LG 39LN549C (CHASSIS:LA3AA) Service Manual ▷ View online
- 13 -
4.2. DPM operation confirmation
(Only Apply for MNT Model)
Check if Power LED Color and Power Consumption operate
as standard.
■ Set Input to RGB and connect D-sub cable to set
■ Measurement Condition: (100~240V@ 50/60Hz)
■ Confirm DPM operation at the state of screen without Signal
4.3. DDC EDID Write (HDMI 256Byte)
■ Connect HDMI Signal Cable to HDMI Jack.
■ Write EDID DATA to EEPROM(24C02) by using DDC2B
protocol.
■ Check whether written EDID data is correct or not.
* For SVC Ass’y, EDID have to be downloaded.
4.4. EDID DATA
1) All Data : HEXA Value
2) Changeable Data :
*: Serial No : Controlled / Data:01
**: Month : Controlled / Data:00
***:Year : Controlled
****:Check sum
- Auto Download
■ After enter Service Mode by pushing “ADJ” key,
■ Enter EDID D/L mode.
■ Enter “START” by pushing “OK” key.
※
Edid data and Model option download (RS232C)
NO
Item
CMD 1 CMD 2
Data 0
Enter
download
MODE
Download
‘Mode In’
A
A
0
0
When transfer
the ‘Mode In’,
Carry the com-
mand
Edid data
and Model
option
download
Download
A
E
00
10
Automatically
download
(The use of a
internal Data)
※
Caution
* Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
=> Caution
- Never connect HDMI & D-sub Cable at the same time.
- Use the proper cables below for EDID Writing.
- Download HDMI1, HDMI2 separately because HDMI1 is
different from HDMI2.
For Analog EDID
For HDMI EDID
D-sub to D-sub
DVI-D to HDMI or HDMI to HDMI
No.
Item
Condition
Hex Data
1
Manufacturer ID
GSM
1E6D
2
Version
Digital : 1
01
3
Revision
Digital : 3
03
●
EDID DATA
(1) HD EDID Data
CheckSum
Physical Address (0x9E)
HDMI 1
A4/5B
10
HDMI 2
A4/4B
20
- 14 -
(2) FHD EDID Data(Deep Color support)
CheckSum
Physical Address (0x9E)
HDMI 1
43/DE
10
HDMI 2
43/CE
20
HDMI 3
43/BE
30
- HDMI
-RGB
(3) FHD EDID Data(Deep Color not support)
CheckSum
Physical Address (0x9E)
HDMI 1
43/25
10
HDMI 2
43/15
20
HDMI 3
43/05
30
- HDMI
-RGB
- 15 -
4.5. Outgoing condition Configuration
■ When pressing IN-STOP key by SVC remocon, Red LED
are blinked alternatively. And then automatically turn off.
(Must not AC power OFF during blinking)
4.6. GND & Hi-pot test
4.6.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
4.6.2. GND & HI-POT auto-check
(1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) GND Test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, execute next process (Hi-pot test).
(Remove A/V CORD from A/V JACK BOX)
(5) HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next
process automatically.
4.6.3. Checkpoint
(1) Test voltage
①
①
3 Poles
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
②
②
2 Poles
- SIGNAL: 3KV/min at 100mA
(2) TEST time: 1 second
(3) TEST POINT
①
①
3 Poles
- GND Test = POWER CORD GND and SIGNAL CABLE
GND.
- Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL.
②
②
2 Poles
- Hi-pot Test = Accessible Metal and LIVE & NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5mArms
- 16 -
TROUBLE SHOOTING
1. Power-up boot check
Check stand-by Voltage.
P401 3, 5pin : +3.5V_ST
Check 18pin Power connector
M ain B/D 3.5V Line
Short Check
Check X201 clock
24 M Hz
Replace X201
Check P401 PWR_ON.
1pin : 3.3V
Replace M star(IC101) or M ain board
Check M ulti Voltage
P401 9, 10pin : 24V
/ 13, 14, 15pin:12V
Replace Power Board
Check DRV ON Control
P401 2 pin : High
Check Power Board
Check IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.15V
IC404 : 1.5V
Q408 : 3.3V
Replace IC402, IC403, IC404, Q408
Re-download software.
Check stand-by Voltage
L402, L403 : +3.5V
Replace L402, L403
Check LVDS Power Voltage
Q406 : 12V
Replace Q406
Check M star LVDS Output
Replace M star(IC101) or M ain Board
Change M odule
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No
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