LG 50PG60D-SA (CHASSIS:PB82C) Service Manual ▷ View online
- 13 -
No OSD Trouble Shooting (Module Power Sequence)
Normal Display
Vcc
(5V)
Va
Vs
DISPEN
T
VaR
T
VsR
T
On
T
VaF
T
VsF
T
Off
☞
1)
Power_on
3 Sec
Power_off
3 Sec
Min
100ms
Min.
2Frame (Recommend: 2 sec)
msec
500
90
Falling Time of Vs (90% to 10%)
T
VsF
msec
2000
600
Time interval between 90% of Vcc and 90% of Vs
when Power On
T
on
+
T
VsR
msec
800
100
Rising Time of Vs (10% to 90%)
T
VsR
msec
300
50
Falling Time of Va (90% to 10%)
T
VaF
msec
300
10
Rising Time of Va (10% to 90%)
T
VaR
msec
-
20
Time interval between 10% of Vs and 90% of Vcc
when Power Off
T
Off
msec
-
500
Time interval between 90% of Vcc and 10% of Vs
when Power On
T
On
unit
Max.
Min.
Description
Symbol
- 14 -
Module Control Trouble Shooting
Check the PDP Module Control
Board
Replace Module Control Board
N
Y
Check the IIC Tthe II C Test
- Debug Menu IIC Test
Remove R937, R936
Check each IC sharing
IIC channel 2
N
Check P902 SCL,SDA line S CL,SDA
line R937, R936
Check Signal
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
- 15 -
Flash
(32MB)
DDR1(128MB)
(16Mx16x4)
DDR1(128MB)
(16Mx16x4)
TEA6420
Audio
SW
MTV416
(
Micom
Micom
)
NTP3000
(Digital AMP)
64Bit I/F
RGB-PC
HDMI
1/2/3
COMP 1
COMP 2
AV1
AV2
RGB-PC
I2S
MCLK
Digital out
COMP1
COMP2
AV1
AV2
BCM7412
(MPEG4
Decoder)
Analog
/Digital
Tuner
TC90512
DVI
I2S
SIF
SPDIF Out
CVBS
CVBS/Y/C
Y/
Cb
/Cr
R/G/B
DDR1
(32MB)
CS5340
L/R
Serial TP
20bits
12bit
YCbCr
4:2:2
NIM TUNER
TMDS_RX+-
EPM240F
MNT out (Audio Only)
TMDS341A
(3x1,S/W)
CVBS/Y/C
MC33078
(AMP)
L/R
RS232
RX/TX
DVI
Full HD(1080P)
WXGA(768P)
RF
Switch
DM1/DP1
Serial
TP
Video
Front
End
Dual
HDMI
Rx
HD/SD
Video
Encoder
Audio
DSP
USB2.0
PKT
HSX
PCI/
EBI
HD-DVI
IB0
Parse2
RSBUF
XCBUF
RMX0
BCM3553
Local KEY
24C16
74LVC14APW
X-tal(54M)
Reset
KIA7029
NVRAM
I2C
Digital TV Video Trouble Shooting
4:2:2 20bit
YCbCr
- 16 -
Digital TV Video Trouble Shooting
Check RF Cable
Check TP Clock, Data, Sync
R925 (38.1MHz), R804, R803
Maybe Tuner(TU800) has problems
Check BCM3553 Output TP Clock,
Data, Sync
R153, R155, R152
Check BCM7412 Clock,
Hsync
,
Vsync
R1088 (
Typ
. 74.25MHz), R1087, R1086
Y
Y
N
Check Tuner 5V Power
IC810 #3 Pin
Replace IC810
Y
N
Y
Maybe BCM3553(IC100) has problems
N
Maybe BCM7412(IC1000) has problems
N
Check PLD Clock,
Hsync
,
Vsync
R1102 (
Typ. 74.25MHz), R1100, R1101
Y
Redownload
PLD file or replace
N
Maybe BCM3553(IC100) has problems
Y
Check D805 color
Bad Tuner. Replace Tuner.
None
red
Check BCM7412 Input Clock
R107 (27MHz)
Replace it
N
Y
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