Sparking Sound In JVC TV
The complaint of this JVC CRT TV was the sparking sound when it was turned On. It was actually the arcing sound from the Flyback Transformer anode cap area to cold ground.
The moment I lifted up the cover the first thing I saw was the part of the top anode cap had gone missing. The rubber materials seems to have deteriorated over the years of usage- see photo below:
In order to safely remove the anode cap, you must first discharge the high voltage by poking (recommend flat type screw driver) the anode cap with a wire connected between the screw driver shaft and the cold ground. Sometimes you will hear a “pop” sound, sometimes no sound at all. If no sound means the high voltage already been discharged and you can safely remove the anode cap. In most of the time when you hear a ” pop” sound you may need to discharge it few more times to really make sure there is no more high voltage.
Once you have done cleaning the anode cap area, you then can apply the silicone around the anode cap as this way it can prevent the arc from shorting the cold ground-see the photo below:
It is not tough to repair this kind of problem. I knew that many repairers already stopped repairing CRT TVs or Monitors and already shifted to repair LCD/LED TVs. But you need to know that many countries are still doing the CRT repair. As a repairer, if customers want me to repair their CRT TV/Monitors I will do my best to help them out. This can also help to save our environment.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link:
https://www.jestineyong.com/lg-dvd-video-out-problem-repaired/
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concerned citizen
September 22, 2015 at 8:54 pm
good one.yes there are many areas still into crt tv. Question is what is the name of the Silicone you used. is it any type of silicone or should it be pure.and what about the temperature range it can be used. maybe you can just post a picture of the silicone box with the info so we can know. thanks
Corriete
September 22, 2015 at 9:02 pm
great work. can you help with this...i have a crt precision tv model # PTV14R88 Chassis # TMP8823CPNGSVA4 that the voice is on with the menu and blue screen which are all normal. when i connect cable NO PICTURE.still voice and the menu can be seen and controlled. I changed the tuner but did not help. all voltages are good on the tuner. can you help in this regard?
Paris Azis
September 29, 2015 at 9:47 pm
Hello Corriete
What do you mean by "when I connect cable NO PICTURE"? Is this the RF cable to the antenna input or a "scart" cable carrying both the video and audio signals?
Well, in the case of RF reception, since you have the sound, your trouble is far beyond the tuner. Also since the On Screen Display is O.K, then the video amplifier circuitry is also O.K. Therefore you must see if the video switches are in order. The same holds true for the direct scart connection. In this case, check additionally the video cable for continuity and then look for dry joints on the PCB (given that the sound is O.K as you say).
I don't see anything else causing such a problem.
Best Regards
Yogesh Panchal
September 22, 2015 at 9:40 pm
Good work Suranga thanks for sharing.
Henrique Jorge Guimarães Ulbrich - Brazil
September 22, 2015 at 11:33 pm
Good job, Suranga. And congratulations for your willingness on contributing to save the environment.
Robert Calk
September 23, 2015 at 2:41 am
Thanks for the article, Suranga. Here in the USA you can't even give a CRT TV away. But I still like learning about them because my Tektronix scope has a CRT in it. And there are still some old people that love their big CRT TV's.
Paris Azis
September 23, 2015 at 2:59 am
Hello Suranga
Nice repair, no matter the obvious cause of the problem.
I remember only two similar cases I repaired all these years back. Moreover, they were both having developed a hole in the H.V cable, which I had repaired simply by closing the hole with thermally glued silicone I put around it.
The last case was an old Sony set, a real piece of art, all its cabinet made out of high quality wood! I faced the problem after having replaced the burned out horizontal transistor, which in reality was not a transistor but a “gate turn-off thyristor”, a very expensive device at that time, with Sony pioneering with its use, which also had no equivalent replacement, the type being SG 613 (if my memory doesn’t cheat me after so many years. It was the end of the eighties…The set, when first powered on, produced the sound of a machinegun, scaring the customer to death as I was working in his home)…
Well, in your case, I would bet that the plastic seal was either eaten by a rat, or somebody had poured a kind of liquid chemical from the top of the plastic back cover in the set. I have no other logic explanation for it.
Anyway you fixed it properly.
Thanks for sharing the experience.
Best Regards
Chris
September 23, 2015 at 5:54 am
No mater is the repairing hard or not, complicated or not, the most what count is saving the planet from junk electronic stuff.
I like people who doesn't care if it is a CRT or a PLASMA TV they just repair it.
Nice job done.
My best regards.
George Persico
September 23, 2015 at 11:33 am
When I repaired CRT TV's I used GE Silicone tub and tile White seal (pure silicone) for all types of High Voltage repairs. Around flybacks, to stop arcing at damper tube sockets, on HV triplers, Anode leads etc. The only drawback is that it needs to "cure" overnight. Yes I sure do remember Sony SG613 thyristors. Ruined many before using the light bulb trick to identify shorted components.
Gopal Sharma
September 23, 2015 at 1:37 pm
Thanks for sharing. I have a 21" crt tv problem, that tv is around 20 yrs old but kit is new. I have cleaned the anode area inside and outside and replaced the cap two times with good quality but it always burns to flame after few days, it is very dangerous. when it is replaced, it works fine for few days and not sparking initially. gradually sparking starts and burns dangerously. How to solve this problem.
Paris Azis
September 28, 2015 at 4:25 pm
Hello Gopal
If after the cap replacement and before its burn up the picture is O.K, check first the good grounding of the external bare wires around the CRT to the chassis ground. Next to it try to clean the entire external surface of it and reapply a graphite coating on it using graphite spray produced exactly for this purpose.
Keep in mind that the internal and external coatings of the CRT form a filter capacitor for the High Voltage at its anode. So this cap has to be in perfect condition, being properly grounded as well.
This might cure your problem, taking into account the fact that the electric current always looks for the easiest way to its return path. In your case the anode current instead of feeding properly the anode of the tube it stays there needing to escape in the way you describe.
Just test this as you have absolute nothing to lose.
Best Regards
Gopal Sharma
October 6, 2015 at 7:13 pm
After cleaning the area and cap, the picture is clear and no sparking. But after one or two days anode cap gradually heating and sparking started then finally burn to ash. Is this due to old CRT mismatching with new model kit because kit is newly changed.
Allan
September 24, 2015 at 1:39 am
I truly like this repair.Thumbs up Suranga. Early during this year a friend of mine told me that he also heard a sparking noise on his CRT TV. He became paranoid and got rid of the TV. I am so sure he had the same problem.