LG 26LG40 (CHASSIS:LA89D) Service Manual ▷ View online
- 17 -
3. No OSD (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
- 18 -
4. Module Control
Check the PDP Module Control
Board
Replace Module Control Board
N
Y
Check the IIC To II C Test
- Debug Menu IIC Test
Remove R330, R334
Check each IC sharing
IIC channel
N
Check P302 SCL,SDA line S
CL,SDA
line R330, R334
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
Slave : PDP Module
- 19 -
5. Digital TV Video
Check RF Cable
Check TP Clock, Data, Sync
R440, R441, R442
Maybe Tuner(TU400) has problems
Check Mstar LVDS output
#33(TXAC-) , #32(TXAC+) ,
#17(TXBC-) , #16(TXBC+)
Y
N
Check Tuner 5V Power
IC703 #5 Pin
Replace IC703
Y
N
Y
Replace
Mstar(IC100) has problems
N
Y
Check LD400 color
Bad Tuner. Replace Tuner.
None
Yellow ‡ none
Check Demodulator Input Clock
X400 (25MHz)
Replace it
X400
N
Y
Check LCD Module
Control board
Refer to Module CAS
- 20 -
6. Analog TV VIDEO
Check RF Cable
Check CVBS signal
TU400 #16 Pin
Replace
Tuner(TU400)
Check CVBS signal
C112
Y
N
Check Tuner 5V Power
IC703 #5 Pin
Replace
IC703
Y
N
Y
Replace
N
Y
Replace
Mstar(IC100)
C112
7. Component Video
Check
input
signal format
Is it supported?
Check signal
C1711, C1712, C1713,R2021, R2022,
R2023
Replace it.
Check signal IC903 output
R991, R990, R993
Y
Y
N
Check JK901 / P2002
Replace connector
Y
N
Y
Replace it
N
Replace
Mstar(IC100)
Y
Check Component Cable
Click on the first or last page to see other 26LG40 (CHASSIS:LA89D) service manuals if exist.