Harman Kardon ONYX STUDIO 4 - LED Indicator Status; Understanding LED Behaviour

7-2
Circuit Diagram:Main board & CN board
POWER_ON/OFF_DAC 7
BATTERY BOOST 3.7V TO 11V
BAT
3.3-4.2V
DC_IN_19V
L1
6.8uH/10A
FB2 300/3A SK56/60V/5A
C1 NC/100nF/25V/X5R
FB1 300/3A
D1
Vout_11V
R1
10
+
C4 C5
BAT
R2 2.2 C7 1000pF/50V/X7R
3
D2 2
1
Vout_11V
TP1
AMP Switch
TP2
1
S1 D1
8
U1
2
S3 D2
7
AMP_11V_19V
C11
3
S2 D3
6
+
C10
R5
39K/1%
R3
SVM1045V
NC/56
CE2
220uF/25V/SMD 100nF/25V/X5R
4
G1 D4
5
AP4435GM
C12
C13
LM_ISENB
U2
1
ISEN
2
UVLO
Q1
AP92U03GM-HF
VIN
10
VCC
9
C14 470nF
C15
3
8
R6 0
NC/330pF/50V/NP0
R8
NC/30K/1%
BOOST_FB
COMP
DR
the line short as far as possible
4
FB
FGND
7
TP3
5
AGND FA/SYNC/SD
6 R13
82K/1%
LM3481
BAT
R10
R18 R15
100 LM_ISENB
Q2
R16
10K AMP_PWR_CTRL
C19
NPN_3DG3904M
AMP_PWR_CTRL 7
R17
2.2K
R14 1M/1%
R19
100K
C20
0.1uF/16V/X7R
TP4
Power_ON R23 1K
N_2SK3018
Q3
0.02Ω/1%
0.02Ω/1%
2200pF/50V/X7R
DC_IN_19V
R77
NC/300K
NC/NPN_3DG3904M
Q18
G
R25
100K
C22
2.2UF
Vout_11V
DC_Bias 8
POWER ON/OFF Circuit
Vout_11V
Q4 P_AP2309
S D
VSYS
TP5
R26 NC/0
SYS_3V3
TP6
TP7
VDD_3V3
L2
C23
100nF/25V/X5R
10uH/1.6A
Q5 PNP_MMBT8550CLT1
R32
C35
U3
SY8213
8
PVIN
7
SVIN
3
EN
C30 C31 C32 C33
R31
R33
1K
C34
LX
FB
2
5
10UF/6.3V/X5R 0.1uF/16V/X7R
10K
10UF/6.3V/X5R
0.1uF/16V/X7R
100K
R34
47K
GND
9
R35
22K/1%
R36
1K
R37 100K
Power_ON
8
C36
R38
47K
Q7
R39 4.7K POWER_ON/OFF_DAC
Q6
R41 680K
DC_IN_19V
R42
100K
Power For Logic
CHR_4V7
BAT
D3
1N4148WS
STB_3V3
D4
1
C42
MBRX140/40V/1A
U4
6213
VIN VOUT
5
C43
2
GND
C44
C46
C119
C45
3
R337 10K
EN
BP
0.1uF/16V/X7R
4
R40 47K
C41 0..1uF/16V/X7R
NPN_3DG3904M
NC//22uF/10V/X5R
100nF/25V/X5R
NC//0.1uF/50V/X7R
C29 4700pF/50V/X7R
R30 100K/1%
0.1uF/50V/X7R
C38 0..1uF/50V/X7R
R4 100K R7 47K
C37 1uF/10V/X5R
R29 10 1µF/50V/X7R
1uF/10V/X5R
C28 100nF/25V/X5R
C9 4.7uF/25V/X5R
C27 0..1uF/50V/X7R
C8 4.7uF/25V/X5R
C26 22uF/25V/X5R
C21 0..1uF/16V/X7R
C6 0.1uF/16V/X7R
10UF/6.3V/X5R
R75 NC/20K
10UF/6.3V/X5R
C118 NC//0.1uF/16V/X7R
CE1 220uF/6.3V/SMD
C25 NC//100nF/25V/X5R
C3 100nF/25V/X5R
C18 NC//5600pF/50V/X7R
R315
120K/1%
C2 1µF/50V/X7R
R12
120K/1%
R316
18.7K
R11 10K/1%
R21
10K/1%
C40 0..1uF/16V/X7R
R9
120K/1% R20
10K/1%
R28 1M
NPN_3DG3904M
C39 1UF/16V/X7R
C17 100nF/25V/KBX
C24 100nF/25V/X5R
C16
6800pF/50V/X7R
R24 51/1%
G
S
D
4
G
D
5
3
S
D
6
2
S
D
7
1
S
D
8
10uF/25V/X5R
100nF/25V/X5R
6
VCC
10UF/6.3V/X5R
4
1
SS
BS
0.1uF/16V/X7R
100pF/50V/NP0