LG Flatron L1800PM, LB886F-SL and Dell1800FP TFT SXGA LCD - CHASSIS:CL-29 LCD Monitor – troubleshooting schematic, service adjustments
Take
care during handling the LCD module with backlight unit.
Do
not press on the panel, edge of the frame strongly or electric shock as this
will result in damage to the screen.
USB
(Universal Serial Bus) is an innovation in connecting your different desktop
peripherals conveniently to your computer.
By using the USB, you will be able to connect your mouse, keyboard, and
other peripher to your monitor instead of having to connect them to your
computer. This will give you greater flexibility in setting up your system. USB
allows you to connect chain up to 120 devices on a single USB port, and you can
“hot” plug (attach them while the computer is running) or unplug them while
maintaining Plug and Plug auto detection and configuration. This monitor has an
integrated BUS-powered USB hub, allowing up to 2 other USB devices to be
attached it.
Power
Part.
This part consists of the one 5V, two 3.3V and one 2.5 regulators to convert power which is provided 12V, 5V in Power Board.
12V is provided for inverter, 5V is provided for Micom and LCD Panel.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.
This part consists of the one 5V, two 3.3V and one 2.5 regulators to convert power which is provided 12V, 5V in Power Board.
12V is provided for inverter, 5V is provided for Micom and LCD Panel.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.
MICOM
Part.
This part consists of EEPROM IC which stores control data, Reset IC and the Micom.
The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable.
The controlled data of each modes is stored in EEPROM.
This part consists of EEPROM IC which stores control data, Reset IC and the Micom.
The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable.
The controlled data of each modes is stored in EEPROM.
Inverter
The inverter converts from DC12V to AC 700Vrms and operate back-light lamp of module.
The inverter converts from DC12V to AC 700Vrms and operate back-light lamp of module.
Operation
description - Power
EMI
components.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to adjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and also the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the dc output changing status through a photo transistor to primary controller to achive the stablized dc output voltage.
6. Signal collection.
This part function is to collect the any change from the dc output and feed back to the primary through photo transistor.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to adjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and also the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the dc output changing status through a photo transistor to primary controller to achive the stablized dc output voltage.
6. Signal collection.
This part function is to collect the any change from the dc output and feed back to the primary through photo transistor.
Schematic
Power PWB - component and foil side
Power schemtic
Audio schematic
LVDS schematic
MICOM schematic
Troubleshooting
Adjustment
should be following procedure and after warming up for a minimum of 10 minutes.
• Alignment appliances and tools.
- IBM compatible PC
- Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.)
- E(E)PROM with each mode data saved.
1. Adjustment Start
1) Display any pattern at any Mode.
2) Run alignment program for LB886F on the IBM compatible PC.
3) Select EEPROM → ALL INIT command and Enter
4) This will make all data to default state
5) Select COMMAND → PRESET START command and Enter
2. Adjustment for Factory Preset Mode
1) Select DIST. ADJ → FOS DEFAULT command and Enter
2) It will copy all factory default data to EEPROM automatically.
• Alignment appliances and tools.
- IBM compatible PC
- Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.)
- E(E)PROM with each mode data saved.
1. Adjustment Start
1) Display any pattern at any Mode.
2) Run alignment program for LB886F on the IBM compatible PC.
3) Select EEPROM → ALL INIT command and Enter
4) This will make all data to default state
5) Select COMMAND → PRESET START command and Enter
2. Adjustment for Factory Preset Mode
1) Select DIST. ADJ → FOS DEFAULT command and Enter
2) It will copy all factory default data to EEPROM automatically.
3.
Adjustment for White Balance
1) Display color 0,0 pattern at Mode 15.
2) Set External Bright to MAX position and Contrast to
MAX Position.
3) Select PRESET START → BIAS CAL command and Enter.
4) No attempt to manually adjust, BIAS data is automatically adjusted and saved to the EEPROM.
5) Display color 15,0 pattern at Mode 15.
6) Select DRIVE CAL command and Enter.
7) 5800K and 9300K are automatically adjusted and saved to the EEPROM.
8) Select PRESET EXIT command and Enter.
4. Adjustment for EDID
1) Use this procedure only when there is some problem on EDID data.
2) Connect the D-sub cable.
3) Select EEPROM → EDID Write command and Enter.
4) Select DDC(A) Write command and Enter.
5) Connect the DVI-I cable.
6) Select DDC(D) Write command and Enter.
1) Display color 0,0 pattern at Mode 15.
2) Set External Bright to MAX position and Contrast to
MAX Position.
3) Select PRESET START → BIAS CAL command and Enter.
4) No attempt to manually adjust, BIAS data is automatically adjusted and saved to the EEPROM.
5) Display color 15,0 pattern at Mode 15.
6) Select DRIVE CAL command and Enter.
7) 5800K and 9300K are automatically adjusted and saved to the EEPROM.
8) Select PRESET EXIT command and Enter.
4. Adjustment for EDID
1) Use this procedure only when there is some problem on EDID data.
2) Connect the D-sub cable.
3) Select EEPROM → EDID Write command and Enter.
4) Select DDC(A) Write command and Enter.
5) Connect the DVI-I cable.
6) Select DDC(D) Write command and Enter.
