REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Thursday, 7 February 2019

DELL E153FPC 15 INCH LCD MONITOR – HOW TO ENTER SERVICE MODE – CIRCUIT DIAGRAM

DELL E153FPc 15 inch LCD MONITOR – How to enter service mode – Circuit Diagram

Dell E153 15" monitor - service mode - schematic diagram 
ICs used: TL1451–S14431DY- SG6841–2SK2996(FET)–M24C02WMN6–WINBOND 78E65P-40-56L1125-137-X
Service Mode
Press 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.
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.
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
Posted By: FRANK at 02:18
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