LG 37LN549E / 37LP63 H (CHASSIS:LD3AF) Service Manual ▷ View online
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(8) Check displayed image status(color, size) when TV is
turning on.
<Image for test- 720x576> Please use this image for test.
(9) Try this inspection with various resolution images.
* Must Restore to LG Logo.
(10) Press “MENU” key.
(11) Move cursor to OPTION and press “7” key 7 times.
(12) Select accurate CPU S/W file and check “LOGO Image”
button. (Press yellow color key on Remote Control.)
(13) Check LG Logo operation when TV is turning on.
8.3. USB Cloning Function check
● CASE 1. Clock LED Model
If the clock LED of TV 2 is on and TV 1, 2 had a same TV
channels → USB cloning is success!!
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● CASE 2. No Clock LED Model
If the auto volume of TV 2 is on and TV 1, 2 had a same TV
channels → USB cloning is success!!
8.4. Check Commercial features concerning
Output.(IR Out/SPK Out/External Clock)
8.4.1. External SPK Out and Volume control
(1) Connect external speaker to speaker out port with phone
jack on TV side as below.
(2) Check the Max. speaker output is 1W or not. Sine wave
with 1KHz will be displayed.
(3) Press Vol. control button up/down in turns and check the
waveform of Oscilloscope
8.4.2. IR Out
< Equipment & Condition >
▪ Simple Jig (commercial check JIG)
▪ Power only mode
(1) Connect each other RS232C port on the Commercial
Check JIG.
(2) Press any key on SVC Remote-control.
(3) Check the LED status of the Check JIG.
- IR LED(OK condition: blinking) (LED #1)
Button of Vol. control
Waveform of Oscilloscope
UP(+)
DOWN(-)
Button of Vol. control
Waveform of Oscilloscope
UP(+)
DOWN(-)
#1
Model Info
Commercial Feature
Name
IR Out External Speaker out External Clock
LP63xH-ZA
O
O
O
LN549E-ZA
O
O
X
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8.4.3. External Clock
< Equipment & Condition >
▪ Simple Jig (External Clock Assy)
▪ Power only mode
(1) Connect external Clock Assy to CLOCK INTERFACE.
(2) Check the LED CLOCK.
Check LED Clock in Power on mode.
* After finishing 8.1 ~ 8.4 inspections,
press “IN STOP” key.
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TROUBLESHOOTING GUIDE
1. Check the booting Voltage
Make sure the Stand-by Voltage.
P401 3, 5pin : +3.5V_ST
Make sure the Micom voltage.
L301 : +3.5V_ST
Make sure the output of MSTAR
LVDS.
Make sure the Multi Voltage.
P401 9, 10pin : 24V, 13~15pin : 12V
Make sure the CLK of X300
Is 10MHz.
Make sure the CLK of X300 is
10MHz.
Exchange the LCD Module.
Make sure the Output Voltage of IC
402/3/7.
IC402 : 2.5V, IC403: 1.1V, IC407 :
1.5V, Q403 : 3.3V
Push Micom Reset(SW300) and
make sure the PWR_ON
P401 1pin : 3.3V
Make sure the voltage of LVDS
Power.
Q409 : 12V
Make sure the Power
Connector.
Exchange the L301.
Exchange the Mstar(IC101
or Main board.
Exchange the circuit
board.
Exchange the X300.
Exchange the circuit or
check the LCD module.
Exchange the
IC402/3/7, Q403.
Re-download of
Firmware.
Exchange the Q409.
Make sure the disconnection of
Main board 3.5V circuit.
Exchange the Mstar(IC101)
Or Main board
Exchange the
Circuit board.
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
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