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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Saturday, 9 February 2019

SHARP LC-20S1M _ ADJUSTMENT PROCEDURE_SERVICE MODE_ INITIALIZATION _ LAMP ERROR DETECTION

SHARP LC-20S1M _ ADJUSTMENT PROCEDURE_SERVICE MODE_ INITIALIZATION _ LAMP ERROR DETECTION






Use the exclusive-use AC adapter or stable DC power supply.
AC adapter: UADP-A043WJPZ
DC power supply: 12 ± 0.5V 5.0A.


  • Adjusting the checker

Turning on the power (initialization) => Setting the model and size in inches => Transferring the model-specified data to the E2PROM (I2C) => Calling the adjustment process mode => Starting the adjustment (+B adjustment).
  • Adjusting the finish process

Reassembling the set => Turning on the power => Calling the adjustment process mode (using the remote controller) => Adjusting the counter bias, TV contrast and white balance

MAIN ADJUSTMENT PROCESS MODE

  1. Set the Pin (81) (KEY4) or Pin (82) (KEY5) of IC2001 (microprocessor) to "L", turn on the power.
  2. For servicing, hold down the "TV/VIDEO" and "MENU" keys at once, and turn on the "POWER" switch. (Make sure the process mode "K" appears at the top left of the screen.) Then press the "CH (UP)" and "VOL (–)" keys at once. (Make sure the adjustment process mode screen shows up.) 
  3. To quit this mode, turn off the power. (Orturn off the "POWER" switch or use the remote controller’s "OFF" key.).
ADJUSTMENT PROCESS KEYS
  • Using the "CH (UP)/(DN)" key, turn up and down reception (broadcasting) channels.  Just click on the key, and channels are selected on by one.  Hold down the key, and the next receivable channel is searched up and down.
  • Adjustment items:  Adjust each of the items by using the "MENU", "CURSOR UP/DOWN" and "VOL (+)/(–)" keys (on the set or on the remote controller).
  • Select an adjustment item using the "CURSOR UP/DOWN" key.
  • An adjustment item is toggled on and off by activating the MENU SELECT key (next item).

 Let’s suppose that the item at the bottom of a page is now selected. When the "MENU" key is activated here, the item at the top of the next page will be selected.

INITIALIZATION
  • Set pins (81) and (82) of IC2001 (microprocessor) to GND. Turn on the power.
  • Select the inch size (20).
  • Select the model number "A641M".
# Once "A641M" has been selected, the screen shuts off and the power turns off. But the power turns itself on to get the set restarted. (The microprocessor resets itself due to a change in model number.)

+B ADJUSTMENT
  1. Receive the colour bar signal.
  2. Adjust the voltage at pin (4) of P3701 to 5.00 ± 0.02 V.

Note: The 5.0 V level is used as reference for all the line voltages. Make this adjustment as precisely as possible.

LAMP ERROR DETECTION
  • The main unit of television is turned off 5 seconds after it is turned on. (The power LED on the front side of TV turns from green to red.)
  • If the situation 1 happens 5 times sequentially, television can not be turned on. (The power LED remains red.)
Check when turning off the lamp error detection
  • When television is turned off by the lamp error detection mentioned above, it enters the adjustment process with the power LED red. Entering the adjustment process turns off the error detection and turns on TV.
  • This enables the operation check to detect errors in the lamp or lamp circuit.
  • Check whether "ERROR NO RESET" on line 4, page 1 of the adjustment process is 1 or more. If it is 1 or more, it indicates the lamp error detection was execute.
RESETTING OF LAMP ERROR COUNT
  • After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO RESET" on line 4, page 1 of the adjustment process and set the number to 0 using the volume button.
Posted By: FRANK at 02:28
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