Repair Flow Chart - Vizio VT420M Service Manual

42"LCD TV

7. Repair Flow Chart

1. No Power (No LED indicator)
Check power cord and board interface
OK
Check F703 C701 C719 C727
OK
Check U702 C724 C708 C738
OK
Check R4145 Q413 Q405 R4158 Q404
Q414
2. Can not start (LED indicator Orange)
Check key board
OK
Check "+5V" U702
OK
Check U407 all power
OK
Replace U407 components
NG
Plug in power cord and interface
NG
Replace F703 C701 C719 C727
NG
Replace U702 C724 C708 C738
NG
Replace R4145 Q413 Q405 R4158
Q404 Q414
NG
Repair the key board
NG
Replace U702
NG
Replace NG components
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VT420M