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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Wednesday, 13 February 2019

HP - L1735A _ L1736A_L1737A_L1798A _ MDTV REAR PROJECTION TV _ SERVICE HELP

HP - L1735A _ L1736A_L1737A_L1798A _ MDTV Rear Projection TV _ Service Help



TO ENTER SERVICE MODE [FACTORY MODE]
{ Press "Source", "--", "CC", "SAP"} keys on the remote control in sequence to enter Service Mode [Factory Mode].
ADC CALIBRATION
  • Input "SMPTE" test pattern from generator to  TV component Port. {Component-1 of 2 is OK}
  • Set TV to Factory Mode.  Use Cursor on the remote control to move to "ADC Calibration" setting.
  • Press "OK" on the remote control.




ADC - VGA CALIBRATION 
  1. Input 16 Gray Scale pattern from the pattern generator to TV VGA Port.
  2. Set the TV to Factory Mode.  Use cursor on the remote to move to "ADC Calibration" setting.
  3. Press 'OK' button on the remote control.


OPTICAL ALIGNMENT
  1. Plug the power cord into the socket behind TV.
  2. Switch ON power and press keypad Power Button to ignite lamp.  Check if the Lamp is ON.
  3. Enter 'Factory Mode'.
  4. Press 'OK' to enter 'Optical Alignment' color bar image.  Slope / Shape / Trapezoid  to go to the permit area.  {Default value:  md5020/5820: left, right 25 Up, bottom: 16 md5880/6580: left, right: 37  up,bottom: 20}
  5. Move and rotate engine module, adjust the center line to frame.
  6. If the image is too high, adjust front I type screw clockwise rotation, the the screen will be moved to the lower side.  If the picture is too low, adjust I type screw to counter clockwise the unit in order to move the picture higher.
  7. Use ratch wrench locking front two fixed studs.
  8. Revolve the TV, use ratch wrench  locking back  tow fixed studs.  Attention:  When locking , can't damage the wire.
  9. Revolve TV again , use glue machine to drop location to two I type screw.