Control Board Component Identification And Checks - LG 42PJ350 Training Manual

Control Board Component Identification and Checks

Control Board Component Identification and Checks
With the unit on, if D101 is not on, check 5V supply
from FS201 on the Y-SUS.
Pins 4~7 of P101. If present replace the Control
Board. If missing, see (To Test Control Board)
Note: IC121 (3.3V Regulator)
routed to both X Boards
1~3 (16V) 4-7 (M5V)
Ribbon Cable
Y-SUS and Y Drive Signals
To Y-SUS
To Test Control Board:
Disconnect all connectors.
Jump STBY 5V from SMPS P813 Pin 13
to pin 3 (left leg) of IC121.
Apply AC and turn on the Set. Observe
Control board LED D101, if it's on, most
likely Control board is OK.
CONTROL BOARD
p/n: EBR63632301
LVDS Video
from Main
n/c Upgrades
P163
P101
P121
IC121
IC201
IC121
(1) Gnd
(2) 3.3V
D101 LED
(3) 5.0V
3.3V TP
P161
3.3V from IC121
X-Drive Left
Pins 41~43
RGB Signals
* If the complaint is no video and shorting the points (AutoGen)
causes video to appear suspect the Main board or LVDS cable.
Note: LVDS Cable must be removed for Auto Gen to work.
Z-Drive Creation Signals
M5V and 16V to Z-SUS
P102
X103
25Mhz
VS_DA
IC103
IC171
Auto Gen
3.3V TP
P162
3.3V from IC121
Pins 8~10
3.3V and X-Drive
Center and Right
RGB Signals
84
August 2010
P102 "Control" to "Z-SUS Board" P1
Pin Label Run
1 Gnd Gnd
2 Y_OE 0.0V
Dummy_1
3 1.9V
4 CTL_OE 0.0V
5 ER_UP 0.1V
6
SUS_DN 0.86V
7
ZSUS_UP 0.15V
Gnd Gnd
8
9 (+5V) 5V
10 (+5V) 5V
11 (+15V) 18V
12 (+15V) 18V
18V generated by
IC171
D506 on Y-SUS
(1) Gnd
(2) 1.2V
(3) 3.3V
PANEL TEST: Disconnect P121 and
Remove LVDS Cable. Short across
Auto Gen TPs to generate a test
pattern when A/C power is applied.
IC121 Diode Check Pin 2 (3.3V)
TCPs In
0.6V Red Lead
0.39V Blk Lead
All Connectors Removed
0.64V Red Lead
0.40V Blk Lead
IC171 Diode Check Pin 2 (1.2V)
All Connectors Removed
0.32V Red Lead
0.32V Blk Lead
42PJ350
Diode
Gnd
Open
Open
Open
Open
Open
Open
Gnd
1.47V
1.47V
Open
Open
Plasma