MiTAC 8355 service manual Output Of Audio Subsystem

8355 N/B MAINTENANCE

8.15 Audio Failure

Symptom:

No sound from speaker after audio driver is installed.

R765 15K

Output Of Audio Subsystem R764 20K

R735

15K

J4

R734

20K

R

Internal

Speaker

P13

P21

22

ROUT+

L505

1

P20

L506

15

ROUT-

2

AC97_RST#

C823

R771

U518

AC97_SDOUT

36

10U

C392

2.2U

12.1K

20

AOUT_R

J5

AC’97

5

R770

21

AC97_SDIN0

C806

0.1U

L

Internal

4

7

12.1K

VR1

U20

CODEC

6

U517

Speaker

AC97_SYINC

1

3

L509

C816

2

R730

3

LOUT+

1

ALC202

South

AC97_BITCLK

35

10U

C810

4.7U

12.1K

5

L508

AOUT_L

10

LOUT-

2

R729

Bridge

SPDIFOUT

12.1K

AMPLIFIER

+AMP_5V C365

C370

+AMP_5V

C749

0.1U

4

VT8235

R781

TPA0202

100U

100U

J17

L534

0

R748

120Z/100M

Head Phone

+5VS

7

15K

L78

+3V

18

SE/BTL#

16

L537

600Z/100M

Q528

DEVICE

5

+AMP_5V

DTA144WK

HP/LINE# 14

3

_DECT#

GNT_Code

L82

4

1

3

C383

C804

C757

C797

2

R311

22

L76

2

100U

0.1U

0.1U

R752

R749

C783

0.1U 1

Q529

R314

22

L81

3

10K

1U

DTC144TKA

SPKR_MUTE#

4.7K

GNT_Code

L536

1

3

2

DECT_HP#/OPT

2

R312

R313

8

LED

Drive

3

DECT_HP#/OPT

1K

1K

7

1

Q26

Q27

9

IC

R859

2

0

DTC144TKA

DTC144TKA

L80

L78

1

DEVICE_DECT#

600Z/100M

600Z/100M

156