My LG 37LC2D issue: when I power it up it takes a very long time to show a picture (now about 10 minutes), (as if it needs to warm up) if the TV have been on for a while I can power it off and then back on with no long wait, it is only when the unit is cold or have been off for a long while.

Are you using a HDMI CABLE if so you might try a different one to see if this clears up.

I have an LG as well.
My troublshooing says:
"Check the power control setting.The power supply may be interupted.
Check if the Auto sleep feature is actiated in the Time settings.
Refer to the " Sleep timer".
If there is no signal while the TV is on, the TV will turn off automatically after 15 miutes or so"

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.

Hello there,

I believe the Audio/Video Inputs/Outputs could be going out .

If you are using the HDMI try the Component cables and connections or AV cables with the S-video

if you swap the cables around and the problem is still there let me know and we try a few more steps thank you and don't forget to Rate

I am having the EXACT SAME problem. Mine started yesterday.

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

Ur Tuner signal board have problems,must be change.The problems u discribing,only two boards cause this Power or Tuner boards.

Check for a popped capacitor on the power board. They are the round tube looking things with a cross or cross type shape on the silver flat top. Check they have not leaked and are still flat topped. The one your looking for is about 8mm diameter on right hand board. Take the back off, i suggest putting it face down on a mattress with a blanket support. Take care not to lean on it. When the backs off you will see 3 circuit boards the power board is the smaller of the 3 on the left, looking from behind. Good luck.