Category: LCD Monitor Repair and Service
Contents of this article
- How to access to service mode
- White balance adjustment
- Power supply circuit
- FA5500AN, NCP1377 Notes
DELL W2606C
SERVICE MODE
After there
are no OSD pictures on screen ,Press Number key 0000 will into the factory
mode, and press Menu key to enter the Factory Mode
White Balance, Luminance
Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance, please set the Chroma-7120 MEM. Channel 3 to Natural colors, MEM. Channel 4 to 6500K color, MEM. Channel 9 to 9300K colors and MEM. Channel 10 to 5700K colors (Nature parameter is x =289 ± 15, y = 304 ± 15, 6500 parameter is x = 313 ± 15, y = 329 ± 15, 9300 parameter is x = 283 ± 15, y = 297 ± 15,5700 parameter is x = 328 ± 15, y = 344 ± 15),
The data of Y of all the mode is PC>300,AV>400,S-Video>400,Component>400cd/m2.
How to setting MEM.channel you can reference to Chroma-7120 user guide or simple use “ SC” key and “ NEXT” key to modify x,y,Y value and use “ID” key to modify the TEXT description
Following is the procedure to do white-balance adjust
@ after there are no OSD pictures on screen ,Press Number key 0000 will into the factory mode, and press Menu key to enter the Factory Mode.
@ In the factory mode ,the menu as follows:
5700K RGB
6500K RGB the data is the result of RGB after
9300K RGB W/B adjustment;
NATURAL RGB
Burn In Mode
Auto Balance Auto level adjusts.
Initial NVRAM Initial EEPROM
Boot Power State ON/OFF
The steps of the PC W/B adjustment as follows:
I. Initial the EEPROM
Press “Initial NVRAM” button;
II. Bias (Low luminance) adjustment:
Prepare: ensure the currently mode is PC (VGA)
Press “Auto Balance” button (the image is black and white at the PAT42)
III. Gain adjustment:
1. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
2. Let the signal output the white image (press pattern 105), select one of the color temp (as Natural,6500K,9300K ,5700K) and adjust RGB until up to 100±3.
3. Select another color temp and follows as item 2.
The steps of the AV W/B adjustment as follows:
The steps of AV W/B adjustment as follows:
Gain adjustment:
1. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
2. Let the signal output the white image (press pattern 105), select one of the color temp (as Natural,6500K,9300K,5700K) and adjust RGB until up to 100±3.
3. Select another color temp and follows as item 2.
The steps of the SV(S-Video) W/B adjustment as follows:
The steps of SV’s W/B adjustment is the same as AV’s.
The steps of the CP(component) W/B adjustment as follows:
The steps of CP’s W/B adjustment as same as PC’s.
Max Brightness measurement:
a. Switch to the full white pattern, in normal mode main menu:
Set <Picture Settings> menu Brightness, Contrast to the max.
b. The Minimum brightness is 400cd/m²
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance, please set the Chroma-7120 MEM. Channel 3 to Natural colors, MEM. Channel 4 to 6500K color, MEM. Channel 9 to 9300K colors and MEM. Channel 10 to 5700K colors (Nature parameter is x =289 ± 15, y = 304 ± 15, 6500 parameter is x = 313 ± 15, y = 329 ± 15, 9300 parameter is x = 283 ± 15, y = 297 ± 15,5700 parameter is x = 328 ± 15, y = 344 ± 15),
The data of Y of all the mode is PC>300,AV>400,S-Video>400,Component>400cd/m2.
How to setting MEM.channel you can reference to Chroma-7120 user guide or simple use “ SC” key and “ NEXT” key to modify x,y,Y value and use “ID” key to modify the TEXT description
Following is the procedure to do white-balance adjust
@ after there are no OSD pictures on screen ,Press Number key 0000 will into the factory mode, and press Menu key to enter the Factory Mode.
@ In the factory mode ,the menu as follows:
5700K RGB
6500K RGB the data is the result of RGB after
9300K RGB W/B adjustment;
NATURAL RGB
Burn In Mode
Auto Balance Auto level adjusts.
Initial NVRAM Initial EEPROM
Boot Power State ON/OFF
The steps of the PC W/B adjustment as follows:
I. Initial the EEPROM
Press “Initial NVRAM” button;
II. Bias (Low luminance) adjustment:
Prepare: ensure the currently mode is PC (VGA)
Press “Auto Balance” button (the image is black and white at the PAT42)
III. Gain adjustment:
1. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
2. Let the signal output the white image (press pattern 105), select one of the color temp (as Natural,6500K,9300K ,5700K) and adjust RGB until up to 100±3.
3. Select another color temp and follows as item 2.
The steps of the AV W/B adjustment as follows:
The steps of AV W/B adjustment as follows:
Gain adjustment:
1. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
2. Let the signal output the white image (press pattern 105), select one of the color temp (as Natural,6500K,9300K,5700K) and adjust RGB until up to 100±3.
3. Select another color temp and follows as item 2.
The steps of the SV(S-Video) W/B adjustment as follows:
The steps of SV’s W/B adjustment is the same as AV’s.
The steps of the CP(component) W/B adjustment as follows:
The steps of CP’s W/B adjustment as same as PC’s.
Max Brightness measurement:
a. Switch to the full white pattern, in normal mode main menu:
Set <Picture Settings> menu Brightness, Contrast to the max.
b. The Minimum brightness is 400cd/m²
Install the software (Gprobe 5.0)
for ISP burn in
Operating system
(1) Microsoft windows OS.
(2) 100M free hard-drive space.
(3) 1 free parallel port for DDC2BI communication.
Operating system
(1) Microsoft windows OS.
(2) 100M free hard-drive space.
(3) 1 free parallel port for DDC2BI communication.
A. Double-click the Install
software,
Select the folder where you would like
Genesis Gprobe 5 to be installed
Completing the Genesis Gprobe 5 setup wizard,
Note: After finishing the
installation, you must restart the PC.
B. Next, installing the Update software,
Completing the update 1 for Genesis Gprobe
5.0 setup wizard,
B. Copy the “ChipDB” folder to
the install folder, replace the primary one
Run the program
After the installation, a short-cut icon will appear on your desktop, double click it will run the program.
(1). Select the IC type FL18532-BD (NOTE: If there is not this selection, please check the “ChipDB”),
After the installation, a short-cut icon will appear on your desktop, double click it will run the program.
(1). Select the IC type FL18532-BD (NOTE: If there is not this selection, please check the “ChipDB”),
(2). Open the configure file “isp_flash8_aoc.txt”
Note: When you change the path of the firmware, you must push to save
the configure
(3). Click Execute , there will appear the chart
(3). Click Execute , there will appear the chart
Run the DDC burn in program
(1) Double-click “WinDDC.exe”; it will appear
(2) Click “WriteEDID”, it displays the
following textbox. Input the Serial Number printed on the barcode label
(3) The process of DVI DDC burn in is the
same to VGA burn in process.
FAN5500 Power Factor Correction
Description
FA5500A/FA5501A are control ICs for a power factor correction converter using critical conduction mode of operation. This IC uses a CMOS device with high dielectric strength (30V) to implement low power consumption. These ICs contain compensated current sense comparator for light load and open/short protection at feedback (FB) pin. Compensated current sense comparator for light load keeps output voltage constant from no-load to full load. Open/short protection at FB pin stops output pulses when voltage divider to detect output voltage becomes fault.
Features
# Low current consumption by CMOS process
Start-up : 20µA(max.), Operating : 1mA(typ.)
# Drive circuit for connecting a power MOSFET directly
# Output peak current, source : 500mA, sink : 1000mA
# Compensated current sense comparator for light load
# Open/short protection at feedback (FB) pin
# Undervoltage Lockout
FA5500A: 11.5V ON / 9V OFF FA5501A:13V ON / 9V OFF
# Overvoltage protection
# Restart timer
# Package: DIP-8 / SOP-8
FA5500A/FA5501A are control ICs for a power factor correction converter using critical conduction mode of operation. This IC uses a CMOS device with high dielectric strength (30V) to implement low power consumption. These ICs contain compensated current sense comparator for light load and open/short protection at feedback (FB) pin. Compensated current sense comparator for light load keeps output voltage constant from no-load to full load. Open/short protection at FB pin stops output pulses when voltage divider to detect output voltage becomes fault.
Features
# Low current consumption by CMOS process
Start-up : 20µA(max.), Operating : 1mA(typ.)
# Drive circuit for connecting a power MOSFET directly
# Output peak current, source : 500mA, sink : 1000mA
# Compensated current sense comparator for light load
# Open/short protection at feedback (FB) pin
# Undervoltage Lockout
FA5500A: 11.5V ON / 9V OFF FA5501A:13V ON / 9V OFF
# Overvoltage protection
# Restart timer
# Package: DIP-8 / SOP-8
PIN
1 FB - Voltage Feedback Input Input for
monitoring PFC output voltage
2 COMP -Compensation Output of error amplifier
3 MUL - Multiplier Input Input of multiplier for monitoring sinusoidal waveform
4 IS - Current Sense Input Input for sensing MOSFET current signal
5 ZCD - Zero Current Detect Input Input for detecting that the inductor current reaches zero
6 GND - Ground Ground
7 OUT- Output Output for direct driving a power MOSFET
8 VCC- Power Supply Power supply for IC
2 COMP -Compensation Output of error amplifier
3 MUL - Multiplier Input Input of multiplier for monitoring sinusoidal waveform
4 IS - Current Sense Input Input for sensing MOSFET current signal
5 ZCD - Zero Current Detect Input Input for detecting that the inductor current reaches zero
6 GND - Ground Ground
7 OUT- Output Output for direct driving a power MOSFET
8 VCC- Power Supply Power supply for IC
NCP1377 PWM Current-Mode Controller
Description
The NCP1377 combines a true current mode
modulator and a demagnetization detector which ensures full borderline/critical
Conduction Mode in any load/line conditions together with minimum drain voltage
switching (Quasi−Resonant operation). Due to its inherent skip cycle
capability, the controller enters burst mode as soon as the power demand falls below
a predetermined level. As this happens at low peak current, no audible noise
can be heard. For NCP1377, an internal 8.0 s timer prevents the free−run frequency
to exceed 100 kHz (therefore below the 150 kHz CISPR−22 EMI starting limit),
while the skip adjustment capability lets the user select the frequency at
which the burst foldback takes place. For NC1377B, the internal timer duration
is reduced to 3.0 s to allow operation at higher frequencies (up to 300 kHz).
PIN
1 Demag - Core reset detection and OVP. The auxiliary
FLYBACK signal ensures discontinuous operation and offers a fixed
overvoltage detection level of 7.2 V.
2 FB - Sets the peak current setpoint. By connecting an optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand. By bringing this pin below the internal
skip level, you shut off the device.
3 CS - Current sense input and skip cycle level selection .This pin senses the primary current and routes it to the internal comparator via an L.E.B. By inserting a resistor in series with the pin, you control the level at which the skip operation takes place.
4 - GND The IC ground
5 Drv - Driving pulses. The driver’s output to an external MOSFET.
6 VCC - Supplies the IC. This pin is connected to an external bulk capacitor of typically 10 F.
7 NC − This unconnected pin ensures adequate creepage distance.
8 HV - High−voltage pin .Connected to the high−voltage rail, this pin injects a constant current into the VCC bulk capacitor and ensures a clean lossless startup sequence.
overvoltage detection level of 7.2 V.
2 FB - Sets the peak current setpoint. By connecting an optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand. By bringing this pin below the internal
skip level, you shut off the device.
3 CS - Current sense input and skip cycle level selection .This pin senses the primary current and routes it to the internal comparator via an L.E.B. By inserting a resistor in series with the pin, you control the level at which the skip operation takes place.
4 - GND The IC ground
5 Drv - Driving pulses. The driver’s output to an external MOSFET.
6 VCC - Supplies the IC. This pin is connected to an external bulk capacitor of typically 10 F.
7 NC − This unconnected pin ensures adequate creepage distance.
8 HV - High−voltage pin .Connected to the high−voltage rail, this pin injects a constant current into the VCC bulk capacitor and ensures a clean lossless startup sequence.
POWER SUPPLY CIRCUIT DIAGRAM
CLICK ON THE IMAGE TO ZOOM IN
