My LG 37LC2D picture suddenly goes black and then if I bang on the corner of the set sometimes the picture will return. What is wrong with my TV?

The unit is stuck in standby. Have you tried turning it on manually on the set or changing the batteries in the remote. Does the light flash when you try to turn it on?
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By the highly technical manner in which you set forth the problem, I can see you are far more electronically savy than am I, BUT just a thought: Is there there any sort of timer setting in the TV menu which may be cutting it on and/or off, and which you have somehow failed to notice? Good luck. . .

It sounds like the TV is having sync issues with your Sky+HD box. HDCP is the "High-bandwidth Digital Content Protection" that is used between components. It requires a sync between the devices to ensure that you are not trying to "steal" the video content you are watching. This intermittent message and blacking of the screen is good evidence that this is your problem.

Even though the HDMI cable worked fine on another set, I'd try a new one anyway. Some TVs and components are more sensitive than others, and a weakened cable may not show a problem on one set, yet show it on another.

Barring the new cable not working, check LG's website for a possible firmware update for your TV, and also try using a different video source, like BluRay and see you have the same problems.

Beyond that, it may just be an issue with the TV itself starting to die.

Hi,Sounds like the TW box is the problem try swopping the box with a new one.
Good luck

Here are the pictures of the board for your TV, LG 37LC2D: http://www.shopjimmy.com/catalogsearch/result/?q=LG+37LC2D

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

mine just did this tonight as well.... no answers yet?

You can purchase a cable to connect to the Audio Out ports on the back of the TV. It will have 2 RCA connectors on one side that plugs into the TV and a 1/4" stereo jack on the other end that you will connect your headphones to. You could even pickup a pair of wireless headphones... they will have a volume control on them! I hope this helps.

Try replacing batteries and reprogramming both remotes.

This is a simple and common problem. The solder joints on the vertical output IC have cracked loose. I actually did a housecall on the exact same set with the exact same symptoms this morning! A good tech will resolder the pins of the vertical output IC and all other major solder joints on the main board and the set will play fine.