LG 55LD650H (CHASSIS:LA05A) Service Manual ▷ View online
LD650H Power Diagram (4) : +3.3V
+3.3V
DCDC
enable
Regulator
FET
Bead
IC1501 : External VDEC 3.3V (9mA)
L1810
L201
L200
L706
L800
JK300 : SPDIF
IC901 : Flash Memory (15mA)
24mA
TU1800 : b-LAN 3.3V
70mA
IC200 : HDMI repeater
IC201 : HDMI repeater
IC900 : main EEPROM (3mA)
IC601 : VTT Regulator (209mA)
IC601 : VTT Regulator (209mA)
212mA
P703 : IR board
IC800 : Pro:idiom
L310
IC301 : NTP3100L 3.3V
+3.3V_PROIDIOM
60mA
100mA
0.85mA
L110
+3.3V_TU
L111
IC101
AP1117EG, 3A
+1.26V_TU
L112
TU100 : AV tuner 3.3V
TU100 : AV tuner 1.2V
60mA
L101
L109
L1200
L1000
+3.3V_DVDD_PDMOD
+3.3V BCM3549P
+3.3V_AVDD_PDMOD
+A3.3V
BCM3549P
BCM3549P
3mA
31mA
230mA
IC102 : Demodulator Digital 3.3V
IC102 : Demodulator Analog 3.3V
IC100 : BCM3549 Digital 3.3V
IC100 : BCM3549 Analog 3.3V
IIC block diagram
BCM3549
SGPIO0 : N25
SGPIO1 : N26
SGPIO1 : N26
SGPIO2 : N24
SGPIO3 : N23
SGPIO3 : N23
SGPIO4 : J2
SGPIO5 : J1
SGPIO5 : J1
SGPIO6 : K3
SGPIO7 : K2
SGPIO7 : K2
CXA2040
Video switch
IC1500
VSB chip
LGDT3305
IC102
SCL0_5V
SDA0_5V
SDA0_5V
SCL1_5V
SDA1_5V
SDA1_5V
SCL2_3.3V
SDA2_3.3V
SDA2_3.3V
SCL3_3.3V
SDA3_3.3V
SDA3_3.3V
Bright Sensor
D23
F24
GPIO_IIC_SCL
GPIO_IIC_SDA
GPIO_IIC_SDA
PTC
IC501
EEPROM
NVRAM
IC502
R
5V
R
3.3V
R
R
D3.3V
R
R
R
D3.3V
R
R
5V
R
R
R
ST_5V
4.7K
4.7K
4.7K
4.7K
4.7K
22Ω
100Ω
22Ω
22Ω
0Ω
0Ω
4.7K
R
Bright Sensor
M24512
IC900
NVRAM
Level
shifter
shifter
R
5V
4.7K
NTP3100
IC301
Audio AMP
LGDT1129
IC800
Pro:idiom
Techwell
IC1501
Video Dec
R
22Ω
R
100Ω
R
22Ω
EEPROM
EDID
IC1700
UART block diagram
BCM3549
PTC
RXD0-41
TXD0-42
TXD0-42
RXD0-43
TXD0-44
TXD0-44
GPIO31-P25
GPIO30-P26
GPIO16-P24
GPIO15-P23
GPIO15-P23
FOR MPI
PTC_DEBUG_RX
PTC_DEBUG_TX
12
R1OUT
R1OUT
13
R1IN
R1IN
11
T1IN
T1IN
14
T1OUT
T1OUT
FOR Initial Download
PTC_RX_5V
PTC_TX
PTC_TX_BCM
BCM_RX
BCM_TX
PTC_RX_MNT
PTC_TX_MNT
FOR
BCM Debuging
and
PTC Download / Debugging
and
Monitoring
BCM Debuging
and
PTC Download / Debugging
and
Monitoring
Download/debugging
Communication
PTC_RX_BCM_3.3V
buffer
buffer
UART_SWA
Communication
Debugging
TXD2-3
RXD2-2
MODC/TAGHI/BKGD
D
C
1
0
1
0
0
1
0
1
Level
shifter
shifter
opt
PC_SIMUL
PTC_TX_1
PTC_RX_BCM_5V
UART_SWA
UART_SWB
UART
_SWB
Power-Up Boot Fail Trouble Shooting guide
Check P400 All
Voltage Level (3.5V, 12V, 24V)
Check power connector and
RL_ON signal OK ?
Replace Power board
Y
N
Y
Check IC501 RESET and
UPDATE pin
Check switch SW500, SW501
Y
N
Check X500 Clock
7.37MHz
Check X500 application circuit
or Replace X500
Y
N
Check IC502 IIC
communication state
Check IIC line or replace
IC501
N
Check IR input state of IC501
23pin
Check IR board
N
Y
Re-download PTC Micom
Y
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