I have a toshiba 32" lcd with built-in DVD bought it in 2006 and the screen stopped working, when I turn the tv on, there's no video, but I can hear the audio. None of the onscreen menu's displays show anything either, so it's not related to any connection to external device (eg. cable box). One minute the tv was working, and the next the screen went blank and has stayed that way ever since.
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I have the same problem with my 65HM117. Funny, but it started just when I was getting a FREE repair for a Samsung LCD tv with bad caps on the power supply about the same age as the 117. The problem according to Samsung tech (who was kind enough to look at it while he was here) is the DMD (digital mirror device) chip, the "processing" part of the DLP (Digital light processing). Suggested I call Toshiba. Toshiba rep, obviously not in the USA, told me Toshiba doesn't make DLP's anymore "because of all the problems." They apologized repeatedly, repeatedly pointed out the unit is "out of warranty," but NO help or recal even though they know they built a product with defective, unreliable technologyl. Bottom line, Toshiba lost a customer but SAMSUNG has one for life! I'd repair it, but can't find the part number for the board with the DMD...
The problem could be dirt on the surface of the lens, you can clean this by removing the cover of the dvd player .
Gently use a dry cotton bud to clean the lens because the lens is fragile.
Insert the disc plate into the dvd player and press play, if it does not play try the second method.
Ensure the cover of the player is open, connect the power plug to the mains socket and observe the lens if it beam a red light, Also check the ribbon cable use to connect the lens to the printed circuit board, then gently clean the lens with a dry cotton bud , insert the disc plate and press play to see if it play.
If it does not play the disc, then this require a change of the lens
I have the same problem with a 40" Toshiba LCD, Component cables work fine with FIOS but not HMDI, goes in and out then blank. HDMI with DVD player works fine. Best buy reported this same problem from users with this toshiba lcd but no solution.
Does it work with a DVD or VCR? How is it connected? With a Coax cable or a an RCA component cable? Check that the correct video source is selected (The one associated with the input you are connected with) or that you are tuned to the correct channel on the TV if you are using the coaxial cable to connect. Could be channel 3 or 4 but I have seen them set for channels like 73.
If the screen is lit, then there is high voltage. If there is no video, and the screen is lit, then there is a loss of video. The fault can be anywhere along the main video path before it gets decoded in to the red, blue, and green compositions.
If the screen is not lit, most likely there is a high voltage failure, or there is a failure in the bias supply for the tubes.
When there is a loss of high voltage, this can be from any of the components in the high voltage area. Some of the main things that go defective are the flyback, high voltage multiplier, and various other small components.
Have you considered to replace the set with a good Plama or LCD set? This repair may end up being on the expensive side.