Hi I have a Toshiba 36A41 that started to make a loud poping noise in the tube. It also displayed angled raster lines and got very brite. Powering off on produced a flashing power led, and nothing elense. The set after sitting did power on but the picture is now heavy green. I DL the service manual and tried to reset the white balance. When cycling through the values for each driver (for the guns) Green and Red are fine, as in you can go to their max. When adjusting the Blue value it on 3 ocasions produced the same poping on in the tube and produced a high tone. Reducing the value (turning down) would stop the problem. The thing is I cant produce white with the lower values. So is the problem in the Tube or can it be the driver circuit for the blue gun screwing up?
Also when adjusting the 5 values RCUT GCUT BCUT GDRV BDRV, is there a set sequence that should be followed? I get what I think looks good but when I check a thin horazontal line which should be white if adjusted properly, its always a different color. Im just wondering if there is an approach to acheaving the desired balance.
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The symptoms you describe is the main processor controller is about to fail, when that happens the tv will eventually become unuseable. if the set is more than 5 to 10 years old you will be further ahead to replace the set.
If it got like that gradually suspect a low emission condition on the Blue gun inside the picture tube, this condition can sometimes be fixed by running a gun cleaning procedure, this is done with a crt analyser device at a repair shop. The other cause for a no blue picture could be a Blue color output that has stopped working, the loss of blue is suddendly when the color out fails, it could also be a problem in the signalprocesing circuit. I suggest having it checked by a tech because it would be something you could not check, first because of lack of equippment and second, you would need some technical troubleshooting skills to do the job.
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.
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I have the same vacuum - it's a clog in the brush area, or where the hose connects to the base. Unhook the hose, like you're going to use a tool. Lay the vacuum flat, so you can stick something in the plastic tube (at the base where you disconnected the hose) without the awkward angle. I use a dryer vent cleaner, but you could probably use a wire hanger. Push through until it comes out through the brush area...should fix your problem.