Power Supply Drawing - LG 55LW5600 Troubleshooting Manual

55LW5600 Power Supply Drawing
BD101
+
-
RL101
F100
5A / 250V
SK100
AC In
Different Size, W/Washer
63V Line:
PWR-ON turns on the 63V
supply but it will only be 56V.
Note: A block of LEDs can be
turned on with this voltage.
It will increase to 63V when the
DRV-ON line goes high.
63V
- + - +
C257 C256
L601 D253
VC_2C
Q251
Q602
SMPS BOARD
p/n: EAY62169901
Q601
D603
IC102
T101
F101
3.15A / 250V
Stby: 57V
Run: 396.5V
F501
Q102
1A / 250V
Stby: 154V
Q101
Run: 398.5V
MODEL LGP55-11SLPB
INPUT 100-240V~50/60Hz
3.5V = 1.8A
12V = 2.8A
OUTPUT
24V = 1.2A
81.4V = 1.6A
P201 Connector "SMPS Board" To P502 "MAIN Board"
P202
P203
Cold (Chassis)
VC_3B
Gnd side
VC_3A
VC_2D
P701
n/c
D251
D252
P832 13~15
D255
D256
P201
D261
D202
Stand-By
D201
3.5V
Source
T501
Hot
F501
Ground
IC502
Side
IC501
SMPS TEST 1: To Force Power Supply On.
Disconnect P502 on Main board.
(A) Jump pins 9, 10, 11 or 12 (STBY_3.5V) to pin 1. Test Voltage Outputs 12V, 24V to
Main and 56V to the Panel LEDs. Remove AC power. Leave the jumper in place.
2.5A
No Backlights at this time.
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 63V then back down to
63V.
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.
51
Pin Label STBY
24 ERROR n/c
23 n/c n/c
22 PWM 0V
21 12V 0V
20 n/c n/c
19 12V 0V
18 DRV-ON 0V
17 12V 0V
16 V-SYNC n/c
Gnd Gnd
9~12 3.5V 3.56V
5~8 Gnd Gnd
2~4 24V 0V
1 PWR-ON 0V
(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.
Indicates Hot Ground
July 2011 LCD-DV 55LW5600
Run Diode Check
n/c 2.2V
n/c n/c
0.2V~3.3V OL
12.07V 0.48V
n/c n/c
12.07V 0.48V
3.24V OL
12.07V 0.48V
n/c n/c
Gnd Gnd
3.51V OL
Gnd Gnd
25V 1.1V
3.4V 1.16V