Vizio VP50HDTV10A, Service Manual

Page: 85 / 102

CONFIDENTIAL – DO NOT COPY
Page 9-
10
File No. SG-0219
5
Check component 2
(Pb signal) Î C288,R213
Is there sync?
No
Is no blue color on screen?
No
Check U24
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
U10 fail
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Pb signal)
BLOCK 1
U24 fail
No
Check before U24’s circuit
1.C289,C290(AC coupled)
2.R211
3.R217(75ohm)
Yes
No
Input source fail
Check component 2
(Pr signal) Î C284,R210
Is there signal?
No
Is no red color on screen?
No
Check U24
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
U10 fail
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Pr signal)
BLOCK 1
U24 fail
No
Check before U24’s circuit
1.C276,C281(AC coupled)
2.R215
3.R218(75ohm)
Yes
No
Input source fail
Check U45
H sync output Î U45 pin4,R181
V sync output Î U45 pin8,R184
Is there signal?
No
Is picture on screen?
No Check U45
H sync input Î U45 pin1,R185
V sync input Î U45 pin5,R187
Check U22’s signal output
R signal Î C238,R180,R169,U22.34
G signal Î C237,R177,R171,U22.31
B signal Î C235,R174,R176,U22.28
Yes
No
Check U22 input signal
R Î pin 2, C239;C241(AC coupled),R186,R172(75ohm)
G Î Pin 4,C234;C236(AC coupled),R166,R175(75ohm)
B Î Pin 6,C221;C224(AC coupled),R164,R173(75ohm)
PDP DISPLAY NOTHING(RGB)
BLOCK 1
Check U45
pin 14 Î +3.3V
Yes
Check input source
No
U45 fail
Yes
Check U22
Input clamp voltage Î pin 1(+5V_V1)
Output clamp voltage Î pin 35(+5V)
VCC3
Î
pin 22,23(+5V)
Input_switch_select Î low (0V)
Yes
U22 fail
No