LG 42PT250B Service Manual page 39

Module Control Trouble Shooting
"TILT" on Adjust Remocon
: PDP internal pattern displays?
Y
PDP Module is OK.
Check SCL,SDA line
1
SCL
0 0
SDA
Start
Chip ID Address Byte
By
Master
SCL (continue)
SDA (continue)
Master : Image Board
Slave : PDP Module
Copyright © 2011 LG Electronics Inc. All rights reserved.
Only for training and service purposes
N
PDP Module Power is OK?
Y
Replace PDP Module
Check Signal
N
output
0
0 W
1 1 1
Write
ACK
only
By Slave
(0x1C)
9 1
D7 D6
Command Data
ACK
for Addr
By Slave
N
Check SMPS & cable
Replace Control
N
Board
9 1
A7 A6
Command Address
Addr=A[7:0]
9
D0
ACK Stop
By Master
By Slave
< Sample Signal >
8
A1 A0
ACK signal Check
Low : OK
High : Error
SCL
SDA
LGE Internal Use Only