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Re: TV screen comes in and out when first turned on.
Is the video going in and out or is the whole set with the sound going off as well. If the sound stays its a cold solder connection on the vert output device or the B+ line feeding the ic or if the whole set is going on or off its a cold solder connection on the Horizontal driver transformer. Without more info its hard to tell.
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Go to your Menu options, and look around for a RESET option. You want to basically do a factory reset on your TV. (I'm assuming you turned off the setting, the system confirmed it, but it never turned off?)
One of the things an HDMI connection does is allow the TV and equipment to talk back and forth to each other. When you turn the TV off it ends this connection but when you turn it back on, it doesn't communicate correctly. The analog inputs don't do this that's why when you change inputs and go back to HDMI it works, because the TV reestablishes that connection. You didn't list the model of the TV but go to "http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp" and click download. Enter the TV you have and click "GO". A list of downloads comes up and your TV may have a firmware update for it. There is instructions on how to do it. Even if this doesn't fix this problem, it is still good to do to avoid other problems. Another solution is to use component (Red/Blue/Green) cables. The highest resolution they support is 1080i, HDMI is 1080p. Depending on the model of your TV and what your watching though, you might not see a difference. TV2 will never have this problem because it is not connected through HDMI.
Most DLP TVs have a color wheel. This allows the TV to be manufactured with a single chip to control the color for each spot on the screen and a white light source. As the wheel rotates, the desired color light gets transmitted to the screen. This happens so fast that most people do not see the screen refreshing each color.
Usually the symptom of a failing color wheel is the TV being very noisy on startup (a whining sound) followed by it shutting down. Although other problems can be involved - for example a power problem going into the assembly with the wheel (there is a motor that turns the wheel).
Pioneer Elite Pro rear projection 620HD - Picture is still there but brightness and "white" have faded over years allowing for mediocre viewing when room is dark only. During the daylight picture is visible if viewed straight on and within 15 feet from set. Any suggestions?
42" Plasma Flat screen TV - recently problem started with a solid black background over top half of screen during viewing (comes & goes). A few days ago, when TV was turned on, green light came on then changed to flashing red light in 4 signal flashing pattern, but no audio or video. Phoned Philps Cust Serv and was told to download system upgrade on USB but it did not work. Philips referred us to Service Repairs who charged $85 for coming to home and without even opening the TV, said it will cost approx $1000 for "boards" plus his service, and he could not guarantee the TV would work.