Question about Toshiba 43H70 43" Rear Projection Television

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Help it power`s up the crt`s are lit but no hight voltage, but when i tap the chasses the high voltage comes on and pic is jumpey like a vert proublem need help

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Resolder the vertical IC that is whats making the CRTs go blank. Its a safety issue where the CRTs blank when there is no vertical deflection. Just resolder the output IC that should cure your problem

Posted on Mar 12, 2008

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IM A TV TECH. I HAVE A SONY LCD KP-60XBR800 I HAVE NO RASTER. POWER OK, MENU OK BUT NO RASTER ON TUNER, TUNER VOLTS OK,CAN YOU HELP ME PLEASE. THANKS my email sergioaguirre0182@hotmail.com


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.

Sep 06, 2009 | Projection Televisions

1 Answer

NO HIGHT VOLTAGE


sounds like the LSB is defective as that controls all the high voltage and deflection circuits. If you go to the following link and leave them a email with your model number they should have a LSB board for your model.
http://servicemanuals.vstore.ca/

Nov 21, 2008 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

Have sound no pic


Hello tshotwell,

I would start by checking the IHVT for High Voltage output this can be done with a HV probe. Then if no HV is present I would check to see if the filament voltage for the CRTs is working, after that I would check the CRTs using a CRT tester (checking for shorts). These are a few of the beginning test that could be done. You will need a schematic of the TV, a High voltage probe, a CRT tester (can be purchased from ebay) and a multimeter. If you do not have experience in electronics, I would suggest having a TV repair person check the TV out for you.

Sep 07, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Sony Wega television


If it is the set i am thinking about,you need to replace all 3 video ics mounted on crt borad.one of them is shorted causing set to shut down high voltage and sound.

Jul 08, 2008 | Projection Televisions

1 Answer

Help


You have got to have a cold or cracked solder joint. Get a strong light and go over the chassis with a magnifying glass. Solder everything that doesnt look shiny but be looking for hairline cracks in the solder especially near the vertical output IC and associated components.

Mar 12, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

No video on a 50H82 Toshiba Projection


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.


Jerry G.

Mar 10, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Toshiba 43hx70


i dought it, check aroiund the convergence ic's "stk392-xxx"

Feb 08, 2008 | Toshiba 43HX70 43" Rear Projection...

1 Answer

Flashing


well you can tap the convergence board and the crt boards see if you can find a loose connection, however be careful there is high voltage

Feb 01, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Powers up no pic


You have a bad solder connection in the Vertical deflection circuit. Try re-soldering the vertical output IC and the Vertical yoke pins. You may have to look over the Vertical circuits with a magnifying glass to actually find the bad solder . A hint if the solder looks dull re-solder it.

Jan 23, 2008 | Toshiba 43H70 43" Rear Projection...

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