Vizio VP50HDTV10A Service Manual page 81

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
Is picture on screen?
CONFIDENTIAL – DO NOT COPY
No
Check AC power cord
No
Press Meun or Info.
Is there any OSD's logo
No
Check internal cable?
1.LVDS cable.
No
Check internal cable?
1.CN1's cable
2.CN3's cable
D10,D11 LED is lighting?
PDP DISPLAY NOTHING(Analog HD1 without Y signal)
No
Check component 1
(Y signal) C252
Is there sync?
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
Check input source
No No
Check W1 pin 27 is high?
Check U13 pin AD14.
(Display_ON)
No
Check main board CN3 pin 4 studyby +5V
Check CN3 pin 3 RLY_ON(high)
Check CN3 pin 2 VS_ON(high)
No
Check Fuse open?
(F2,F3,F4)
No
Yes
Yes
Yes
No
Yes
U13 fail
No
Trace componect 1 from
Input To U13 circuit
Check R190,R191
No
U13 fail
No
Remove R87.
U13 fail
Is AD14 high?
Yse
Check CN1 pin 1,2,3 = +5V
pin 7,8 = +12V
No
Yes Panel power
fail
Fuse fail
No
Check U3.4 3.3V U3 fail
No
Check U8 1.8V U8 fail
No
Check U9 2.5V U9 fail
No
If power_off high U2,U5 fail
U2,U5 ON
Check +3.3V_SW
,+5V_SW,+12V_SW
(pin 5,6 and pin 7,8)
Block 1
1
Page 9-6
File No. SG-0219