Vizio VP50HDTV10A 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?
R signal
G signal
B signal
CONFIDENTIAL – DO NOT COPY
No
Check component 2
(Pb signal) C288,R213
Is there sync?
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
No
Check component 2
(Pr signal) C284,R210
Is there signal?
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Check U45
H sync output U45 pin4,R181
No
V sync output U45 pin8,R184
Is there signal?
Yes
Check U22's signal output
No
C238,R180,R169,U22.34
C237,R177,R171,U22.31
C235,R174,R176,U22.28
Check U24
outnput pin 28
No
Input pin 15
Input clamp voltage pin 5(+5V)
Output clamp voltage pin 29(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
Yes
No
U10 fail
Check U24
outnput pin 34
No
Input pin 11
Input clamp voltage pin 1(+5V)
Output clamp voltage pin 35(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
No Yes
U10 fail
No Check U45
H sync input
V sync input
Check U22 input signal
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
Input clamp voltage pin 1(+5V_V1)
Output clamp voltage pin 35(+5V)
Input_switch_select low (0V)
No
U24 fail
Check before U24's circuit
No
1.C289,C290(AC coupled)
2.R211
3.R217(75ohm)
No
U24 fail
Check before U24's circuit
No
1.C276,C281(AC coupled)
2.R215
3.R218(75ohm)
Yes
Check U45
U45 pin1,R185
pin 14 +3.3V
U45 pin5,R187
Yes
No
Check input source
Check U22
No
U22 fail
VCC3 pin 22,23(+5V)
Input source fail
Input source fail
U45 fail
5
Page 9-10
File No. SG-0219