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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Monday, 1 April 2019

RENAULT REAR SEAT ENTERTAINMENT SYSTEM CONTROL MODULE FAULT DIAGNOSIS AND REPAIR

RENAULT Rear Seat Entertainment System Control Module fault diagnosis and Repair

WORKING PRINCIPLE
  A micro-controller in the Control Module supplies and controls the power to the system via an I2C bus. On receipt of a power-on command from the Infrared Controller it performs a simple system check and then sends commands to other parts of the system to bring them on line.  When a screen has been selected using the infrared remote control the Control Module identifies the selected screen and displays on it a menu providing the user with access to the functions detailed below:
  • Independent switching of three Audio-Visual inputs (DVD, TV and AUX)
  • Video manipulation (Colour, brightness, contrast and aspect ratio of the display.)
  • Audio processor (Bass, Treble and Volume)
  • On-Screen instructions language selection
  • Switch on/off individual screen displays
  The Control Module also determines which media source has been routed to the selected screen and relays commands in the appropriate protocol. For example if, while Screen A is displaying the DVD transmission, an infrared play command is detected at screen A, it would be captured, stored and relayed to the DVD in the DVD's Infrared protocol. If screen B is displaying a TV transmission the play command would be transmitted in the vehicle's TV tuner infrared protocol. A non-volatile memory stores the display instruction language in use and the current Audio and Video settings for each output channel. These settings are reloaded on power-up with the exception of the audio volume level, which defaults to a low state. Support equipment that has been powered off is detected by the lack of video sync pulse. This can be caused by auto shutdown after extended pause mode. When this happens the module responds by transmitting a power-on command to the support equipment until it is ready to accept it and power up. The supply of the video sync pulse then resumes and the module stops transmitting the power-on command.
DISASSEMBLY
  • Loosen screws 1 to 4 and remove the control box lid.
  • Remove screws 5 to 8. and separate the PCB from the control box base.
  • Visually inspect the components for obvious signs of mechanical or electrical damage.

Diagnosis and Repair
* Connect the open control module to the test kit.
* Connect the 12.5 V power supplies to the test kit.
* Compare the symptoms observed. 
Initial Inspection and Test with the symptoms listed below to locate the components likely to be faulty and effect the necessary repairs.
CONNECTION DIAGRAM
CLICK ON THE PICTURES TO MAGNIFY