LG 40LX770H Service Manual page 46

Ethernet HUB(RTL8305N-CG)
Ethernet Power
ETNHUB_DVDD33 ETNHUB_AVDD33
+3.5V_ST_LAN
L8403 L8401
BLM18PG121SN1D BLM18PG121SN1D
C8419 C8425
0.1uF
22uF
16V
10V
ETNHUB_DVDD33
ETNHUB_AVDD33
C8422 C8429
C8426
0.1uF 0.1uF 0.1uF
16V 16V
16V
ETNHUB_AVDD33
IC8400
C8400
MP20045DQ-LF-Z
2.2uF
EP[GND]
25V
R8407
VIN_1 EN 10K
1 8
R8408
VIN_2 PG 100K
2 7
VOUT_1 GND
3 6
R8409
L8406
VOUT_2 FB
10K 1%
4 5
BLM18PG121SN1D
Vout
R2
R8406
R1 C8430
2K
2.2uF
1%
Vout=1.5*(1+R1/R2)
25V
ETNHUB_AVDD18
ETNHUB_DVDD18
C8406 C8410
C8407
0.1uF
0.1uF 0.1uF
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright 2015 LG Electronics Inc. All rights reserved.
Only for training and service purposes
ETNHUB_EPHY_RXIN1
ETNHUB_EPHY_RXIP1
LAN1
ETNHUB_EPHY_TXOP1
ETNHUB_EPHY_TXON1
ETNHUB_EPHY_TXON2
ETNHUB_EPHY_TXOP2
TO PHY Chip
ETNHUB_EPHY_RXIP2
ETNHUB_EPHY_RXIN2
ETNHUB_EPHY_RXIN3
LAN2
ETNHUB_EPHY_RXIP3
C8405 Differential 100 ohm
0.1uF No Via
Close to
16V
ETNHUB_DVDD18 ETNHUB_AVDD18
L8407
BLM18PG121SN1D
C8438
C8435
0.1uF 22uF
16V
10V
OPT
C8411 C8418 C8424
0.1uF 0.1uF
0.1uF
Place Close To RTL8305N
C8440 C8441
15pF 15pF
50V 50V
25.0MHz
X8400
ETNHUB_AVDD18
ETNHUB_AVDD33
R8424 R8423
Place Close To RTL8305N
1.69K 270
1% 1%
1.96K
AVDD18_1 LED_ACT[0]/BCINDROP
1 36
TXON[1] LED_ACT[1]/GYSPD100
2 35
THERMAL
TXOP[1] LED_ACT[2]/P4ANEG
3 34
49
RXIP[1] P4FLCTRL/CPU_INTT R8440
4 33
IC8401
RXIN[1] RESET
5 32
AVDD18_2 DVDD18_4
RTL8305N_REALTEK
6 31
RXIN[2] LED_ACT[3]/EN48PASS1
7 30
RXIP[2] LED_ACT[4]
8 29
TXOP[2] DVDD33
9 28
TXON[2] SDA_MDIO R8434
10 27
TXON[3] SCL_MDC R8435
11 26
TXOP[3] ENEEPROM
12 25
R8436 1K
LAN2
PHY TO RTL matching
TR0P
C8442
0.1uF
TR0N
C8443
0.1uF
TR1P
C8444
0.1uF
TR1N
C8445
0.1uF
Place to center position between two chips
STRAPPING PIN CONFIG
ETNHUB_DVDD18
ETNHUB_DVDD33
LAN_ACT0
GYSPD
LAN_ACT2
100
ETNHUB_INT
Realtek WOL R8452 22
/ETHERNET_RESET
LAN_ACT3
33
EPHY_MDIO
33
EPHY_MDC
ETNHUB_DVDD33
EPHY_MDIO
EPHY_MDC
ETNHUB_AVDD18 L8408-*1
UBW2012-121F
SHENCHEN_NEW
L8408
MAG_NEW
ETNHUB_EPHY_TXOP2
R8416
49.9
C8446
R8417
0.1uF 49.9
ETNHUB_EPHY_TXON2
ETNHUB_EPHY_RXIP2
R8418
49.9
C8447
R8419
0.1uF
49.9
ETNHUB_EPHY_RXIN2
Place close to chip
LX770H
ETHERNET HUB
LAN_ACT0
LAN_ACT2
LAN_ACT3
ETNHUB_ENDEFER
/ETHERNET_RESET
GYSPD
LED_ACT[2]/P4ANEG : Auto-negotiation Enable/Disable
All Strapping Pins are internal pull-up
2015.3.11
18 24
LGE Internal Use Only