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Vizio VS420LF1A power supply?    
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2004FLHRSI



Joined: 13 Aug 2011
Posts: 5

PostPosted: Sat Aug 13, 2011 9:11 pm    Post subject: Vizio VS420LF1A power supply? Reply with quote

Vizio LCD VS420LF1A.

Won't power up from panel button or remote, yet has the front 'Vizio' pilot lamp in amber.

Probing the power supply, seeing 5 volts on the connector going to the main digital board, but 12 volts is absent.

Lines on the connector are labeled:
Inverter
DIM
5 V
12 V
GND

Does the power supply board receive a trigger signal from the main board (inverter line) to start 12V and the lamp supplies? Or is the supply likely at fault?

The heat sink on the controller is getting warm, so think the board is functioning, somewhat.

Any clues from the experts?

Power supply number: 0500-0405-0700
Main digital board: 0171-2271-2813

THANKS!

Matt
Google

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2004FLHRSI



Joined: 13 Aug 2011
Posts: 5

PostPosted: Mon Aug 15, 2011 9:15 am    Post subject: Reply with quote

Anyone have a theory of operation or a service manual for this model? Hate to dispose of it if it's something simple.

Thanks.
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