LG 42PT250E-DA / 42PT260E-DC (CHASSIS:PB11K) Service Manual ▷ View online
Customer Oriented R&D
Breakthrough
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7
S7
WXGA/XGA
LVDS
(Front-end)
(External Input)
EXT_IN
HDMI_D
CVBS_LIVE
TP1
CVBS_LIVE
SIF1
SIF1
Cab
le
ISDB-T/
PAL/NTSC
(System + Scalar)
IF
I2S_BCM
TAS9709
TAS9709
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
NANDFlash
256MB
NANDFlash
256MB
(Audio Out)
USB2.0
SPDIF
SIF_LIVE
I2S_BCM
(Comp1/2, RGB)
HDMI_Rear(D port)
HDMI_Side (C port)
SIDE HDMI_PORT
UI_HW_PORT1
HDMI_C
Demodulator
MN884433
TP1
Serial_Flash
1MB
Serial_Flash
1MB
(USB)
Rear USB( SVC only PJ230)
Side USB
1. Power-Up Boot Fail Trouble Shooting
Reset
HDMI CEC (Stand-by)
IR
I2C
KIA7427AF
KIA7427AF
24C16
24C16
Local
Local
KEY
KEY
NEC
NEC
Micom
Micom
(Micom)
Rear(0)
Side(1)
Customer Oriented R&D
Breakthrough
1. Power-Up Boot Fail Trouble Shooting
Replace Power board
N
Y
Check Micom Redownload or
replace
Check P500 All Voltage Level
(17V, 5V, 3.5/5V_ST)
Check Power connector
Y
Check Voltage Level 3.3V at IC504,
R124(Micom)
N
If Q501 Output is normal,
Replace of the IC504
& Recheck
Y
N
Check Voltage Level 1.26V at C534
N
Check R527 voltage level
(3.3V RL_ON)
Replace one of IC501 & Recheck
N
Y
Check Voltage Level 1.5V
at IC502 #7 pin
N
Check R500 voltage level
(ON/OFF Control)
Replace one of IC502 & Recheck
N
Y
Check Voltage Level 2.5V at C589
N
Replace one of IC505 and application
circuit & Recheck
N
Y
Check X200 Clock24MHz
N
Replace X200
Y
Check signal transition
at IC103
N
Maybe Serial Flash Memory
problem
Check signal transition
IC104
Y
Check All Voltage Level
at Bead, RL_ON, IC500 output
N
Replace one of Bead, IC500
& Recheck
Y
N
Maybe NAND Flash Memory or S7
have troubles
Y
Check DDR Memory
/Replace one
Check S7 Main chip and Soc_Reset
Signal from micom GPIO
N
N
N
Customer Oriented R&D
Breakthrough
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7
S7
WXGA/XGA
LVDS
(Front-end)
(External Input)
EXT_IN
HDMI_D
CVBS_LIVE
TP1
CVBS_LIVE
SIF1
SIF1
Cab
le
ISDB-T/
PAL/NTSC
(System + Scalar)
IF
I2S_BCM
TAS9709
TAS9709
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
NANDFlash
256MB
NANDFlash
256MB
(Audio Out)
USB2.0
SPDIF
SIF_LIVE
I2S_BCM
(Comp1/2, RGB)
HDMI_Rear(D port)
HDMI_Side (C port)
SIDE HDMI_PORT
UI_HW_PORT1
HDMI_C
Demodulator
MN884433
TP1
Serial_Flash
1MB
Serial_Flash
1MB
(USB)
Rear USB( SVC only PJ230)
Side USB
Reset
HDMI CEC (Stand-by)
IR
I2C
KIA7427AF
KIA7427AF
24C16
24C16
Local
Local
KEY
KEY
NEC
NEC
Micom
Micom
(Micom)
Rear(0)
Side(1)
2. No OSD Trouble Shooting
Customer Oriented R&D
Breakthrough
2. No OSD Trouble Shooting
Replace Power board
N
Y
Check 5V Voltage Level
at P500
Check Power connector
Y
Check 5V Voltage Level at Q501
N
Replace one of Q501
& Recheck
Y
Check P903
(TXAC-), (TXAC+), (TXBC-),
(TXBC+), Display Enable
N
Y
Check LVDS Cable
N
Replace Cable
Y
Check PDP Module
Check 5V Voltage Level
at L507, L501
N
Replace one of L507,501
& Recheck
Y
Maybe S7(IC101)
has troubles
It should satisfy the
Pixel Clock
on CAS.
Electrical Specifications
Power Supply Sequence
Input Signal Timing Specification
Control Signal Register
Power Supply Sequence
Input Signal Timing Specification
Control Signal Register
Check CAS
Check P500
5V_ON
Check GPIO Path of Micom
N
Y
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