Question about Mitsubishi VS-70707 70" Rear Projection Television

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No picture, high voltage cable sparks at left tube/gun at turn on

No picture, high voltage sparks from cable at connection to first tube/gun on left when looking in from rear of set, when pressing the on button of remote.

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  • rkoehler873 Jul 30, 2009

    I really can't see inside the grey plastic shroud to the cup itself (and I don't want to remove anything yet to inspect it since I don't know what residual high currents may be there even with the power off and that HV spark really looks nasty and lethal).

    The red cable also has some black electrical tape taping it to the shroud where in enters the shroud at the top of the tube but the spark seems to be coming from inside the shroud and arcing down the red wire about an inch!

    It could well be coming from the cup itself.

  • rkoehler873 Jul 31, 2009

    Got prof. diag. Result: CRT cooling fluid leaked from Red CRT causing short to ground. Green CRT also beginning to leak fluid but not yet shorted. New parts no longer available and too costly to repair. Thanks Mitsubishi for selling me a piece of junk. You just lost a customer for life. Set lasted only 8 years. I have a Toshiba 36" Tube still like new after alsmost 20 years, a Sony 27" Trinitron still great after almost 30 years, and a GE Portacolor still working after 40 years! I expected a better product from Mitsubishi...........I was dead wrong!

  • rkoehler873 Jul 31, 2009

    Got prof. diag. Result: CRT cooling fluid leaked from Red CRT causing short to ground. Green CRT also beginning to leak fluid but not yet shorted. New parts no longer available and too costly to repair. Thanks Mitsubishi for selling me a piece of junk. You just lost a customer for life. Set lasted only 8 years. I have a Toshiba 36" Tube still like new after alsmost 20 years, a Sony 27" Trinitron still great after almost 30 years, and a GE Portacolor still working after 40 years! I expected a better product from Mitsubishi...........I was dead wrong!

  • John Snow
    John Snow May 11, 2010

    Does it look like the sparks are coming from the wire or the cup that hooks to the CRT itself?

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It sounds like you have a shorted picture tube.
You should call a good TV Tech to confirm this and get an estimate.

Posted on Jul 30, 2009

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1 Answer

Top left and right corners are dark on my 55 inch seiki tv


The picture tube could be getting old.

Normally this effect can also be due to alignment with the magnetic meridian.
You can try to de-gaussing with a high voltage gun.

http://www.repairfaq.org/sam/crtfaq.htm

see section

CRT Age Resulting in Dark Picture

Aug 20, 2016 | Televison & Video

1 Answer

Picture flickers every few minutes


There are several possibilities. This model is based on CRT (picture tube) technology, and has a high voltage circuit. This circuit consists of three heavy wires, one from the side of each picture tube (red, green and blue) going to a single connection block. There is another heavy wire from this to the high voltage transformer on one of the circuit boards.

First, unplug the set, and wait 20 minutes to make sure everything is cool and residual high voltage charge has drained away. Check the wires at the connection block to make sure they are not loose. There is usually some sort of retainer clip to lock the wires in place, make sure these are not broken or unlatched (sometimes they get brittle with heat and aging). Frequently these are covered with a thick layer of dust held on by electrostatic attraction; gently vacuum this off. If all looks good, plug in the set, and wait until it's dark outside. Turn on the set with the room lights off, and look at the high voltage parts. If you see a blue corona glow or sparking, that part has an insulation breakdown problem or a bad connection. It is normal to see an orange glow at the bottom of each picture tube, and you would also see the three colors of the picture coming out of the tops of the picture tube. WARNING: do not touch the interior of the set while it is on, especially not in the dark.

Another probable cause is a cracked solder connection on the power/deflection board (the one with the high voltage transformer on it). If the flickering is one color rather than white or a momentary darkening, the problem is in one picture tube circuit (yellow -> blue dropout; ->cyan -> red dropout; magenta -> green dropout). The picture tube circuit includes not only the high voltage (second anode) section, but also the picture tube drive connection on the base of the tube all the way back to the video processor and switching circuits.

Apr 04, 2015 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

When I switch on my tv set I see spark/ firing in the picture tube. What are the reasons ?


I'ts your high voltage wire connected to your picture tube.High voltage wire is very near or touching the back tube which is a ground connection.Keep it away from any ground.

Sep 22, 2012 | Televison & Video

1 Answer

Have a Sony KP-65WV600, already replaced d board once, and replaced convergence ic's once also. Now as soon as I turn unit on, turns to red screen and shuts off, video that is, audio works ok, noticed...


Check High voltage Block.After replacing ic's (STK convergence ic's) you need to adjust Black&White scale.Turn ALL screen adjustments to min.Turn TV on and adjust screen slowly for each gun (I would start with Red first ) when you came to point that you see red background with white lines across, at that point G2 is too high (that will cause TV to shut down,don't worry just lowered adjustment and turn tv back on) so adjust to proper voltage and do the same for each gun.After that, adjust focus for each gun (again all controls are on High Voltage Block and HVB is mounted on front of your tv after you take speaker gril out) black box with 6 controls' screen RGB, focus RGB .
You should do that in dark room in order to get perfect Black&White scale,when all guns are adjusted properly you will see grey picture.Make sure 'Color" adjustment on your display is down to 0. Another step is convergence adjustment ,Flash Focus etc.If TV stil shuts off after all, your Red picture tube is short inside,take crt pcb from tube,make sure TV is unpluged from power before that, and turn Tv on .If stays On tube need replacment...good luck)

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1 Answer

Red coloring on my tv


There is a problem with the color "guns". In a cathode ray tube TV there is one for each color. A sharp jolt can misalign these guns or the voltage on one may have become much larger than the others.
DO NOT attempt to fix this problem yourself. Extremely high voltages are present on and around the picture tube, where the magnets for the these "guns" are located.
HIGH VOLTAGE persists for WEEKs after the set is powered off. Consult a qualified TV technician.

Oct 06, 2009 | Zenith B27A11Z 27" TV

1 Answer

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.

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3 Answers

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1 Answer

Locating the ''flyback transformer '' on a rca mod #R52WH74


It is usually large and black. Its the one with the rather thick red wire coming out of it. The other end of that wire either connects directly to the picture tube or into a distribution block which distributes the high voltage to the 3 picture tubes (guns) in projection TV's. Be aware that this transformer produces high voltage and can store voltage even when the set is unplugged. I hope this helps.

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1 Answer

Color problem


Hi, it is more likely from an open green and/or blue picture tube's electron gun transistor driver.
If you have an experience on electronics / or use of solder gun, you can just open your monitor and look for the electronic board at the back of the picture tube. Take a look in all transistor ( components with three legs) and solder / check if their legs are not fully soldered to the board. Note: just be careful on the high voltage diode / line ( the one with a thick (like the car distribution wire cable) single wire going to the tube). good luck

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2 Answers

Tv is sparking and making noise?


Warning: Flyback Transformer Failure. ( extreme high voltage ) 22,000 Volts +

Do not attempt to fix this without another human being present who's trained in CPR.

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Azkeyz, Wizard Division.

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