Vizio P50HDTV10A, Service Manual

Page: 40 / 44

CONFIDENTIAL – DO NOT COPY Page 9- 21
File No. SG-0219
PDP N
O SOUND
PDP NO SOUND
Start
No
Yes
Check Audio AMP U19
has output?
Check U19.8 and U19.9
input siganl?
No
Check C436,C430
Audio power DC power ok?
No
Check F2 output has +24V?
No
Audio power fail
Block 3
Check audio AMP U19 has output?
No
speaker fail
Yes
U32 has output signal?
Yes
No
Appstest 90 1 0x14 0x3540
(Gprobe 5.0)
Is there 1KHz output?
No
U32 Fail
Check U32 input Î R372~R379
No
Check U27,U28 output
R326,R328 Î Digital HD2,AV1
R332,R334 Î Digital HD1,AV2
R348,R351 Î Analog HD1,VGA
R356,R358 Î Analog HD2
No
Check U27,U28 I2C bus
U27 Î SDA=R344,SCL=R345
U28 Î SDA=R359,SCL=R360
Check U27,U28
+5V power Î
Pin 8,24,4
-5V power Î
Pin 25
No
Check U29’s power
+5V_SW Î Pin 8
Yes
Check U29 output
-5V_N Î pin 5
No
U29 fail
Yes
No
Check Q35 Î MSTR2_SCL
Q37 Î MSTR2_SDA
Is there signal?
No
Check U13
Yes
Q35,Q37 fail
No
U13 fail
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