LG 42LV5500 - Power Supply (SMPS) Board Layout

42LV5500 Power Supply Drawing
42
(1)
P-DIM1 (Digital Dimming) Global Pin 22 can vary
according to incoming video IRE level, OSD Backlight
setting and room light condition.
0.2V 0% to 3.3V 100% and the Intelligent Sensor.
Output from the Video Processor IC900.
SMPS TEST 1: To Force Power Supply On.
Disconnect P502 on Main board.
(A) Jump pins 9, 10, 11 or 12 (3.5V) to pin 1. Test Voltage Outputs 12V, 24V to Main and
36V to the Inverter Section of the SMPS. Remove AC power. Leave the jumper in place.
SMPS TEST 2:
(B) Jump pins 9, 10, 11 or 12 (3.5V) to pin 18 (DRV-ON). Apply AC power, the
Backlights should turn on. Note, the LED B+ will now jump to 65V then back down to
45V.
Note; If there is a problem with a load from the panel backlights, you can remove AC and
Disconnect P202 or P203. When AC is reapplied, the Backlight LEDs should turn on for
about 4 seconds and then shut off.
MODEL
INPUT
OUTPUT
LGP4247-11SLPB
100-240V~50/60Hz 2.5A
3.5V = 1.8A
12V = 2.8A
24V = 1.2A
59.2V = 1.6A
Indicates Hot Ground
45V Line:
PWR-ON turns on the 45V
supply but it will only be 36V.
Note: A block of LEDs can not
be turned on with this voltage.
It will increase to 65V then drops
to 45V in less that 20 seconds
when the DRV-ON line goes
high.
Pin Label STBY Run Diode
24
ERROR
n/c n/c 2.03V
23
n/c
n/c n/c OL
22 PWM 0V OL
21 12V 0V 12V 0.48V
20 n/c n/c n/c OL
19 12V 0V 12V 0.48V
18 DRV-ON 0V 3.26V OL
17 12V 0V 12V 0.48V
16 V_Sync (n/c) n/c n/c OL
13-15 Gnd Gnd Gnd Gnd
9-12 3.5V 3.55V 3.53V 2.63V
5-8 Gnd Gnd Gnd Gnd
2-4 24V 0V 24.5V 1.09V
1 PWR-ON 0V 3.41V 1.15V
P201 Connector "SMPS Board" To P502 "MAIN Board"
0.2V~3.3V
Test1
0V
0V
12V
n/c
12V
0V
12V
n/c
Gnd
3.55V
Gnd
24.41V
3.55V
3.52V
SK100
AC In
BD101
47uF/450V 47uF/450V 47uF/450V
RL101
F501
1.6A / 250V
Q102
Q101
T501
IC501
IC502
F101
3.15A / 250V
D603
Q602
Q601
L601
T101
P701
P832
P201
P203
P202
n/c
IC102
VC_2B
VC_2D
VC_2C
VC_2A
VC_1D VC_1C
VC_1B VC_1A
VC_4D VC_4C
VC_4B VC_4A
VC_3D
VC_3C
VC_3B
VC_3A
D253
Q251
D251
D252
D255
D256
D261
-
+
F100
5A / 250V
SMPS BOARD
p/n: EAY62169801
100uF/100V 100uF/100V
+
-
+
-
C257 C256
45V
W/Washer
Different Size
Hot Ground Side
Cold (Chassis)
Gnd side
Stby: 399V
Run: 398.5V
Stby: 397V
Run: 396.5V
D201
D202
C202 ,1
Stand-By
3.5V
Source
May 2011 LCD-DV 42LV5500