Hello,could be a matter of many things.You wont find out till you have it tested.It might be a minor problem,power transistor,resistor,diode.Something might of short circuited,or open circuited.The voltage will have to be tested ,resistance,etc.Theese tend to be cheaper repairs,but you will be charged also ,for labour costs,the time it takes to repair.More expensive repairs involve,the horizontal out-put transformer.Is there any colleges around your area?Where they train in electronics.As most take repairs in,as part of the training,the money goes to college funds,you might wait a bit longer,to get it repaired,but it is certainly much,much,cheaper.
Mr.James Devlin., March 2008
