Vizio P50HDTV10A, Service Manual

Page: 27 / 44

CONFIDENTIAL – DO NOT COPY Page 9- 8
File No. SG-0219
3
Check component 1
(Pr signal)
Î C255
Is there sync?
No
Is picture on screen?
No
Trace componect 1 from
Input To U10 circuit
Check R205,R204
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U10 fail
BLOCK 1
PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Pr signal)
Check component 1
(Pb signal) Î C255
Is there sync?
No
Is picture on screen?
No
Trace componect 1 from
Input To U10 circuit
Check R200,R198
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U10 fail
BLOCK 1
PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Pb signal)
Check component 2
(Y signal) Î C258,R195
Is there sync?
No
Is picture on screen?
No
Check U23
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
U13 fail
PDP DISPLAY NOTHING(Analog HD2 without Y signal)
BLOCK 1
U23 fail
No
Check before U23’s circuit
1.C263,C265(AC coupled)
2.R209
3.R216(75ohm)
Yes
No
Input source fail
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