LG M3201C-BAFE.A**LLC, M3701C M3701C-BAFE.A**LLC, M4201C M4201C-BAFE.A**LLC
There are some special components used in LCD monitor that are important for safety. These parts are marked on the schematic diagram and the replacement parts list. It is essential that these critical parts should be replaced with the manufacturer’s specified parts.
If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may damage the panel.)
Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.
Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)
Block diagram
Description of block diagram
AV input selection circuit
1) AV(Video) INPUT SELECT : This section is composed of Video
switching IC (CXA2040AQ_IC513) and peripheral devices.
Video switching IC(CXA2040AQ_U201) selects CVBS video or S-video and the signal
is sent to Scaler IC(IC101).
2) AV Sync Detection : This section is composed of Sync Separator
IC(LA7217M_IC509) and peripheral devices.
Av input selection block sends selected signal to Sync detection block then
sync detection block identifies if AV signal is present or not. And this block
sends this information to Scaler(Micom).
2. Component INPUT
Component input signal was connected from input jack to scaler directly.
3. RGB INPUT OUTPUT CIRCUIT
1) D-SUB RGB INPUT OUTPUT : This section is composed of RGB Input Output
Jack(P503), Schmitt trigger inverter IC(IC507), OP-AMPs(IC510, IC511, IC512)
and peripheral devices.
RGB input signal path was connected from input jack to Scaler directly. But
scaler receives RGB Sync signal via schmitt trigger inverter IC.
RGB output signal was made by OP-Amp ICs. And this sends output signal to RGB
output jack.
4. HDMI INPUT CIRCUIT
This section is composed of TMDS receiver IC(ANX9021_IC508), ESD
protection diode(CM2021_D526, D527) and peripheral devices.
TMDS receiver IC receives TMDS signal via ESD protection diode. And it convert
HDMI signal to digital RGB signal. And it sends to scaler.
5. RS-232C INPUT OUTPUT CIRCUIT
This section is composed of RS-232C IC(ICL3232C_IC503), and peripheral
devices.
Computer and scalar(micom) was connected by RS-232C IC.
7. AUDIO DECODER
This section is composed of MSP4440K(IC804), NTP2000(IC805) and
peripheral devices.
MSP4440K is processing audio signal(AV, Component, PC Audio and IIS).
Digital audio processor IC receives IIS signal from MSP4440K, and converts IIS
to PWM signal.
This IC's output signal is sent to Audio Amplifier IC(TAS5122_IC802).
8. AUDIO AMPLIFIER
This section is composed of TAS5122(IC802) and peripheral devices.
Audio Amplifier's function is amplification of sound signal received from Audio
Decoder.
Input Audio signal is amplified according to the DC Volume control curve.
Adjustment
All
adjustment are thoroughly checked and corrected when the monitor leaves the
factory, but sometimes several minor adjustments may be required.
Adjustment should be following procedure and after warming up for a minimum of
30 minutes.
Alignment appliances and tools.
- IBM compatible PC
- Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.)
- Oscilloscope.
- White Balance Meter. (CA-110)
DDC Data Write Procedure-Analog
1) Use this procedure only when there is some problem on Analog
EDID data.
2) Run alignment program for M3201C on the IBM compatible PC.
3) Select EEPROM →Analog EDID write command and Enter.
4) This will write the Analog EDID data to EEPROM.
2. DDC Data Write Procedure-Digital
1) Use this procedure only when there is some problem on Digital EDID
data.
2) Run alignment program for M3201C on the IBM compatible PC.
3) Select EEPROM →Digital EDID write command and Enter.
4) This will write the Digital EDID data to EEPROM.
Cable Connection
Windows EDID V1.0 User Manual
Service OSD
The OSD is displayed when 'ADJ Key is pressed on
ADJUST REMOCON in Service Menu.
Description of operation
- LW61A : Model
chassis
- Cortez Version : Software
Version
- Panel Used : Use time the
Panel
- Area Option
- OPTION 1
- OPTION 2 Not Use
- OPTION 3
- OPTION 4
- System Control 3 :
Debug Print Set up
- Power-off History : History
Memory of Abnormal
- Fan Control : Nothing
The OSD is displayed when 'OK' Key is pressed on
Tool Option 1 in Service Menu.
Tool Option 1
- MODULE : Inch,
make factory Module change
- Cortez Version : Fix SW (Not
change)
The OSD is displayed when 'OK' Key is
pressed on Tool Option 2 in Service Menu.
Tool Option 2
- Tuner Num. : Fix No
Tuner (Not Adjust)
- EYE : Fix Intelligent Eye Not
Action (Not Adjust)
- INDEX : Nothing
- RGB ONLY : Select the RGB Only
Model
- Full : Set the ARC Full
- HDMI Type : Fix HDMI : 1-HDMI
(Not Adjust)
The OSD is displayed when 'OK' Key is pressed on
System Control 1 in Service Menu.
System Control 1
- SpritZoom / Save
sprilt Zoom : Nothing
- 2 Hour Off opt. : If no key
input is made for 2 hours, Sets the Power off
- OSD Rotate : Nothing
- Favorite Key / Exit Key / Navigation
Key : Remot conntroller Key (Not adjust)
The OSD is displayed when 'OK' Key is pressed on
System Control 2 in Service Menu.
System Control 2
- System : Sets
the Color system mode
- OverScan : Sets the Video
Signal OverScan
- RS-232 Host : Nothing
- Baud Rate : Sets the RS-232
communication speed
- RS-232 Select : Select the
RS-232 communication
- AGC-L : Nothing
- Audio Delay : Sets the Audio
Delay(ms)
The OSD is displayed when 'OK' Key is pressed on
BlkLine Detector in Service Menu.
BlkLine Detector
- BlkLine Min :
Sets the BlkLine Min
- BlkLine Max : Sets the BlkLine
Max
- Full Time : Sets the Full time
- Original Time : Sets the
Original time
The OSD is displayed when 'OK' Key is pressed on
Panel Control in Service Menu.
Panel Control
- AV / PC :
Nothing
- ISM : Nothing
- Gamma : Nothing
- Pwr.Save : Nothing
- Bright : Nothing
- Pnl.Lock : Nothing
- OrbitPixel : Sets the Pixel
- Orbit Step : Sets the Step
- Orbit Time : Sets the Time
- Inv.Time : Sets the inversion
time
- GUC : Nothing
- AMSE : Nothing
- Module Download : Nothing
- Reset Panel Used Time : Reset
the Panel Use Time
Hotel option
Hotel Option
- Station Menu Display :
Nothing
- Program Change : Nothing
- Input Source Change : Enables
(Yes)/Disables (No) input source change.
- Fixed Volume : Sets Yes
(Fixed)/No (Variable) about whether the sound volume will be fixed to the
current value or not.
- Max Volume : Sets the maximum
volume within the range of 0 ~ 100 when volume control is allowed.
- OSD Display : Nothing
- Remote Control Operation : Activates
(Yes)/Deactivates (No) remote control operation.
- Local Key Operation : Activates
(Yes)/Deactivates (No) local key operation.
- Power On Operation : Sets Yes
(Operation)/No (No operation) about whether the channel and the volume level that
will be displayed when the power is turned on.
- Set ID Lock : Sets the Set ID
function
- Set ID : Attach ID
- Auto Off Operation : Sets
whether the automatic turn-off function will be activated or not with On
(Activated) or Off (Deactivated) option, which turns off the TV if no key input
is made for 2 hours, using Auto Off operation and On Time on the Time menu.
- Hotel Mode Operation : Sets
whether all Hotel functions will be enabled
(Yes) or disabled (No).
Auto color balance and white balance
Auto Color Balance (Hex) : Adjust Color Balance
White Balance: Adjust White Balance