LG KG270 Service Manual - Page 72
Speaker Trouble
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4.12 Speaker Trouble TEST POINT Check Points - Speaker spring contact - Audio amp soldering 4. TROUBLE SHOOTING L103 L104 CN101íS 1PIN C117 C118 CN101íS 2PIN C120 CN200 AMP IC R111 CIRCUIT SPEAKER AMPLIFIER C116 NA R103 NA SPK_N C117 0.1u R104 20K SPK_P C118 0.1u R105 20K RADIO_SPK_L C119 0.1u R106 20K R108 82K R102 82K VBAT U100 A3 INP NCP2890AFCT2G OUTB C2 A1 INM OUTA A2 C3 _SD B2 VM C1 BYPASS B3 VP B1 VM_P LOUD_SPK_EN C120 1 uF (2012) C121 0.22u 100K R110 Gain : Rf/Rin (10V,K) diode diode SPEAKER L103 L104 27nH CN101 1 27nH 2 16pi 3.4T speaker (SUSY0025801) D100 C122 C123 0.1u 0.1u D101 - 73 -
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4. TROUBLE SHOOTING
- 73 -
4.12 Speaker Trouble
Check Points
- Speaker spring contact
- Audio amp soldering
TEST POINT
CIRCUIT
SPEAKER
(SUSY0025801)
(2012)
Gain : Rf/Rin
SPEAKER AMPLIFIER
(10V,K)
16pi 3.4T speaker
C118
0.1u
VBAT
0.1u
C119
L103
27nH
R108
82K
R103
NA
C120
1 uF
VP
B3
C3
_SD
27nH
L104
U100
NCP2890AFCT2G
BYPASS
C1
A1
INM
INP
A3
OUTA
A2
C2
OUTB
VM
B2
B1
VM_P
C123
0.1u
0.1u
C117
diode
D101
R102
82K
20K
R105
20K
R106
20K
R104
D100
diode
R110
100K
C122
0.1u
CN101
1
2
C121
0.22u
NA
C116
RADIO_SPK_L
LOUD_SPK_EN
SPK_N
SPK_P
CN200
L103
CN101íS 2PIN
CN101íS 1PIN
L104
AMP IC
C120
C117
C118
R111