LG 50PK950-SA (CHASSIS:PB01A) Service Manual ▷ View online
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 all multi voltage
(1.2v, 3.3v, 1.8v)
N
Check power up boot sequence
Y
Check P202
(TXAC-), (TXAC+), (TXBC-),
(TXBC+)
N
Y
Check LVDS Cable
N
Replace Cable
Y
Check PDP Module
Check 5V Voltage Level
at L501
N
Replace one of L501
& Recheck
Y
Maybe BCM3556(IC100)
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 P202 DISP_EN
Check GPIO Path of Micom
N
Y
Customer Oriented R&D
Breakthrough
No OSD Trouble Shooting (Module Power Sequence)
Customer Oriented R&D
Breakthrough
Module Control Trouble Shooting
“TILT” on Adjust Remocon
: PDP internal pattern displays?
PDP Module Power is OK?
N
PDP Module is OK.
Check P202 SCL,SDA line SCL,SDA
line R244, R252
Check Signal
: X1 output
N
Y
SCL (continue)
SDA (continue)
ACK
By Slave
9
1
D0
D7
9
ACK
By Slave
Command Data
for Addr
Stop
By Master
D6
SCL
8
SDA
0
0
1
1
1
A7
W
Start
By
Master
Chip ID Address Byte
(0x1C)
ACK
By Slave
0
1
9
1
A6
A1
A0
Command Address
Addr=A[7:0]
0
Write
only
Master : Image Board
Slave : PDP Module
Slave : PDP Module
< Sample Signal on R244, R252 >
SCL
SDA
ACK
signal Check
Low :
OK
High :
Error
Replace X1
N
Check SMPS & cable
N
Y
Replace PDP Module
Customer Oriented R&D
Breakthrough
3. Digital TV Video Trouble Shooting
DDR2
512MB(128*4)
DDR2
512MB(128*4)
BCM3556
(400M MIPS)
BCM3556
(400M MIPS)
1080P
LVDS
(Front-end)
(External Input)
EXT_IN
HDMI0_BCM
CVBS_LIVE
TP1
CVBS_LIVE
SIF1
SIF1
Cab
le
ISDB-T/
PAL/NTSC
(System + DVR + Scalar)
IF
I2S_BCM
TAS9709
TAS9709
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
HDMI0_BCM
AV2
AV2_LR
NANDFlash
512MB
NANDFlash
512MB
(Audio Out)
USB2.0
SPDIF
SIF_LIVE
I2S_BCM
TDA9996
TDA9996
(Comp1/2, RGB)
HDMI3
HDMI1
HDMI2
SIDE HDMI_PORT
UI_HW_PORT1
UI_HW_PORT2
LAN
HUB
(PK950)
PK550
BT Module
PK950
(USB)
Demodulator
MN884433
TP1
HDMI2
UI_HW_PORT3
LAN
(LAN)
HDMI
(Wireless)
Wireless
RX Box
PHY
PHY
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