Question about Televison & Video
Without a model number of the set you own, it makes it difficult to suggest a remedy since Mitsubishi made a substantial number of projection tv's over the years. Model components change from one to another and from one year to the next. In addition, since this is more of a clarification post, what kind of raster is it, snowy, plain or muted due to of lack of signal? Can you input a video source (DVD, VCR, Camcorder) and have it show on the screen? When you say you checked the tuner, what did you check?
Posted on Oct 16, 2008
Let us try eliminating the video process by connecting an external video source such as a DVD player in any of the Audio/Video INputs. Doing so would confirm the tuner (and/or perhaps the logic) circuitry.
Most TV tuners would use a 33 volts reference voltage for the VCO to shift frequencies. The 33 is normally regulated by a dropping resistor and zener combo. Pls check this as they could be the issue. It may be to your advantage if you could post the brand and model of the PTV or at least the tuner block.
This is of course assuming that you are familiar with electronic circuitry and components, use of a DVM and safe practices involve when performing voltage checks on a live unit.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Posted on Oct 16, 2008
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Posted on Jan 02, 2017
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