LG color monitors Flatron M3201C How to enter the, service mode, Service adjustments and circuit description

 

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