LG 42LY750H Service Manual page 40

Ethernet HUB(RTL8305N-CG)
Ethernet Power
+3.5V_ST
ETNHUB_DVDD33 ETNHUB_AVDD33
FET_ROHM
Q8400
L8403 L8401
RSR025P03
BLM18PG121SN1D BLM18PG121SN1D
C8419 C8425
C8401 OPT 0.1uF 22uF
0.1uF R8404 R8405 16V
10V
16V 10K 10K
+3.5V_ST
R8487
C
10K
R8486
Q8401 B
ETNHUB_PWR_ON/OFF
2SC3052
10K
E
ETNHUB_AVDD33
ETNHUB_DVDD33
C8416 C8422 C8429 C8402
C8426
OPT 22uF 0.1uF 22uF
0.1uF 0.1uF OPT
10V 10V
IC8400
MP20045DQ-LF-Z
ETNHUB_AVDD33
EP[GND]
R8407
VIN_1 EN 10K
1 8
C8400
R8408
2.2uF
VIN_2 PG
100K
25V 2 7
VOUT_1 GND
3 6
R8409
VOUT_2 FB 10K
4 5
Vout
R2
R8406
R1 C8430
2K
2.2uF
Vout=1.5*(1+R1/R2)
25V
ETNHUB_DVDD18
C8403 C8406 C8410 C8417 C8423
OPT 22uF 0.1uF 0.1uF
0.1uF 0.1uF
10V
ETNHUB_AVDD18
C8404 C8407 C8411 C8418 C8424 C8427
OPT
22uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF
10V
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 ⓒ 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
FET_2.5V_AOS FET_2.5V_NXP
Q8400-*2
Q8400-*1
PMV48XP
AO3435
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
ETNHUB_DVDD18 ETNHUB_AVDD18
L8406 L8407
BLM18PG121SN1D
BLM18PG121SN1D
C8438
C8435
0.1uF 22uF
16V
10V
OPT
MTK TO RTL matching
EPHY_RDP
EPHY_RDN
C8432 C8433 C8436 EPHY_TDP
0.1uF 0.1uF 0.1uF
EPHY_TDN
SOC
Place Close To RTL8305N
C8440 C8441
27pF 27pF
50V 50V
X8400
25MHz
R8415 1M
OPT
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 49 34
RXIP[1] P4FLCTRL/CPU_INTT
4 33
IC8401
RXIN[1] RESET
5 32
AVDD18_2 RTL8305N_REALTEK DVDD18_4
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
10 27
TXON[3] SCL_MDC
11 26
TXOP[3] ENEEPROM
12 25
R8436 1K
LAN2
L8404-*1
PHY TO RTL matching
UBW2012-121F
ETNHUB_AVDD18
SHENCHEN_NEW
MAG_NEW
MLB-201209-0120P-N2
L8404
MLB-201209-0120P-N2
ETNHUB_EPHY_TXOP0
C8412
TR0P
0.1uF R8411
49.9
1%
C8420 R8412
49.9
0.1uF
1%
ETNHUB_EPHY_TXON0
C8413 TR0N
0.1uF
ETNHUB_EPHY_RXIP0
C8414
R8413 TR1P
0.1uF
49.9
1%
C8421
R8414
0.1uF
49.9
1%
ETNHUB_EPHY_RXIN0
C8415
TR1N
0.1uF
Place close to chip
Place to center position between two chips
Place to center position between two chips
STRAPPING PIN CONFIG
ETNHUB_ENDEFER
/ETHERNET_RESET
ETNHUB_DVDD18
ETNHUB_DVDD33
LAN_ACT0
GYSPD
LAN_ACT2
R8440 100
ETNHUB_INT
Realtek WOL
/ETHERNET_RESET
LAN_ACT3
R8434 33 LED_ACT[2]/P4ANEG : Auto-negotiation Enable/Disable
ETHERNET_MDIO
R8435 33
ETHERNET_MDC
L8408-*1
UBW2012-121F
ETNHUB_AVDD18
SHENCHEN_NEW
MAG_NEW
L8408
ETNHUB_EPHY_TXOP2
C8442
0.1uF R8416
49.9
C8446 R8417
49.9
0.1uF
ETNHUB_EPHY_TXON2
C8443
0.1uF
ETNHUB_EPHY_RXIP2
C8444
R8418
0.1uF
49.9
C8447
R8419
0.1uF
49.9
ETNHUB_EPHY_RXIN2
C8445
0.1uF
Place close to chip
xxLY750H-UA
Ethernet Hub
LAN_ACT0
LAN_ACT2
LAN_ACT3
GYSPD
All Strapping Pins are internal pull-up
ETNHUB_DVDD33
ETHERNET_MDC
ETHERNET_MDIO
2013.12.24
15 21
LGE Internal Use Only