LG 720p 50" Plasma NO SIGNAL when components hooked up correctly

This might require attention by a qualified service technician.

Hi it may be the tuner.Try a different input, if your on the coaxle input try a video in "rca"input. or vise verse.

Connect the Wii and the DVD player to different ports on the TV to and any other device to the port in which the Wii and the DVD player were connected to check if the issue is with the port.

If other devices also display in black and white after connecting them to the port to which the Wii and the DVD player were originally connected then the ports require servicing.

If you just bought it call where you bought it and tell them they need to send a repairman out to fix it.

Well it depends on what your watching on the tv. If you hook up an HDMI cable with a dvd player or other accessory, such as HD cable box on an HD channel it will swap to 720p.

switch the HDMI cable to another HDMI port (if available).
or use and AVI/COMPONENT to make sure the device (HOME THEATHER) is working fine.
Try also another HDMI cable or hook another device into it to see how it works.
If you determine the HDMI port in not working properly, then your Mainboard is damaged and need to be replaced, try EBAY for a general picture of prices but you will need your product code wich is located in the back of the TV next to serial number.

Plasma TV normally do not have the resolution required for PS3 unless the plasma TV is fullHD( 1920x1080p) pixels.

HD Ready Plasma = 1024 x 768p
PS3 Outputs = (fullHD)1920x1080 or (HDReady) 1280 x 720p.

LCD TV accepts the resolution matches the resolution the PS3 is outputting.

Replace batteries of your LG remote.

There was audio so we knew that there where setup issues involved. We mixed the blue and green cables. :-o It now works.

Have you made sure the box is set to send a HDTV signal to your LG? Example 720p, 1080i, or 1080p? You usually have to set the resolution in the v+.