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No Picture I have a mitsubishi projection tv that has raster but no picture, I have checked tuner and video board, but no luck, I can pull up the menu, but it still won't program any channel to memory, it seems like its not connected to cable, but I know it is.

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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

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Hi,

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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When the sound is working and the picture is not it indicates the main power supplies are working but the picture supply is not. The picture supply that powers the projection tubes is a high voltage generator and is very expensive to repair. Not even most tv techs now how to troubleshoot them. So, I cannot recommend you repair it yourself unless you are a trained high voltage tech.

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(i) Make sure that the power cable from the TV is securely plugged into a functional wall outlet.
(ii) Then, check to see if the TV/Video setting is correct: when watching TV, it's set to TV, and when watching connected equipment, it's set to video 1,2,3, etc.
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(iv) If the LCD projection TV's power is ON, and LAMP indicator is flashing red then the lamp for the light source burns out. Replace the lamp with new Sony XL-2000U replacement lamp.
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check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.---- a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.---- with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT. excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen. check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines. -------- for getting any required parts to replace you can get it from www.radioshack.com or from www.partstore.com or from www.shopjimmy.com --------- thanks.please do rate the solution.thank you for using fixya.keep updated.

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