Vizio P50HDM - 50" Plasma Panel Service Manual page 70

PDP DISPLAY NOTHING(RGB on PIP mode without screen)
BLOCK 1
Is picture on screen?
Check U22's signal output
R signal
G signal
B signal
CONFIDENTIAL – DO NOT COPY
Check U45
H sync output U45 pin4,R181
No
V sync output U45 pin8,R184
Is there signal?
Yes
No
C233,R180,R169,U22.34 R pin 2, C239;C241(AC coupled),R186,R172(75ohm)
C232,R177,R171,U22.31 G Pin 4,C234;C236(AC coupled),R166,R175(75ohm)
C231,R174,R176,U22.28 B Pin 6,C221;C224(AC coupled),R164,R173(75ohm)
No Check U45
H sync input U45 pin1,R185
V sync input U45 pin5,R187
No
Check input source
Check U22 input signal
Yes
Check U22
Input clamp voltage pin 1(+5V_V1)
Output clamp voltage pin 35(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select low (0V)
Yes
Check U45
pin 14 +3.3V
Yes
U45 fail
No
U22 fail
6
File No. SG-0174
Page10-10