Vizio VA320M Service Manual page 21

32"LCD TV
3. No display (LED indicator White)
(A)U401 X243 don't work
Check key board
OK
Check "+5V" Q702 Q708
OK
Check U703 all power, R761
OK
Check U401 ,U403 all power
OK
Check X402 = 54.1MHz
OK
Connect ISP tool to CN408 , check reply
message if X243 boot
OK
Update FW again
(B)U401 X243 work
Check the source
OK
Check LVDS cable
OK
Check "+12V" panel power Q701, FB402
OK
Check BL_ON signal CN701 Pin 1
OK
Check panel
NG
Repair the key board
NG
Replace Q702 Q708
NG
Replace NG components
NG
Replace NG components
NG
Replace around NG components
NG
Replace U405
NG
Reset source
NG
Re-plug in LVDS cable
NG
Replace Q701 FB402
NG
Replace main board
NG
Replace panel
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VA320M