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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Friday 22 March 2019

SHARP 28JF74H - SERVICE MODE - ADJUSTMENTS

SHARP 28JF74H - SERVICE MODE - ADJUSTMENTS



TO ENTER SERVICE MODE
  1. Connect a test pattern to the antenna termianal.
  2. Tune the receiver to this signal.
  3. Turn the recevier off using the main switch.
  4. Press 'Volume Dn' and 'Channel Up' buttons on the front of the receiver simultaneously.
  5. Keeping these buttons pressed, turn the mains on.
  6. When the set starts up, it will be in service mode.
  • Use channel up and down buttons to move between the options.
  • Use the volume up and down buttons to change the data.
  • Use standby button on the remote control to store the adjusted data into memory.
  • Turn the receiver off, to exit service mode.
When in service mode, the display will be
=====================================
               SERVICE SOFTWARE
Sw on: XXXX  Sw off:  XXXX  Hours On: XXXX
=====================================
The figures displayed in the XXXX locations are hexadecimal representations of the number of times that particular function has been executed.  For example, the hexadecimal number displayed after SW ON was 0E4A, this would correspond to the receiver being turned on 3658 times.

Note:  The receiver should be set to full mode before carrying out any geometry adjustments.  This can be achieved by pressing the 'wide screen' mode button on the remote control until 'Full Mode' appears on the OSD.  This can only be done out of service mode.
Just in the case the TV set requires a full geometry adjustment, proceed first with the Vertical, and after that adjust the horizontal parameters.