Vizio P50HDTV10A Service Manual page 30

PDP DISPLAY NOTHING(RGB on PIP mode without screen)
BLOCK 1
Is picture on screen?
Check U22's signal output
R signal C233,R180,R169,U22.34
G signal C232,R177,R171,U22.31
B signal C231,R174,R176,U22.28
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Check U45
No
H sync output U45 pin4,R181
No
V sync output U45 pin8,R184
Is there signal?
Yes
Check U22 input signal
No
R pin 2, C239;C241(AC coupled),R186,R172(75ohm)
G Pin 4,C234;C236(AC coupled),R166,R175(75ohm)
B Pin 6,C221;C224(AC coupled),R164,R173(75ohm)
Yes
Check U45
Check U45
H sync input U45 pin1,R185
pin 14
V sync input U45 pin5,R187
No
Check input source
Yes
Check U22
No
Input clamp voltage pin 1(+5V_V1)
Output clamp voltage pin 35(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select low (0V)
+3.3V
Yes
U45 fail
U22 fail
6
Page 9-11
File No. SG-0219