LG 50PQ30 Training Manual page 89

Unplug all connectors. Jump 5V from SMPS (P813 pins 9~12) to pin 1 of IC211. Observe LED. If it blinks, most likely
Control PWB is OK. FL111 and FL112 should be checked.
Disconnect P201 from the Y SUS Board and connect a Jumper from Pin 10 of P812 (M5V) to Pin 10 P201 (5V). The 5V will
be routed to the Control Board via FS201, Ribbon Cable P101 on the Y SUS Board to P111 on the Control board. Then
through FL111 and FL112 to all regulators on the Control Board. For Control Board operation verification, watch D201 for
blinking.
IC221
Note: IC221
(3.3V Regulator) Pin 1 (Gnd)
routed out P162 Pin 2 (3.3V)
(56~60)to X-PWBs Pin 3 (4.95V)
FL111 FL112
M5V
M5V Fuses
Gnd Gnd
(EMI Filters)
M5V
Pin 1~3 (17V)
Pin 4~7 (M5V)
P111 Ribbon Cable
Data and Clocks to
Y-SUS and Y-Drive
IC241
Pin 1 (3.3V) Pin 8 (3.3V)
Pin 2 (3.3V) Pin 7 (3.3V)
Pin 3 (Gnd) Pin 6 (Gnd)
Pin 4 (3.3V) Pin 5 (3.3V)
With the unit on, if D201 does not blink
on/off, check 5V supply.
If present replace the Control PCB
50PQ30 CONTROL BOARD (Troubleshooting Tips)
50PQ30 CONTROL BOARD (Troubleshooting Tips)
Used for ROM Updates
No Connection
P131
IC221
2
CONTROL BOARD
IC231
Pin 1 (Gnd)
Pin 2 (3.3V)
Pin 3 (4.95V)
P111
IC241
P161
To Left X Board
* If the complaint is no video and if shorting the
two points (AutoGen) causes video to appear
suspect the Main board or LVDS cable.
LVDS
P121
IC211
X101
25 Meg
Pin 1 (5V)
Pin 2 (1.8V)
Pin 3 (Gnd)
IC201
Auto Gen
MCM
P101
D201
P162
To Right X Board
From Pin 2 IC221 (3.3V)
P162 Pins 56~60
Short across the two points labeled Auto Gen
to generate a test pattern.
(LVDS Cable Must Be Removed)
89 Published November 2009
IC141
Pin 1 (3.3V)
Pin 2 (0V)
IC141
Pin 3 (3.3V)
Pin 4 (Gnd)
Pin 5 (3.3V)
Pin 6 (0V)
Pin 7 (3.3V)
Pin 8 (0V)
P101
To Z-SUS
Pin 11/12 (17V)
50PQ30 Plasma