LG 50PV490-UC (CHASSIS:PU11L) Service Manual ▷ View online
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
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7
S7
FHD
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_S7R
STA368
STA368
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_S7R
(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 )
Side USB
Rear(0)
Side(1)
3. Digital TV Video Trouble Shooting
3. Digital TV Video Trouble Shooting
Check RF Cable
Y
Check TP Clock, Data, Sync
R630, R631, R632 , R633
N
Maybe Demodulator has problems
Y
Maybe MstarS7R(IC101)
has problems
Check Tuner(TU1300) Power
(5.0V, 3.3V, 1.2V)
N
Replace one of Bead
& Recheck
Y
Check IF Signal pin #17, 18
N
Maybe Tuner has problems
Y
Check Demodulator Power
(*Brazil Model only)
(3.3V, 1.2V) L609, IC600
N
Replace L609 / IC600
Y
Check Demodulator X-TAL
(X602)
N
Replace X-TAL
Y
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