My 4.8 years old tv just black out, try change the 3 pin socket fuse n even try restart also no response at all. Model KS7500 the evergreen first batch Quantum tv. Is it worth repair or not, samsung sc quote repair around 550-650 just to change the power supply or the motherboard n that's doesn't include labour. Anyone here from mainland penang can recommend repair center other than Samsung service center. Tq