Sir I need eht coil nomber in hair 21F2A - Televison & Video

Even if you have the part number I'd be surprised if parts would be available for a CRT TV

If you wish to get some details; check the site linked here. Pull up older posts.
https://elektrotricks.blogspot.com/
https://electronicshelponline.blogspot.com/
faults & possible causes of LCD & CRT screen are given with illustrations. You can get an idea about the fault to an extent. Search the site by type in the brand name of your set, in its search bar at the right side column, and press enter. See it in Webview with mobile or by desktop. Mobile View has no search box.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Circuit diagrams of SMPS section of many popular brand devices are given. Search the site by type in the "brand name" of your device, in the "Search box at the top right of the Homepage" to get gathered related posts.

https://electronicshelponline.blogspot.com/
Circuit diagrams of many popular brand TVs and other devices are given. You can get details there.

Sir , 17" in tv ka eht ka price kitna hoga

If you have confirmed that the EHT has shorted the EHT must be removed out of the board if you need to find the replacement from a general electronic store as the EHT can be indetified . If you choose to order from LG, then all you need is to quote your TV's model number. Contact LG support center.
http://www.lg.com/us/support/index.jsp

Your question is not clear.
However if the main EHT drive transistor failing often check all the diodes and capacitors. Sometimes you can not check the diodes for reverse leakage. Better replace the diode with identical type and part no.

If your EHT coil is failing, buy a similar coil with identical coil resistance value. Generaly new EHT coil can not fail in a short span.

Take care while handling E H T areas. It is more than 25,000 volts A C & DC.
Extreme caution needed while disconnecting the suction cup on the
picture tube. Switch off wait for few minutes every time you attempt.

I am Rahul Dubey. vidisha (Bhopal) mp .
u can call vodaphone care 111 than u can ask him what is my mobile nomber. my nomber is......9770035557

sir
please tell me my haier tv model no.21f2a service menu code

1A23-0009-0030-1888-9634-4297