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

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.

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1 Answer

Good sound no picture


A older set------look to see if display comes on (channel number or menu) if not someone has to look to see if the filaments in the three picture tubes are lit or not.

Several voltages : High voltage, screen voltage, filament voltage all go to the picture tubes.

Oct 30, 2012 | Sony KP-61V75 61" Rear Projection...

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

My rca p52926 picture cuts in and out


If model number is correct (on rear of set in small letters it should be a PTK 195 chassis) you have a high voltage lead somewhere that is arcing.

This set did have issues with the High Voltage transformer failing and also that High Voltage (well over 10,000 volts) gets distributed to each of the 3 picture tubes this model uses.

Sometimes the lead where it connects to one of the tubes begins to arc---it is coated with white silcone to prevent this.

If arcing around the entry point to any of the tubes sooner or later it will take the set down--destroy parts that are currently ok.

Usually we locate this by turning set on with back off and looking and listening when set is turned on---If a frying or pop is heard up above the main boards--one of the entry points (called the 2nd Anode) is arcing.

I have seen them arc hard enough and long enough to actually crack and break the glass wall of the picture tube.

May 16, 2012 | RCA P52926 52" Rear Projection Television

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

Tv went off and won't come back on.


the arcing sound is some kind of high voltage leak, which will shut down the tv. pull the speaker grill off and the access board, look at the 3 picture tubes, turn the set on you will see where the leak is, it's usually the high voltage splitter, which has a high voltage wire going into it and 3 high voltage wires coming out going to the picture tubes, if it arcs from the splitter you need to change it, if it arcs from one of the picture tube wires you need to pull the tube out and fix the high voltage leak, and possibly a cooling fluid leak caused it, not an easy reapir, you probably need a repairman.

Sep 08, 2009 | RCA P52926 52" Rear Projection Television

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.

Mar 10, 2009 | RCA Televison & Video

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.

Thank you for choosing FixYa!
Azkeyz, Wizard Division.

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1 Answer

Need help


No high voltage to the Three picture tube guns. The high voltage splitter could be defective. You have audio but no video I presume.

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1 Answer

Vs-5043 No Filaments lighting on any of the guns


Yes you have no High Voltage, and you have filaments if you look at CRT's and they are dimmly lit on neck of tube.:::::This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source) 1. Shutdown at power with self diagnosis error 2-1. At power on check for 12-volts DC at connector KH pin 8, if missing check IC9C51 part # 270P990010 and L9C52 part # 441D009020 on the Signal PCB

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