My 52" Mitsubishi DLP works great with a hi def input signal but with the DVD player or regular TV signals shows a slightly tilted series of faint lines in the background. Not impossible to live with but annoying.
Any idea what causes it? Could it be an artifact of a weak signal?
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The cable box signal on the components video have a too high refresh rate frequency, that is the reason for the lines. Use RCA cables or an alternative connection. Other solution is changing the display out settings for cable box (from PAL to NTSC etc.)
Since this is an older first generation (1999) HD TV it may not be compatible with newer HDTV receivers because the standards back then were different - Make sure the HD cable box is plugged into the HD component inputs on the back of the TV (not the DVD inputs) and that the menu setting on the TV is set to DTV (not RGB) video. This TV will only accept 480i and 480p signals on the DVD input. Also the HDTV input will only accept 480i,480p and 1080i (it will not work with a 720p signal,make sure your cable box is not set to that mode)
What is your TV input connection? Are you using Antenna? Cable? Dish?
The Unusable Signal sounds like the TV is not getting a signal. Does your TV have a built in HD Tuner?
If you are using Antenna you might want to try setting up the connections and it should search for quality channels that you get good signal strength. If you are on channel 2 and there is no over the air channel 2 it may say "unusable signal".
first try resetting and rebooting. reset = menu, 2470, enter. reset is press reset button and wait for green lite to stop blinking. if that takes care of it great. if not it sounds like a signal board or dm problem and will need repair. check out www.tv-techs.com
anytime you connect componet signal (green red and blue)to regular video inputs (yellow) end will have same effect. make sure that if you are using component signal from dvd player you have to connected to component input in the set.
component signal will use green red and blue for video and red and white for sound.
I strongly doubt it's the lamp assy since you can actually see the blue screen. If the lamp failed, you would not see anything on the screen. This blue screen indicates to me that either the tuner is no longer decoding the signal, in improper input has been selected (ie: input 1 is selected while actual signal is on composite 1), or something of that nature. If you are getting audio then the input is selected properly but the video decoder has failed.
If your cable signal is going through a VCR or DVD, disconnect it from there and go directly to the TV (ie: bypass the VCR/DVD). If your picture comes back, there's some kind of problem with your VCR/DVD player.
If you have multiple inputs, try connecting an input signal to another input (ie: video 1, or aux from a dvd player) and see if you get a picture there. If you do get a picture, the whatever input you're currently using has malfunctioned.