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!

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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 !

Thursday, 28 March 2019

GRUNDIG W56-2020 – SERVICE MODE – ADJUSTMENTS – CIRCUIT DIAGRAM

GRUNDIG W56-2020 – SERVICE MODE – ADJUSTMENTS – CIRCUIT DIAGRAM

Used ICs: TDA884x – SDA 55xx – TDA4605 - TDA8351 or TDA8356 – TDA6107 or TDA6108 – MSP3405C or MSP3415G – U4468B or TDA4445B – TDA7057A
 
 SERVICE MODE
All other service settings of TV set are made in so called service mode of TV set operation.  To enter this mode of operation press the keys in the following sequence: "TV", "I", and "STOP" within 5 seconds from switching on the TV set to normal mode of operation.  When the TV set is switched over to service mode the following status line with service parameter and parameter value appears on the screen:
The parameter to be set is selected with keys (P+/P-), and selected parameter is set with keys (volume+ /volume-). Each time you press the key for parameter selection (UP/DN ) the value of pre-selected parameter is stored. Therefore when the last setting is performed you must press one of the two keys once again. Values of individual parameters are expressed in hexadecimal form due to limited capacity of the memory. Values of individual parameters are variable from 0 to 3F, with the exception of some parameters where values are changed from 0 to 7F and O1, O2, O3, O4, O5 which have value range between 0 and FF.   When setting is finished it should obligatory be concluded with "STOP" key. After a few seconds the status line disappears and service adjustment is accomplished.
LIST OF SERVICE MODE PARAMETERS
COMPONENT LOCATION AND MEASURING POINTS FOR SUPPLY VOLTAGES ON MAIN CHASSIS – COMPONENT SIDE
FATAL ERROR DETECTION: [VIDEO PROCESSOR NOT DETECTED, or POWER UP RESET of Video Processor not finished – LED flashing with 1Hz.]
TDA8843 PIN DESCRIPTION
SDA553 and 24C16 PIN DESCRIPTION
MSP3411G (MSP3401G – MSP3405G – MSP3415G) PIN DESCRIPTION
CIRCUIT DIAGRAM
CLICK ON THE PICTURES TO MAGNIFY
DEMAGNETIZING OF PICTURE TUBE
Correctness of picture tube demagnetizing is usually automatically checked. Magnetization of picture tube is presented as one or more color "clouds", consequently color reproduction of the picture is not correct.  Each time the TV set is switched on with mains switch, demagnetizing system is activated. For correct demagnetizing procedure disconnect the TV set with mains switch and leave it disconnected for about 15 minutes. Afterwards when you switch on the TV, demagnetizing procedure is performed. In case distortion of color reproduction still persists, special demagnetizing coil should be used.
Posted By: FRANK at 06:13
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