Hitachi20in TV When iam switch off the tv its coming one white spote onthe center of CRT few second.I am not a experiencedTech.pls someone help me.

Check if G1 is not connected with GND
If so, check the G1 circuit

However is G1 is connected with GND,
there's nothing you can do because the
problem is CRT.

This is my opinion

Maybe other tech can come here and tell
his opinon

HELP!

low emission CRT.

This happen to my newly bought JVC TV.It takes 3 month before the problem dissapeared by itself. Don't add any parts for crt,just wait.

There are several issues can cause this and spot suppression is not for the the amateur. The usual yes is a tube issue but you require the G1 voltage to be greater than the G2 at switch off so there are several methods to do this using diodes and capacitors etc.

I would suggest that you take that unit to a repair shop that has been recommended to you by word of mouth by your friends,relatives,co-workers or neighbours as that is the proper way to find an honest and qualified tech,they may be an authorized shop for that brand or they may not,they may be a store front or home based but they would be qualified to fix it as stated by the many notices manufacturers place on the back of their equipment for customers to read and respect.

If you attempt to repair the item yourself you will definetely not fix it but instead create more problems,a risk of fire and personal injury and afterwards a lawyer will come to you and tell you "lets sue this tech for $XXX XXX as it won't cost you a nickle or a dime,you penny pincher,spend thrift,nickle & dimer,low baller,cheapskate,tightwad,freeloader,toe picker and hustler" and the lawyer would screw you just like a car mechanic and the only thing you would get out of it is a free jar of vaseline and a pillow.

Finally it takes years of formal training to acquire this knowledge usually by community college/vocational school (some by correspondense courses or the like) as well as training afterwards by manufacturers or from everyday personal experience working on stuff combined with expensive dedicated test equipment,service manuals and in some cases repair tips that we share through the internet.
In plain English:

take it to a repair shop as we have to make a living just like you" also if it was just cleaning,a loose wire,or a burnt fuse we would be rich.By way that tech that replies to customers on this site should stop even if it requires sacrificing his dominating authority and attention whoring.