LG CM9540 Service Manual

CIRCUIT VOLTAGE CHART
1. CONNECTORS 2. CAPACITORS
3-73 3-74
Location Value & Spec Voltage_Spec
Play back Standby
positive (+) positive (+)
C102 4.7uF/50V 50V 1.75 2.00
C104 1uF/50V 50V 0.00 0.00
C106 100uF/16V 16V 10.65 10.84
C239 100uF/16V 16V 3.30 3.31
C244 47uF/16V 16V 5.17 5.18
C260 47uF/16V 16V 5.05 5.14
C311 47uF/50V 50V 41.30 41.40
C402 100uF/16V 16V 5.15 5.17
C404 47uF/16V 16V 3.32 3.31
C429 220uF/16V 16V 5.18 5.17
C479 220uF/16V 16V 1.61 1.65
C481 47uF/16V 16V 0.00 0.02
C501 1000uF/6.3V 6.3V 3.08 3.15
C517 47uF/16V 16V 1.23 1.20
C5A9 47uF/16V 16V 1.23 1.20
C643 100uF/16V 16V 5.08 5.17
C700 100uF/16V 16V 0.00 0.00
C707 2200uF/80V 80V 65.80 65.50
C728 2200uF/80V 80V 65.75 65.80
C752 1000uF/80V 80V 65.80 65.50
C798 1000uF/80V 80V 65.75 65.80
C881 100uF/16V 16V 11.82 11.86
Pin No
Location
Pin Name
Spec
(V)
Spec Range
(V)
CABLE
Input
Margin
(V)
CABLE
Output
Margin
(V)
CN106 (MAIN) CN901 (SMPS) CN106 (MAIN)
1 VKK 39 35 ~ 43 40.9 1.90 40.9 1.9
2 FL+ 7.2 na 7.65 0.45 7.65 0.45
3 FL- 2.5 na 2.74 0.24 2.76 0.26
5 -5V -5 -4.8 ~ -5.2 -5.01 -0.01 -5.01 -0.01
7,8,9 +5.6V 5.6 5.2~5.8 5.67 0.07 5.66 0.06
13 +12V 12 11 ~ 13 12 0.00 11.99 -0.01
14 -B -66 -64 ~ -68 -65.8 0.20 -65.8 0.2
15 GATE -54 -52 ~ -56 -53.8 0.20 -53.8 0.2
CN502 CN304(USB) CN103 (MAIN)
2,3 +5.6VA 5.6 5.2~5.8 5.65 0.05 5.65 0.05
CN105 CN301 (Front) CN105 (MAIN)
13 FL- 2.5 na 2.83 0.33 2.78 0.28
19 VKK 39 35 ~ 43 41.3 2.30 40.8 1.8
20 FL+ 7.2 na 7.35 0.15 7.32 0.12
22 3.3V 3.3 3.0~3.6 3.26 -0.04 3.26 -0.04
30 12V 12 11 ~ 13 11.92 -0.08 11.94 -0.06
CN404 (MD) CN404 (MAIN)
1,8,9 VCC 5 4.8~5.2 4.87 -0.13 5.08 0.08
CN110 CN902 (SMPS) CN110 (MAIN)
1,2 -B -66 -64 ~ -68 -65.8 0.20 -65.8 0.20
5,6 +B 66 64 ~ 68 65.5 -0.50 65.5 -0.50
CN504 (BT) CN504 (MAIN)
10 VDD 3.3 3.0~3.6 3.27 -0.03 3.27 -0.03

LG CM9540 Specifications

General

Brand	LG
Model	CM9540
Category	Stereo System
Language	English