Question about Vizio XVT472SV 47 in. HD-Ready LCD TV

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Relay clicks when applying power. Yellow light comes on. TV is dead otherwise. Power supply is outputting +5, 12, and 24 volts Mainboard (3647-0282-0150) has +5 and 12 volts always applied. Checked all 8 regulators (3 different types on board) all appear normal. Power on switch has no control; set appears dead! What else on the mainboard might be suspect?

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Amber light on means standby voltage is high. IF amber light does not go white when power button is pushed the its one of two things.
A. No power on command from main board. Usually labeled PS-On. Should go high from 3.3v or maybe 5volts. If not present Main is defective.

B. If the ps-on line is going high then your problem is a defective power supply.

Posted on Oct 15, 2013

  • Steven Kingsley Oct 17, 2013

    I think the solution offered by Mr. Long is correct; i feel comfortable in puttint

  • Steven Kingsley Mar 10, 2014

    I've been fiddling with this VXT472SV fo 3 months - now wanting to pay over $100 to replac3 the mainboard. i discovered a service manual for this (only flowcharts, no schematics) of a similiar model (VL470M) and found out that the sflow steps checked out except last step. This calls for +1.08v reading at pin 7 of U16. U16 is a G5627 PWM buck converter. Whwn I scoped ths pin I found approx. 10 mhz pulse at this output pin. There is a filter network after this pin but shoud I still show roughtly 1.08 volts filtered at this PIN?



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