LG KE990 Service Manual - Page 109
FB502, FB503
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4. TROUBLE SHOOTING U504 C562 R522 FB502 FB503 C578 R529 R522 C562 C562 0.22u HP_AMP_EN HP_EAR_L R522 15K MIDI_3.3V C565 C566 4.7u 1u C570 1u 17 P_G _SHDN 16 15 INL+ INL_ 14 SVDD1 13 1 PVDD 2 C1P 3 PGND 4 C1N U504 MAX9722BETE U504 OUTL 12 SVSS 11 OUTR 10 SVDD2 9 FB502 FB502 600 FB503 600 PQ 5 PVSS 6 SGND 7 INR+ 8 INR_ R529 15K C578 0.22u C577 1u HP_EAR_R R529 C578 Schematic of voice path C573 PRSB6.8C C574 PRSB6.8C R524 R524 68 R525 68 MIDI_EAR_L MIDI_EAR_R PQ LGE Internal Use Only - 110 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
FB502
FB503
U504
C562
R522
C578
R529
PQ
PQ
4.7u
C565
1u
C566
0.22u
C562
R524
68
5
PVSS
P_G
17
SGND
6
13
SVDD1
9
SVDD2
11
SVSS
16
_SHDN
U504
MAX9722BETE
C1N
4
2
C1P
INL+
15
INL_
14
7
INR+
INR_
8
OUTL
12
OUTR
10
3
PGND
PVDD
1
C577
1u
15K
R529
1u
C570
C574
PRSB6.8C
PRSB6.8C
C573
R525
68
600
FB503
FB502
600
C578
0.22u
R522
15K
MIDI_EAR_L
MIDI_EAR_R
MIDI_3.3V
HP_AMP_EN
HP_EAR_L
HP_EAR_R
Schematic of voice path
FB502
U504
R529
C578
R524
R522
C562