ViewSonic VE510+-1 Service Manual page 40

T DC-DC C
ROUBLE OF
ViewSonic Corporation
ONVERTER
Start
correct?
Is U5 pin1
Yes
+5Vx correct?
Yes
VLCD correct?
Yes
3.3Vx correct?
Yes
END
37
The voltage is about + 12V
No
1. Check power adaptor
2. Check power cable
3. Check FUSE1
The voltage is about + 5.0V
No
1. Check U5 output
2. Check L17 frequency
No
The voltage is about +5.0V
Check C57 & pin 8 of U6
No
Check U11 output
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