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.

Likes(1)Dislikes(0)

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

Likes(0)Dislikes(0)

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

Likes(0)Dislikes(0)

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

Likes(0)Dislikes(0)