Vizio VP50 HDTV20A Service Manual - Page 21

Rouble, Dc-dc, Converter - boards

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ROUBLE OF DC-DC CONVERTER Start Yes N0 J10 PIN10,11,12 Yes N0 J10 PIN 2,3 Yes N0 U1 pin 5 6 7 8 Yes N0 U4,U2 pin2 Yes N0 U10 pin2 Yes N0 U33 pin2 Yes N0 U7 pin2 Yes U9 pin2 Yes U35 pin2 The voltage is about + 5V 1.Check power board 2.Check power cable connection J10 The voltage is about + 12V while power switch on 1.J10 connection good 2.Check J10 Pin2,3 transform +5V_TUNER 3.Check power board The voltage is about +5V while power switch on 1.J10 connection good 2. Check U14 OPWRSB & OPCTRL2 Pin The voltage is about +3.3V The voltage is about +2.6V The voltage is about +3.3V The voltage is about +1.2V The voltage is about +1.5V The voltage is about +3.3V END CONFIDENTIAL - DO NOT COPY Page 9-5 File No. SG-0246

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CONFIDENTIAL
–
DO NOT COPY
Page
9-
5
File No. SG-0246
Yes
N0
The voltage is about + 12V while power switch on
1.J10 connection good
2.Check J10
Pin2,3 transform +5V_TUNER
3.Check power board
The voltage is about +5V while power switch on
1.J10 connection good
2. Check
U14 OPWRSB & OPCTRL2 Pi
n
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N0
N0
N0
N0
N0
N0
ROUBLE
OF
DC-DC
CONVERTER
Start
J10 PIN10,11,12
J10 PIN 2,3
The voltage is about + 5V
1.Check power board
2.Check power cable connection J10
U1 pin 5 6 7 8
U4,U2 pin2
The voltage is about
+3.3V
U10 pin2
The voltage is about
+2.6V
U7 pin2
The voltage is about
+1.2V
U33 pin2
The voltage is about
+3.3V
U9 pin2
The voltage is about
+1.5V
U35 pin2
The voltage is about
+3.3V
END