other than legal action. i've lost two days due to Toshiba messing up, and their typical reponce seems to be try updating a random driver or change a random part... i cannot afford to carry on with guess work. i asked for them to replace the laptop and was led on a wild goosechase... had to speak to 5 departments, eventually, one of the managers told me the case was escalated and i had no option but to wait another 48 hours.... how can i trust them to get back to me after they've repeatedly messed up? and to add insult to injury, the manager gave me a contact number i could try calling his department on should i need to... i know i wrote the number down correctly because the entire conversation was recorded... and guess what? he gave the wrong number to his own department. i found the right number online, tried calling, was told he just returned to his desk, was put on hold, 5 mins later was told he was in a meeting and will call back... did i get a call back? nope.
i will wait until wednesday afternoon, their 48 hours... after that it's a letter to their head office, 7 days to resolve the problem, should they fail to do it, i am taking them to small claims court for replacement laptop or refund, + expences for lost time and expences.
well done toshiba.
i've had enough. will not be updating this forum anymore.... i'll now let the courts decide.

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As of right now I've been able to make significant improvement to the noise problem and have eliminated it by 90%. The high pitch noise through my monitors is virtually eliminated but I still notice a faint bit of added noise when interface is powered on and connected to my computer via firewire versus when the firewire cable is disconnected.
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What kind of sound card are you using exactly? It seems like you're sound card is picking up EMI or RFI from your computer when it's plugged into a wall outlet. Are you using a power conditioner in your setup to help clean up your power supply?
Try googling EMI & RFI, there are many online resources which detail how to troubleshoot and deal with these problems. http://www.arrl.org/radio-frequency-interference-rfi
I finally solved my problem by upgrading to a higher quality audio interface (Focusrite Pro 40). This was able to cut out the high frequency RFI signal being output from my MacPro computer. I get the feeling many of Mac's higher end computers tend to output dirty electrical signals which is why so many people have this similar problem.
Try cleaning up your power supply, then maybe use different, higher quality sound cards or interfaces with your setup to see if the issue gets solved. The problem most likely lies with your computer and if you can get a high quality interface that can cut out the noise, that may be your only solution. It worked for me.
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