Vizio P50HDTV10A Service Manual page 37

PDP DISPLAY NOTHING(Digital 2 U35 with PORT B without screen)
BLOCK 1
Is picture on screen?
Is picture on screen?
Is picture color ok?
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No
Check input source?
Yes
No
Check U37 I2C bus
Check U37 power
SCL Pin 6
5V Pin 8
SDA pin 5
Check U35 pin 90 high
No
No
Check +3.3V_SW
V sync R419
FB19,FB20,FB21,FB22
H sync R420
U41 +1.8V_HDMI1
clock R421
No
Check Q44
Check Q44
Gata high(5V)
source high(3.3V)
Yes
No
Check U35 I2C bus
I2C addr. R424
CSDA pin 39
CSCL pin 40
Yes
Yes
Check U35 all power U35 fail
Check U35's RGB data bus
No
B RP10,RP11
G RP12,RP14
R RP16,RP17
No No
Check D66 and D65
Are there 5V output?
Yes
Check crystal
Y2=28.322MHz
Yes
No
Q44 fail
No
Check Block 2
D66 fail
or
D65 fail
14
Page 9-18
File No. SG-0219