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 18 March 2019

HOW TO ENTER SERVICE MODE-VIDEOCON 21NF55 - VIDEOCON 21PF93 - ADJUSTMENTS DURING SERVICE

HOW TO ENTER SERVICE MODE-VIDEOCON 21NF55 - VIDEOCON 21PF93 - ADJUSTMENTS DURING SERVICE


SUPPLY VOLTAGE
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to the rated voltage.
Make sure that the supply voltage is within the range of the rated value.
  • Connect a digital voltmeter to the +B voltage output terminal of the TV set. Power on the TV and set the brightness and sub - brightness to minimum.
  • Regulate voltage adjustment components on the power PCB to make the voltmeter read 115±1V.
DESIGN/SERVICE MODE
Caution: The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing. As the control data have dramatic effects on functions and performance of the TV, service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings.
  • Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the MENU button on the TV to enter the SERVICE mode. (In this case, the S mode cannot be stored in the EEPROM. 
  • To exit from the S mode, turn off the TV set. )
  • After entering the S mode, Red  “S” is displayed on the upper center of the screen and MENU1 is default. 
  • Use the POS+/ -buttons to highlight an adjustment and the VOL+/- buttons to adjust it. The adjusted data are immediately output and stored in the EEPROM.
SERVICE MODE BUS DATA
{Click on pictures to Zoom In}
OPTIONS
With remote control system software TDA935X, all options can be set in the SERVICE mode and stored in EEPROM. Data related to picture, sound and geometric adjustment are also stored in EEPROM.
OPTION BIT SETTING
CLICK ON THE CHARTS TO ZOOM IN
Do not change the data marked with  “ _ ”in  “Data” column.
Check if the color/sound systems conform to the specifications of different models after setting.