Vizio VM60P HDTV10A Service Manual page 93

PDP display nothing (AV1<S-Video1> without screen)
Block1
Is composite
signal on?
Check U18 pin 11 (CHROMA1)
YES
is there signal?
ONFIDENTIAL – DO NOT COPY
Check internal cable?
N0
Connect (CN9) cable
Check Connect Board
No
Check Q4 base is there signal?
Check collector voltage +5V
YES
Check U18 pin 5 (LUMA1)
YES
is there signal?
Check Connect Board
No
Check Q3 base is there signal?
Check collector voltage +5V
Check:
1.C12 (signal AC coupled)
YES
2.R19
3.R21 (75ohm impedance)
Is there signal?
No
Q4 fail
Check:
1.C18 (signal AC coupled)
2.R18
3.R20 (75ohm impedance)
Is there signal?
No
No
Check input source
No
Check input source
File No. SG-0214
Q3 fail
Page 10-4