Vizio P50HDTV10A Service Manual page 29

PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Pb signal)
BLOCK 1
Is no blue color on screen?
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Pr signal)
BLOCK 1
Is no red color on screen?
PDP DISPLAY NOTHING(RGB)
BLOCK 1
Is picture on screen?
Check U22's signal output
R signal C238,R180,R169,U22.34
G signal C237,R177,R171,U22.31
B signal C235,R174,R176,U22.28
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No No
Check component 2
(Pb signal) C288,R213
Is there sync?
Yes
No
Use GProbe connect
from main to PC. U10 fail
Does scaler detect the signal?
No No
Check component 2
(Pr signal) C284,R210
Is there signal?
Yes
No
Use GProbe connect
from main to PC. U10 fail
Does scaler detect the signal?
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)
Check U24
outnput pin 28
No
Input pin 15
U24 fail
Input clamp voltage pin 5(+5V)
Output clamp voltage pin 29(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
Yes
Check before U24's circuit
1.C289,C290(AC coupled)
2.R211
3.R217(75ohm)
Check U24
outnput pin 34
No
Input pin 11
U24 fail
Input clamp voltage pin 1(+5V)
Output clamp voltage pin 35(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
Yes
Check before U24's circuit
1.C276,C281(AC coupled)
2.R215
3.R218(75ohm)
Yes
Check U45
H sync input U45 pin1,R185
V sync input U45 pin5,R187
No
Check input source
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)
No
Input source fail
No
Input source fail
Check U45
pin 14 +3.3V
Yes
U45 fail
5
No
U22 fail
Page 9-10
File No. SG-0219