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!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday, 15 January 2019

AOC 198PW – 19 INCH TFT LCD TV – SERVICE MODE – SOFTWARE UPDATE – POWER AND INVERTER BOARD SCHEMATIC

AOC 198PW – 19 inch TFT LCD TV – Service mode – software update – power and inverter board schematic


How to enter the Service Mode, How to update the firmware, SMPS and back-light inverter circuit diagram - AOC 198PW-  - 19 inch TFT LCD TV
This monitor is equipped with VESA DDC2B capabilities according to the VESA DDC STANDARD. It allows the monitor to inform the host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities.
The DDC2B is a bi-directional data channel based on the I2C protocol. The host can request EDID information over the DDC2B channel.
-Take care during handling the LCD module with back-light unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-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.)
Factory (Service Mode) modes adjustment
To enter the factory mode
Turn on power, pull out the power cord,
 press the Menu button,
 and then plug the power cord. 
that will Auto adjust the picture to default. At the same time the factory OSD will be at the left top of the panel.
Bias adjustment
Set the Contrast to 50.
Set the Brightness to 80.
B. Gain adjustment:
Move cursor to “-F-” and press MENU key
Adjust 7800k color-temperature
1 Select the “AUTO LEVEL” option to auto adjust the picture to default,
2 Press “MENU” button, adjust 7800K color-temperature and the parameter is
x = 296 ±20, y = 311 ±20, Y = 180 ±10 cd/m2
Adjust 6500k color-temperature
1 Select the “AUTO LEVEL” option to auto adjust the picture to default,
2 Press “MENU” button, adjust 6500K color-temperature and the parameter is
x = 313 ±20, y = 329 ±20, Y = 180 ±10 cd/m2
Turn off the Power-button to quit from factory mode.
Firmware [Software Update]
Connecting to a computer
1. Connect the power cable to the AC port on the back of the monitor.
2. Connect one end of the 15-pin DVI-I cable to the back of the monitor and connect the other end to the computer's D-Sub port.
3. Connect the audio cable to audio in port on the back of the monitor
4. Connect the microphone cable to audio in port on the back of the monitor
5. Turn on your monitor and computer.
AOC 198PW power adapter board schematic 
AOC 198PW inverter board schematic
ISP Instruction
ISP tools requirement
1. 25PIN LPT cable.
2. MYSON burn-in board,
3. DVI-VGA cable

Change to VGA Mode
(1) Run MYSON MCU ISP burn-in tool,
(2) Set parameter,
3) Lode burn-in file,
Select the MCU software in 198PW ISP_CODE, then click “Open” button.
(4) When the file was loaded, then click “confirm” button.
(5) Click “RUN”, burn-in is in progress
6) burn-in is completed