Dell E153 15" monitor - service mode - schematic diagram
ICs used: TL1451–S14431DY- SG6841–2SK2996(FET)–M24C02WMN6–WINBOND 78E65P-40-56L1125-137-X
Service ModePress MENU and AUTO-ADJUST button during press Power button will activate the factory mode.
Gain adjustment:
Move cursor to “Factory Setting” and press MENU key to enter this sub-menu.
Move cursor to “ Factory” and press MENU key.
Move cursor to “ Auto Level” and press MENU key to adjust Gain and Offset automatically.
There are two ways to entering Reboot Mode. The settings for Reboot Mode is as follow
Both P2.6 P2.7 are LOW and RESET pin is HIGH.
P4.3 is LOW and RESET pin is HIGH.
Schematic diagram
SMPS (Power) and Back-light
Click on the schematics to zoom in
Main board
To
Use ISP WRITER
Press the “–“ key at front bezel and plug the AC power cord in, then the MCU enter ISP mode.
You will enter the window after executing the ispwriter.exe file.
Press the “–“ key at front bezel and plug the AC power cord in, then the MCU enter ISP mode.
You will enter the window after executing the ispwriter.exe file.
Click
the “Select Chip” button, and choose the type you’re going to program.
Click
the “Select Bank0” button and selecting a file which a binary Format required.
Select
the communication Setting: Port Name
Click
the “ConNect” button.
Click
“Program all” to start programming.
Executing
ISP
a. “Program All” button that will execute erase and program and verify. Then you can get the window as follow, and click “OK” to complete ISP process.
a. “Program All” button that will execute erase and program and verify. Then you can get the window as follow, and click “OK” to complete ISP process.
b.
Complete the ISP process, click“exit LD”button to reset monitor.
Software
Flow Chart
1)
MCU Initializes.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color. Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message disappears.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color. Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message disappears.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?
