REPAIRS OF SHARP CTV 20"MODEL 20R-SC

I AM A REPAIRER,I HAVE 20"COLOR TV ON BENCH NOW TO REPAIR.THE PROBLEM IS,IT STAYS ON FOR ABOUT 6 SECONDS WHEN YOU SWITCH IT ON AND OFF TO STANDBY.MEANWHILE WHEN YOU PUT ON THE SERVICE SWITCH IT STAYS ON WITHOUT SOUND. I NEED EXPERT IDEA TO REPAIR THE SET.

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