Vizio P50HDTV10A Service Manual page 25

PDP DISPLAY NOTHING(Analog HD1/AC on/off default)
Start
Power LED is lighting?
Yes
Power LED is lighting?
Yes
Power LED is lighting?
Yes
PDP DISPLAY NOTHING(Analog HD1 without Y signal)
Is picture on screen?
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No
Check AC power cord
No Yes
Press Meun or Info. Check input source
Is there any OSD's logo
No
No
Check internal cable? Check W1 pin 27 is high?
1.LVDS cable. (Display_ON)
No
No
Check internal cable? Check main board CN3 pin 4
1.CN1's cable Check CN3 pin 3
2.CN3's cable Check CN3 pin 2
D10,D11 LED is lighting?
No
U13 fail
No No
Check component 1 Trace componect 1 from
(Y signal) C252 Input To U13 circuit
Is there sync? Check R190,R191
Yes
No
Use GProbe connect
from main to PC. U13 fail
Does scaler detect the signal?
No No
Remove R87.
Check U13 pin AD14.
Is AD14 high?
Yse
studyby +5V
Check CN1 pin 1,2,3 = +5V
RLY_ON(high)
VS_ON(high)
No
Yes
Panel power
Check Fuse open?
(F2,F3,F4)
No
Yes No
Check U3.4 3.3V
Yes No
Check U8 1.8V
Yes No
Check U9 2.5V
No
Yes
If power_off high
U2,U5 ON
Check +3.3V_SW
,+5V_SW,+12V_SW
(pin 5,6 and pin 7,8)
U13 fail
pin 7,8 = +12V
No
fail
Fuse fail
U3 fail
U8 fail
U9 fail
U2,U5 fail
Block 1
1
Page 9-6
File No. SG-0219