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Tv powers up,but no raster - Televison & Video

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If you have sound and its a "standard" set with a picture tube someone would have to see if the filaments in the neck of the tube are lit or not.

Posted on Nov 01, 2012

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Problem with rca big sreen tv


First, try a hard reset.
You must unplug the power cord (turning off the set or the strip will not do it) for a couple of hours, then try again.
This will sometimes correct the problem
When it blinks off: Does the raster go dark or just the picture and the raster remain?
If the raster goes dark when it blinks off it means there is a loss of high voltage to the picture tube. High voltage repair is expensive. It may be a failing flyback transformer that is functional inside the horizontal deflection circuits.
If the raster stays on and you just lose video (picture information) then it may be a simple intermittent IC chip in the video board area. It may require a technician to determine which IC and how to replace it or the parts associated with it, but probably not terribly expensive to repair.

Jan 12, 2008 | Televison & Video

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Sony lcd no raster no sound


Check and replace damaged component/s at its main power supply regulator section circuit. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

Jan 20, 2014 | Sony FD Trinitron WEGA KV-36FS120 36" TV

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Power light is on but no picture


you did not mentioned if you have raster or none, if your tv has raster but no picture your problem is in your I.F. section and your tuner, now if no raster, you can check your power supply, check your 5volts, 9volts, and 12volts check any alternatives that cause of no picture..

Sep 09, 2013 | Toshiba 40RV525U 40 in. LCD TV

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Toshiba 24" led tv mo. 24ps1e VGA is ok raster snow is ok ,after connection of cable only chroma picture seen,no Y signal.


Try to reset it to the factory settings and Them remove the power cable for atleast 5 minutes but Will be better to power OFF for 12 hours

Jul 18, 2013 | Televison & Video

1 Answer

No sound no raster


Unplug your projctn. tv. Open the rear end and try to locate the power fuse near the power plug, it's made up of small cylindrical glass. Replace it with same rating as labeled on the fuse itself. ;-)

May 24, 2009 | Samsung Televison & Video

1 Answer

No power indication,no rasters,and no sound. Only click sound.


Go to the Anantek website and search for your TV or similar TV's to see if anyone has posted repair hints. I've fixed several TV's and other electronic equipment from their website.

Jan 29, 2009 | Televison & Video

1 Answer

Sharp 32'' tv -no raster showing channel numbers only


since you have sound and display it's not the hivoltage. You're electron guns are not being turned on. Most likely the IC which biases the guns or the IC which contains the biasing resistors.

Jan 28, 2009 | Sharp 25R-S100 25" TV

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TV dead; unresponsive, no raster, nothing.


You may have lost the standby power supply. There should be a 5v supply that runs with the set in standby, see if you can find that. Also check for B+ (around 160VDC) at the large filter capacitors in the power supply.

Oct 06, 2008 | Toshiba 36A60 36" TV

1 Answer

Sanyo TV Model# DS32224


This is usualy because there is either a high voltage regulation fault, or a main power supply regulation fault.

There are many things that can cause this. When the high voltage goes too far down, the raster will enlarge. High voltage regulation can be caused by faulty components in the feedback sensing, or in the high voltage multiplier, or in the flyback windings itself.

A quick way to sort of know if the high voltage is regulating is to wind the brightness and contrast from one extreme to another and observe the raster size. If the raster is changing size with the brightness on the screen, the regulation is not working well. In some of the low cost sets there will be about a 2 to 5% raster size shift in this case. The high end sets will have a near 0% shift in the raster size. A size change of about 2% is acceptable for most sets. If the CRT is weak, this test will not work well, because a weak CRT will not properly load.

If the main power supply is operating slightly over voltage, the raster size will increase. Usualy, the brightness will be a little on the high side when the supply is too high. Voltage regulation faults can be from warn components in the voltage regulator area, or in the feedback control.

This should be looked after by an experienced TV service tech. This type of fault can be involved.

Jerry G.


Nov 09, 2007 | Sanyo DS32224 TV

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