i want to learn cheap lavel repairing so what to do
hello durga..start by seeing if there a local school that has classes in basic electronics. there are few books out there that will tech you the basics. in the us most computer vendors wont let you work or train if you cant pass or have the aplus tests. http://certification.comptia.org/getcertified/certifica...
it a small test that lets people know you have the min in it skills.
hardware wise...having a goos soldering iron and skills. a volt meter and a o-scope or signal tracer and a post card..one that read the cmos and shows where in the post a pc is hanging.
paperwork wise you have to learn how to read a flow chart..debug chart..if the mb vendor will send you one. you have to learn what voltage on signal should be on a device that your debugging.