They are Samsung authorized service center in San Jose, Ca. Samsung doesn't have any other authorized service center. My Samsung TV started switching on/off and I complained to Samsung. Samsung opened trouble ticket and gave it to TV Unlimited folks. The technician came to my house and first he said it doesn't look like power supply issue (without opening the TV). On opening the TV, he replaced the power supply and it worked. He said he will call his boss and find out the charges and came back to me with BIG estimate to fix it. he said Samsung covers ONLY for capacitors.
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