LG 37LG300C (CHASSIS:LD85A) Service Manual ▷ View online
4.2 DDC EDID Write (RGB 128Byte )
- Connect D-sub Signal Cable to D-Sub Jack.
- Write EDID DATA to EEPROM (24C02) by using DDC2B
- Write EDID DATA to EEPROM (24C02) by using DDC2B
protocol.
- Check whether written EDID data is correct or not.
4.3. DDC EDID Write (HDMI 256Byte)
- Connect HDMI Signal Cable to HDMI Jack.
- Write EDID DATA to EEPROM(24C02) by using DDC2B
- Write EDID DATA to EEPROM(24C02) by using DDC2B
protocol.
- Check whether written EDID data is correct or not.
4.4 Serial number (RS-232C)
- Press “Power on” key of service remocon. (Baud rate :
115200 bps)
- Connect RS232 Signal Cable to RS-232 Jack.
- Write Serial number by use RS-232.
- Must check the serial number at the Diagnostics of SET UP
- Write Serial number by use RS-232.
- Must check the serial number at the Diagnostics of SET UP
menu. (Refer to below).
4.5. EDID DATA
(1) RGB 128Byte
(2) DIGITAL DATA(HDMI-1) 256Byte
(3) DIGITAL DATA(HDMI-2) 256Byte
1) All Data : HEXA Value
2) Changeable Data :
2) Changeable Data :
*: Serial No : Controlled / Data:01
**: Month : Controlled / Data:00
***:Year : Controlled
****:Check sum
**: Month : Controlled / Data:00
***:Year : Controlled
****:Check sum
4.6. HDCP
(High-Bandwidth Digital Contents Protection)
SETTING (Scaler : Mstar)
- Connect D-sub Signal Cable to D-Sub Jack
- Input HDCP key with HDCP-key- in-program
- HDCP Key value is stored on EEPROM (AT24C512) which
- Input HDCP key with HDCP-key- in-program
- HDCP Key value is stored on EEPROM (AT24C512) which
is 0x80 addresses of 0xA0 page
- AC off/ on and on HDCP button of MSPG925 and confirm
whether picture is displayed or not of using MSPG925
- HDCP Key value is different among the sets.
4.7. 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)
blinked alternatively. And then Automatically turn off. (Must
not AC power OFF during blinking)
Confirm whether is normal or not when between power
board's ac block and GND is impacted on 1.5kV(dc) or
2.2kV(dc) for one second
board's ac block and GND is impacted on 1.5kV(dc) or
2.2kV(dc) for one second
- 13 -
- 14 -
TROUBLESHOOTING
1. No Power
(1) Symptom
1) It is not discharged minutely from the module.
2) Light does not come into the front LED.
2) Light does not come into the front LED.
(2) Check process
Plug in the power cord.
Yes
No
Connect the Cable.(SC100)
No
Is the fuse of PSU
normal?(F101)
Replace the Fuse.
Yes
No
Is it connected
that PSU and P1100 in
Main B/D?
Connect the Cable P1100.
Yes
No
After all cables connect is removed to PSU, the AC
voltage marking is authorized on manual.
When ST-BY 5V, +15V are not operated, replace PSU.
voltage marking is authorized on manual.
When ST-BY 5V, +15V are not operated, replace PSU.
Is inserted a plugged
in power cord?
Is the Line Filter
and PSU connected?
- 15 -
Yes
Yes
No
No
Replace the Power board.
Check the LCD Module.
Reconnect Panel link cable.
(P401 or P406 or P407)
(P401 or P406 or P407)
Replace the VSC.
No
Yes
No
No
Does minute discharge
at Module?
Is the link
cable normal?
Is the IC801’s
output normal?
Is the inverter
/ VaVs on?
2. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is blue.
2) It maintains the condition where the front LED is blue.
(2) Check process
Is output the normality
Low/High voltage except
Stand-by 5V?
Low/High voltage except
Stand-by 5V?
Yes
No
No
Yes
Check the Power.
Cable inserts well.
Change the IC(IC100).
Yes
No
No
Check the Tuner.
Is video
output of the Tuner
normal?(Check TU500
_Pin15)
Is the LVDS cable
connected well?
Is the input
voltage normal?(Check
TU500_Pin4)
Is the I2C communication
Normal?(Check Pin10, Pin11)
3. Unusual display from TV/CATV mode
BLOCK A
- 16 -
Yes
No
No
Yes
Check the Power.
Same as Block A.
No
Check the Tuner.
Is video
output of the tuner
normal?(Check TU500_
pin24~pin34)
Is the input
voltage normal?(Check
Pin21,22)
Is the I2C communication Normal?
(Check Pin18, Pin19)
(Check Pin18, Pin19)
4. Unusual display from DTV mode
Yes
No
Check the input source.
Same as Block A.
Same as Block A.
No
Check the IC700.
No
Yes
Is video
input of SCART Jack
normal?(Check JK601
_Pin20)
Check the input source.
Is video
input of the RGB Jack
normal?(Check JK601
_Pin7,11,15)
No
Is waveform
of Switching IC normal?
(Check IC700_Pin11,
12,13)
5. Unusual display from AV1(SCART) mode
- CVBS Input
- RGB Input
6. Unusual display from AV2(SIDE AV) mode
- CVBS Input
Yes
No
Same as Block A.
Is video input
of RCA Jack normal?
(Check R704)
Check the input source.
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