The 4021 is $170 at Costco and the 4221 is $250 at Bestbuy. Other than a 2" difference in length, a different remote and Wifi bluetooth capability, there appears to be little difference between the two, especially in terms of performance. Any thoughts on whether it makes sense ot spend the...

I have a Vizio vw42l that flashes like a stobe light. When this happens there is a flashing blue light on the master backlight inverter and a clicking noise in the center of the power supply. Pwr supply voltages all check out. Also there are two 35Volt 470 uF caps on the master and slave B L...