Vizio P50HDM Service Manual - Page 68

PDP DISPLAY NOTHINGAnalog HD2 without Pb signal, PDP DISPLAY NOTHINGAnalog HD2 without Pr signal,

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PDP DISPLAY NOTHING(Analog HD2 without Pb signal) BLOCK 1 No Is no blue color on screen? Check component 2 (Pb signal) ÎC260,R197 Is there sync? Yes Check U23 No outnputÎpin 28 No InputÎ pin 15 Input clamp voltageÎpin 5(+5V) Output clamp voltageÎpin 29(+5V) VCC3Îpin 22,23(+5V) Input_switch_selectÎhigh(+5V) U23 fail Use GProbe connect No from main to PC. Does scaler detect the signal? U13 fail Yes Check before U23's circuit No 1.C268,C269(AC coupled) 2.R211 Input source fail 3.R217(75ohm) PDP DISPLAY NOTHING(Analog HD2 without Pr signal) BLOCK 1 No Is no red color on screen? Check component 2 (Pr signal) ÎC254,R192 Is there signal? Yes Check U23 No outnputÎpin 34 No InputÎ pin 11 Input clamp voltageÎpin 1(+5V) Output clamp voltageÎpin 35(+5V) VCC3Îpin 22,23(+5V) Input_switch_selectÎhigh(+5V) U23 fail Use GProbe connect No from main to PC. Does scaler detect the signal? U13 fail Yes Check before U23's circuit No 1.C256,C261(AC coupled) 2.R215 Input source fail 3.R218(75ohm) PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Y signal) BLOCK 1 Is picture on screen? No Check component 2 (Y signal) ÎC287,R212 Is there sync? Yes Check U24 No outnputÎpin 31 No InputÎ pin 13 Input clamp voltageÎpin 3(+5V) Output clamp voltageÎpin 32(+5V) VCC3Îpin 22,23(+5V) Input_switch_selectÎhigh(+5V) U24 fail Use GProbe connect No from main to PC. Does scaler detect the signal? U10 fail Yes Check before U24's circuit No 1.C282,C285(AC coupled) 2.R209 Input source fail 3.R216(75ohm) 4 CONFIDENTIAL - DO NOT COPY Page10-8 File No. SG-0174

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CONFIDENTIAL – DO NOT COPY
Page10-
8
File No. SG-0174
4
Check component 2
(Pb signal)
C260,R197
Is there sync?
No
Is no blue color on screen?
No
Check U23
outnput
pin 28
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)
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD2 without Pb signal)
BLOCK 1
U23 fail
No
Check before U23’s circuit
1.C268,C269(AC coupled)
2.R211
3.R217(75ohm)
Yes
No
Input source fail
Check component 2
(Pr signal)
C254,R192
Is there signal?
No
Is no red color on screen?
No
Check U23
outnput
pin 34
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)
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD2 without Pr signal)
BLOCK 1
U23 fail
No
Check before U23’s circuit
1.C256,C261(AC coupled)
2.R215
3.R218(75ohm)
Yes
No
Input source fail
Check component 2
(Y signal)
C287,R212
Is there sync?
No
Is picture on screen?
No
Check U24
outnput
pin 31
Input
pin 13
Input clamp voltage
pin 3(+5V)
Output clamp voltage
pin 32(+5V)
VCC3
pin 22,23(+5V)
Input_switch_select
high(+5V)
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U10 fail
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Y signal)
BLOCK 1
U24 fail
No
Check before U24’s circuit
1.C282,C285(AC coupled)
2.R209
3.R216(75ohm)
Yes
No
Input source fail