When I hook up my LG plasma to PS3 and Cable box, I don't get any sound or colour on the PS3. The TV /cable box works fine. Any ideas on the wiring?

SOURCE: LG t.v is saying no signal on the screen for the cable box and a dvd player.

if the sky box is not registered with your viewing card, it will not show. if you want to check that the monitor is working plug in a dvd to make sure its not the monitor that is at fault.

SOURCE: LG 47" LCD TV - 47LC7DF Clicking Noise

I was told that these clicking noises (which happen on my Magnavox LCD too) were due to the "power required" at the internal switch. Seems that the power required to immediately turn on the TV is too much for a standalone household outlet, so it "surges" power in a series to get enough there. Hence, the clicking sounds are actually mini power surges to send more power to the internal circuits to turn the TV on.

If your set is like mine, these noises generally stop after a minute or two, correct?

SOURCE: LG LCD/DVD TV no sound on TV - DVD works fine with sound!!!!

HERE is the servce manual for this TV

SOURCE: ps3 wont work on lg tv with hdmi cable

With the PS3 and the TV properly connected and both units off turn on the TV and set the input to the proper HDMI setting then press and hold the power on button on the PS3 until it beeps twice. This should resolve your issue. Please let me know how it works for you.

SOURCE: No Picture on LG 50PC3D

No power?
Unplug power cord- safety first!
open backcover
check powersupply- top center right is p.s.
top left side of powersupply you'll see 5 capacitor 3300uF 10V.
see any pop up on top? replace it All with same rate or 16v is O.K.
do not use temperature rate 75c. Use 105C.
if you know how to solder. you could save $300 at least!