Premtech, you helped me with my anote? cap problem- I followed ur instructions and am waiting for rubber sealant to dry. I heard a tiny spark when I pryed the cap off but no big shock. I cleaned it up a little, sealed it, and put it back on. It seems I'm missing a step? was I supposed to replace it? or follow it back to the flyback transformer? I basically took it off and put it back on, is that right?
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Re: rca arcing and hissing
Just remove it - put a small ring of HV putty on and reseal the cap making sure to get the anode inside the well securely...
There is no drying time to HV putty, are you sure that's what you used?? It's a clear and rubbery kinda like silly putty, easy to form.
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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.
It is best to contact an expereinced service person to get it repaired. OK.
Normally an arc or snap like that is coming from the anode cap that attaches to the top center of the crt. The voltage there is upwards of 25k so be VERY careful if you're going to inspect this for any faults. If it is the cap leaking unplug the set and take a piece of wire attached to a screw driver with the other end of the wire attached to the grounding cable around the outer edge of the crt. Gently undo the cap from the crt and allow the blade to sit in the well for a period of time to discharge the crt completely.
Next get some HV putty, sold at most electronics distributors like Mouser and form a small ring with it. Place it around the well hole in the crt and replace the anode cap pressing firmly to seal the edges of the cap to the crt. With the back still off plug the unit in and see if that's cured the problem.
Don't know what happened to the last post I sent you its disappeared.
What I think you should do is definately replace the CRT white socket (tube base plug).
You can either take the CRT number from the label on the tube & put it in to google then search for Crt base plug.
Or see if there is A repair shop local to you who can order the tube base for you.
Are you definately sure the arcing is external to tube & not happening in the tube neck ?
Is the CRT made by LG / PHILIPS. These are notorius for for arcing over internally I must write at least 1 A week off for this problem.
If you can still run the set try tapping the neck of tube with screwdriver handle if pic flashes or goes predominately1 colour you are looking at the tube with internal short.
If this is the case there are ways of trying to get rid of the internal short let me know what you find ?
Your problem is flyback transformer cap is leak or tared due to ageing or rust. Since it is high voltage transformer your boyfried get shock.
If you have technical knowledge or technical support just try the following process. Switchoff the tv and remove power chord from plug. Wait minimum 4hrs. Then remove the back cover clean picture tube and transformer cap with IP solution. After allowing 30mins dry switch on the tv. All the process will be done by service engineer only. Risk of electric shock.
two common problems with RCA TV's. It sounds like your flyback is going on you. There is probably a hole and it is arcing off a cap/ or something.
You can order a new one or you can try and find where it is arcing by taking the back and looking at it in the dark to see where the arc is coming from. If you can find it try using a plastic epoxy to fill the hole
Sounds like you have a high voltage arc if the sound is not coming through the speakers.
Possibly the high voltage leads are not pushed in all the way. Be careful! Make sure the set is off and you may also want to ground these leads before you touch them. Youcan get a nasty shock if you don't.
It seems that there is EHT Leakage from the EHT Transformer Anode Cap!
Generally happens during rainy seasons, or if your TV is placed near a window or near an AC, due to excess of moisture in the air.
Unplug the TV and wait for an hour to discharge all residual charge in Capacitors. Open the back, and look for a thick red cable leading from the FBT. (It is a Black Block with a thick red cable running from it to the rear of the Picture Tube). Take a sturdy Electrical cable with the conductor visible at both ends. (Multimeter Leads will do.) Now, ground one end of this lead to any Metal part of the Chassis, and gently ease the other end under the Cap of the EHT Cable. BE VERY CAREFUL, as there are very High Voltages involved!
Do it Gently, and you will hear a POP! This indicates that the Electrical Charge inside tha Picture has been discharged.
Now Take dry cloth and wipe clean the area around the Anode Cap.
Close the back of the TV, and switch it ON. In all likelihood your problem should be resolved.
BUT, I REPEAT, DO NOT DO THIS UNLESS YOU KNOW WHAT YOU ARE DOING, AND ARE VERY VERY CAREFUL.
Otherwise, seek professional help!