LG 50PT250B-SG (CHASSIS:PB12K) Service Manual ▷ View online
2. No OSD Trouble Shooting
Replace Power board
N
Y
Check 5V Voltage Level
at P501
Check Power connector
Y
Check 5V Voltage Level at L507
N
Replace one of L507
& Recheck
Y
Check P1401/P1402
(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 S7LR(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 P501
5V_ON
Check GPIO Path of PM
N
Y
Check 3D ASIC
*3D Trouble Shooting
No OSD Trouble Shooting (Module Power Sequence)
msec
-
2000
Time interval between 10% of Vcc and 90% of Vcc
when Power On
T
OnR
msec
500
90
Falling Time of Vs (90% to 10%)
T
VsF
msec
-
3100
Time interval between 90% of Vs
and DISPEN rising edge when Power On
T
d_on
msec
6000
1500
Time interval between DISPEN falling edge
and 90% of Vs when Power Off
T
d_off
Recommended 2sec
msec
300
10
Rising Time of Va (10% to 90%)
T
VaR
msec
400
100
Rising Time of Vs (10% to 90%)
T
VsR
msec
500
50
Falling Time of Va (90% to 10%)
T
VaF
msec
-
20
Time interval between 10% of Vs and 90% of Vcc
when Power Off
T
Off
msec
1250
750
Time interval between 90% of Vcc and 10% of Vs
when Power On
T
On
unit
Max.
Min.
Description
Symbol
T
d_on
T
d_off
Normal Display
Vcc
(5V)
Va
Vs
DISPEN
T
VaR
T
VsR
T
On
T
VaF
T
VsF
T
Off
T
OnR
Module Control Trouble Shooting
“TILT” on Adjust Remocon
: PDP internal pattern displays?
PDP Module Power is OK?
N
PDP Module is OK.
Check SCL,SDA line
Check Signal
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 >
SCL
SDA
ACK
signal Check
Low :
OK
High :
Error
Replace Control
Board
N
Check SMPS & cable
N
Y
Replace PDP Module
(Front-end)
(External Input)
(System + Scalar)
I2S_S7LR
STA368
STA368
(Audio Out)
(USB)
3. Digital TV Video Trouble Shooting
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7LR
S7LR
HD
LVDS
NANDFlash
128MB
NANDFlash
128MB
SPDIF
I2S_S7LR
Serial_Flash
1MB
Serial_Flash
1MB
EXT_IN
HDMI 1
CVBS
TP
SIF
HDMI 2
HDMI 3
USB2.0
Side USB
Side USB
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
(Comp1/2, RGB)
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
REAR HDMI_PORT
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