Vizio Gallevia GV46LHDTV10A, Service Manual

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CONFIDENTIAL – DO NOT COPY Page10- 9
File No. SG-0199
4
Check component 2
(Pb signal) Î C260,R197
Is there sync?
No
Is no blue color on screen?
No
Check U23
outnput Î pin 28
Input Î pin 15
Input clamp voltage
Î
pin 5(+5V)
Output clamp voltage Î pin 29(+5V)
VCC3 Î pin 22,23(+5V)
Input_switch_select Î 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) Î C254,R192
Is there signal?
No
Is no red color on screen?
No
Check U23
outnput Î pin 34
Input Î pin 11
Input clamp voltage Î pin 1(+5V)
Output clamp voltage
Î
pin 35(+5V)
VCC3 Î pin 22,23(+5V)
Input_switch_select
Î
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) Î C287,R212
Is there sync?
No
Is picture on screen?
No
Check U24
outnput Î pin 31
Input
Î
pin 13
Input clamp voltage Î pin 3(+5V)
Output clamp voltage Î pin 32(+5V)
VCC3 Î pin 22,23(+5V)
Input_switch_select Î 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
LCD
LCD
LCD