Spk 故障 - LG KT878 Service Manual

4.8 SPK 故障
测试点
电路图
VBAT AP_VCC_2V8 AP_VCC_2V8 AP_VCC_2V8
FB806 FB807
BLM15AB601SN1 BLM15AB601SN1
R806 0
FB808
FB809
AP_CLK_POUT
AP_AC97_RESETB
AP_AC97_BITCLK
AP_AC97_SY NC
AP_AC97_SDATAOUT
AP_AC97_SDATAIN
AP_CODEC_IRQ
R822 47
X_P
R823 47
Y _P
R824 47
X_N
R825 47
Y _N
C821 C822
0.01u 0.01u
R804
0
U802
9
DCVDD MIC2A/COMP1/AUX1
1
DBVDD MIC2B/COMP2/AUX2
BLM15AB601SN1 13
TPVDD
BLM15AB601SN1 25
AVDD
43
HPVDD
38
SPKVDD
R812 0 2
MCLKA
3
MCLKB/GPIO6/ADA/MASK
AP_AC801 11
RESETB/GPIO7/PENDOWN
AP_AC802 6
BITCLK
AP_AC803 10
SYNC
AP_AV804 5
SDATAOUT
AP_AC805 8
SDATAIN
AP_AC806 45
GPIO2/IRQ
44
GPIO1/PCMCLK
46
GPIO3/PENDOWN/PCMFS
47
GPIO4/ADA/MASK/PCMDAC
48
GPIO5/SPDIF/PCMADC
14
X+
15
Y +
16
X-
17
Y -
12
WIPER/AUX4/GPIO8/SPDIF
C823 C824
WM9713
0.01u 0.01u
C825 0.01u R828 100K
SPKL
C826 0.01u R829 100K
SPKR
R830 0
AP_SPKAMP_EN
- 112 -
29 C838 1u
HEADPHONE_MIC_CODEC_P
30 TP805
31 TP801
MONO
28 C839 1u
MICPHONE_CODEC_P
MICBIAS
21
MIC1
22 C840 1u
MICCM
23
LINEL
24
LINER
19
PCBEEP
20
MONOIN
33 TP803
OUT4
39
HPL
41
HPR
35
SPKL
36
SPKR
37 TP804
OUT3
27
VREF
32
CAP2
4
DGND1
18
TPGND
26
AGND
42 C818 C819
AGND2
40
HPGND
7 4.7U 4.7U
DGND2
34
SPKGND
VBAT
FB803
BLM18PG121SN1J
U803
D1 B4
IN- VDD1
C4
VDD2
B1
NC
C1 A4 FB804 BLM15AB601SN1
IN+ VO-
A1 D4 FB805 BLM15AB601SN1
_SD VO+
TPA2005D1ZQY R
C827
4.7u
4.故障解决
C811 1u
FM_AUDIO_L
C812 1u
FM_AUDIO_R
C813 1u
HANDPHONE_R
C814 1u
HANDPHONE_L
C815 FB801 BLM15AB601SN1
HP_L
33u
C816 FB802 BLM15AB601SN1
HP_R
33u R816 0
SPKL
R818 0
SPKR
SPK_P
SPK_N