Vizio P50HDTV10A Service Manual page 40

PDP N
O SOUND
PDP NO SOUND
Start
Audio power DC power ok?
Yes
Check audio AMP U19 has output?
U32 has output signal?
Check U32 input R372~R379
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No No
Check F2 output has +24V?
No No
Check U19.8 and U19.9
input siganl?
Yes
No
Check Audio AMP U19
has output?
Yes
speaker fail
No No
Appstest 90 1 0x14 0x3540
(Gprobe 5.0)
Is there 1KHz output?
Check U27,U28 output
No No
R326,R328 Digital HD2,AV1
R332,R334 Digital HD1,AV2
R348,R351 Analog HD1,VGA
R356,R358 Analog HD2
Audio power fail
Check C436,C430
Block 3
U32 Fail
Check U27,U28
No
+5V power
Check U29's power
Pin 8,24,4
+5V_SW Pin 8
-5V power
Pin 25
Yes
Yes
Check U29 output
-5V_N pin 5
Check U27,U28 I2C bus
U27 SDA=R344,SCL=R345
U28 SDA=R359,SCL=R360
No
No
U29 fail
No
Check Q35 MSTR2_SCL
Q37 MSTR2_SDA
Check U13
Is there signal?
No
U13 fail
Yes
Q35,Q37 fail
Page 9-21
File No. SG-0219