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Hi I'm getting intermittent sparking (mainly on wet days) from the high voltage connection where it meets the back of the TV (under the rubber cap). what can I do to fix this?

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This is caused by moisture building around the EHT cap. Try drying off the dampness with a hairdryer & make sure the area around the cap is clean. It is also better to keep the TV in a room that is not prone to the cold or in an area where condensation can build up for example do not have the TV near a window. Also if you remove the rubber cap be careful to ensure you discharge any static voltage from the underside first.

Posted on Jun 24, 2009


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When i turn it on it makes a screeching noise

This type of noise usually comes from a CRT based tv will be from its EHT cap. EHT cap is one which connected to the top of the p[icture tube, through which the extra high tesion voltage is supplied to it from the line output transformer. Normally there will be a smell of Ozone gas from the back side of the TV. Eht cap is a silicon rubber boot that protects the inner high tension voltage from being come to contact with open air. Due some reasons, if this rubber cap has some trouble; the extra high tension DC voltage supplied to the CRT [it usually come up to 32KVDC [32,000 VDC] will happen in contact with the open air, and if the humidity in air also is great, arcing will take place, converting Oxygen in the air to get converted to Ozone. If you look through the ventilation holes of the TV, in absolute darkness, you can see a bluish glow there aroung this anode cap. In some cases, this rubber cap can be replaced with a new one if available. if it is not available, you have to replace the line output transformer; otherwise called as [LOT]. This anode spot is a dagerous one for an unexperienced person to handle. because charged voltage will be there for a long time after switch OFF the TV.
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I get interferance mainly red and green lines appearing on top of the picture plus crackling noises

Please put off your tv and open the back side of the TV. Look for dirt on the back side of the CRT that is causing the arcing of the high voltage. So when the high voltage is sparking against the ground section the lines are coming to the screen. So use a good dry cloth to clean and wipe clean.Use a good solvent like methy spirit to clean. Check to trial and repeat if the fault is repeating. Make sure the HT lines are not touching but keep them apart to redduce the sparks. Hope this will get the TV right. Good day

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1 Answer

Toshiba 35

turn the tv off ,disconnect from power source , then you can
wait 1 hour appx. ,for the crt to discharge it self ,or you can
being very  carefull discharge the crt by inserting a long
screw driver under the ground strap that runs across the crt
(thats the metallic one ) the other screw driver under the anode
high voltage cap (thats the one that connects to the top center
of the crt) then short the two screw drivers together ,you should
see a little spark if there was any voltage there ,after that you
can solder  all the cold solder joints.
May I suggest that you check the main chassis also for cold solder joints.
I have checked many a TV.,and I always check the main chassis  to prevent callbacks.

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1 Answer

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The anode cap on the back of the tv tube is leaking the high voltage be careful as going into the back of a tv it store very high voltage and could be fatal.the solution to problem get a tube of clear or red silicone discharge the high from the tube,you do this by getting a alligator clip with wire attach clip to a ground wire on the back of the tube attached the other end of the wire to screw driver gently push it under the Anode cap you will hear a popping sound with i little sparks. remove the cap from off the tube get some alcohol wipe the dirt away apply the silicone around the anode and the anode cap place in on back and leave it to dry and cure for about 7 hrs close up back and turn on your tv and all the popping sound is gone.good luck.but if it is the wire for the anode cap that comes from the flyback is the one leaking change the flyback.again good me on or email me at

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13 Answers

How to discharge the TV tube?

First off there is no capacitor that holds the High voltage on the tube. Its the tube itself that stores the charge and if you dont discharge a tube properly it will bite you!!You can disconnect the 2nd anode of the tube(thats what the cup is called)that puppy can hold a charge for months as I've picked up used tubes that other service men may have striped out of a junk sets and still got zapped weeks later and it can burn a hole right in you if it bites you the right way. That metal strap is the ground for the crt(the picture tube) The proper way to saftly discharge a crt would be to take a screwdriver perferably a flat tip and connect a cliplead to the screw driver and clip the other end to the ground strap. Carefully slide the screwdriver up UNDER the cup on the crt till you reach the middle of the tube as you will feel it as it wont go any farther. In the meantime you might hear a pop sound and that would be the dischargeing of the tube.. Keep that screwdriver in place a min. of 30 to 40 secs. then remove . Then pinch the cup the oppisite direction on both sides that the wire is running as the cup is held in place by a small hooks on both sides Be carefull not to rip off the cup or bend the small hole suround that the cup is attached. And never ever poke a hole in the cup as I've seen peeps do and when you turn back on a set you will have fireworks as the high voltage will arch out all over the place and if your hand or face is close to it it will get you too!! Now take the clip lead and attach to the grounding strap and clip the other end to where you just took off the cup and your all set.Good Luck with your repair

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