Vizio P50HDM Service Manual - Page 65

PDP DISPLAY NOTHINGAnalog HD1/AC on/off default - powers up no screen

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PDP DISPLAY NOTHING(Analog HD1/AC on/off default) Start No Power LED is lighting? Check AC power cord Yes No Power LED is lighting? Yes Press Meun or Info. Is there any OSD's logo No Check input source Check internal cable? 1.LVDS cable. No No Check W1 pin 27 is high? (Display_ON) Remove R87. Check U13 pin AD14. Is AD14 high? No U13 fail Yes No Power LED is lighting? Check internal cable? 1.CN1's cable 2.CN3's cable No Check main board CN3 pin 4Î studyby +5V Check CN3 pin 3Î RLY_ON(high) Check CN3 pin 2Î VS_ON(high) No Check Fuse open? (F2,F3,F4) Yse Check CN1Îpin 1,2,3 = +5V pin 7,8 = +12V No Yes Panel power fail No Fuse fail D10,D11 LED is lighting? Yes No Check U3.4Î3.3V U3 fail Yes No Check U8Î1.8V U8 fail Yes Yes No Check U9Î2.5V U9 fail No U13 fail No Yes If power_off Îhigh U2,U5Î ON Check +3.3V_SW ,+5V_SW,+12V_SW (pin 5,6 and pin 7,8) PDP DISPLAY NOTHING(Analog HD1 without Y signal) U2,U5 fail Block 1 No Is picture on screen? Check component 1 No (Y signal) ÎC252 Is there sync? Trace componect 1 from Input To U13 circuit Check R190,R191 Yes 1 Use GProbe connect No from main to PC. Does scaler detect the signal? U13 fail CONFIDENTIAL - DO NOT COPY Page10-5 File No. SG-0174

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CONFIDENTIAL – DO NOT COPY
Page10-
5
File No. SG-0174
1
PDP DISPLAY NOTHING(Analog HD1/AC on/off default)
Power LED is lighting?
Start
No
Yes
Check AC power cord
No
Press Meun or Info.
Is there any OSD’s logo
Power LED is lighting?
No
Check U3.4
3.3V
No
D10,D11 LED is lighting?
Check internal cable?
1.LVDS cable.
Panel power
fail
U3 fail
Check U8
1.8V
Check U9
2.5V
No
U8 fail
No
U9 fail
If power_off
high
U2,U5
ON
Check +3.3V_SW
,+5V_SW,+12V_SW
(pin 5,6 and pin 7,8)
No
U2,U5 fail
Check Fuse open?
(F2,F3,F4)
Fuse fail
Yes
No
Yes
U13 fail
No
Yes
Check input source
Check internal cable?
1.CN1’s cable
2.CN3’s cable
No
Check main board CN3 pin 4
studyby +5V
Check CN3 pin 3
RLY_ON(high)
Check CN3 pin 2
VS_ON(high)
Yse
Check CN1
pin 1,2,3 = +5V
pin 7,8 = +12V
No
No
Yes
No
Power LED is lighting?
No
Check W1 pin 27 is high?
(Display_ON)
No
Remove R87.
Check U13 pin AD14.
Is AD14 high?
U13 fail
No
Yes
Yes
Yes
Check component 1
(Y signal)
C252
Is there sync?
No
Is picture on screen?
Yes
Block 1
No
Trace componect 1 from
Input To U13 circuit
Check R190,R191
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD1 without Y signal)