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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday, 25 March 2019

SHARP LC - 20S4E _ SERVICE MODE & ADJUSTMENT DETAILS

SHARP LC - 20S4E _ SERVICE MODE & ADJUSTMENT DETAILS




PREPARATION FOR ADJUSTMENTS
  • Use a stable AC power source.  LC-20S4E AC Power : 230V
  • Complete Set à Power ON à  Enter Adjustment Process Mode (By Remote Control) à RF AGC adjustment àDCXO adjustment à Common Bias adjustment à White Balance adjustment.
ENTERING ADJUSTMENT MODE
  • After power on, press the adjustment process mode key on the service remote control.
  • Switching on the TV set, holding pushed the "Input" and "Volume (–)" key at once, the TV set enters in the "K" mode.
  • In this condition, pushing "Volume (–)" and "P Dn” key, the adjust mode appears.
KEY OPERATIONS
  • Use the "UP" or "DOWN" cursor key to select the adjustment mode item.
  • Use the "LEFT" or "RIGHT" cursor key to change the data.
INITIALIZATION 
When the EEPROM (IC101) has been replaced or when the EEPROM has been initialized, readjust the each adjust the each adjustments.

WHEN EEPROM IS REPLACED
  • Plug in the AC cord to an AC power outlet and turn on the power.
  • When the setting is finished, the LED turns from red to green. In about 15 seconds, the initialization is completed.
WHEN INITIALIZING EEPROM DATA
  1. Enter the Adjustment Process mode.
  2. Select the INIT TV item and press the "RIGHT" cursor key to enable the item.
  3. Unplug the AC cord and plug it again in the AC power outlet. Turn on the power.
  4. When the setting is finished, the LED turns from red to green. In about 5 seconds, the initialization is completed.  [NOTE:  When the INIT TV item has been enabled in the adjustment process, be sure to unplug the AC cord and plug it in again. Then start adjustments. Otherwise the readjusted data cannot be put in memory.]
SETTING SCREEN SIZE
  • Enter the Adjustment Process mode.
  • Check the model number.
  • Hold down the "LEFT" or "RIGHT" cursor key longer than 2 seconds, and select a screen size (20).
RF-AGC ADJUSTMENT
  1. Feed in the colour bar signal (Field strength: 52dBμ V)
  2. In Adjustment Mode, select RF AGC AUTO ("OFF") and press the "RIGHT" cursor key to start the adjustment.
  3. Automatic adjustment complete, when it displayed "OK".
  4. RF AGC data will be in the range of 0-63. If "NOK" is displayed, adjustment failed.
  5. Check that the value is 30±10.
DCXO ADJUSTMENT
  • Feed in the B/G NICAM signal. (Field strength: more than 70dBμ V.)
  • In Adjustment Mode, select the DCXO AUTO ("OFF") and press "RIGHT" cursor key to start the adjustment.
  • Automatic adjustment complete when "OK" is displayed. If "NOK" is displayed, adjustment failed.
  • Check that the value is 58±25.
COMMON BIAS ADJUSTMENT
  1. In adjustment mode, select the COM BIAS.
  2. Select the internal signal "flicker pattern".  # Remote control direct key: No. 19 (13 Hex).
  3. Adjust the flicker to become smallest.
  4. After adjustment, exit from the "flicker pattern" display.  # Remote control direct key: No. 19 (13 Hex).
WHITE BALANCE PRE-ADJUSTMENT
  • Feed the 0%/100% white signal.
  • In Adjustment Mode, select AWBSD ("OFF") and press "RIGHT" cursor key to start the adjustment.
  • Automatic adjustment complete when "OK" is displayed.
WHITE BALANCE ADJUSTMENT
For 40% white signal adjust RGB CUTOFF2 and for 80% white signal adjust RGB-GAIN.
Composite Signal
[Input signal] Composite video signal with picture of 80% white(Left) and 40% white(Right).
[Adjustment] Adjust the RGB CUTOFF2 and RGB-GAIN.

LAMP ERROR DETECTION 
  • This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety when the lamp or lamp circuit is abnormal.
  • If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed, the followings occur.
  • 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.)
COUNTERMEASURES
  • Check when turning OFF the lamp error detection.
  • If the power has been turned off 5 times because of lamp error, hold down the unit’s "INPUT" and "Volume (–)" key simultaneously and turn on the unit’s power switch. The TV set gets back on power in the "K" mode.
  • In this state, press the unit’s "Volume (–)" and "P [Dn] key simultaneously. The Adjustment Process mode shows up.  This enables the operation check to detect errors in the lamp or lamp circuit.
  • Check whether "ERROR NO RESET" of the adjustment process is 1 or more. If it is 1 or more, it indicates the lamp error detection was executed.
RESETTING THE LAMP ERROR COUNT
  • After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO RESET" of the adjustment process and set the number to 0 using the "LEFT" or "RIGHT" cursor key.
  • Afterwards, perform the operation check to confirm that the lamp error detection does not function.
TO ENTER HOTEL MODE
  1. Turn on the power and enter the Adjustment Process mode.
  2. Using the "up" or "down" cursor key on the remote controller, select the Hotel mode.
  3. Using the "right" cursor key on the remote controller, change the setting from "0" to "1". Now the Hotel mode shows up.
  4. Using "up" or "down" cursor key on the remote controller, select each item .  Make the setting with "left" or "right" cursor key .
  5. Finally quit the Adjustment Process mode and turn off power. The TV set comes on in the Hotel mode after the next switch-on.
HOTEL MODE SETTINGS
  1. Power on fixed (OFF ß> ON ).  When it is set to "ON", the TV is impossible to be switch off by main power switch on TV or power button on remote control .
  2. Maximum volume (0 - 60).  You can set the maximum volume at your desired level.
  3. Volume fixed (Variable ß> Fixed).  You can fix the sound volume at your desired level.  When you set "Fixed", the sound volume which you have just selected is fixed.
  4. Volume fix level (0 - 60).  If "Fixed" has been selected, you can set a fixed volume at your desired level.
  5. RC button ( à Enable <à Limited ß> Disable ß )
  6. When you set "Limited", all the other remote control keys than "power", "P (ù)/(Ù)", "volume (+)/(–)" and brightness are inoperative.
  7. When you set "Disable", the remote control keys are inoperative in their otherwise usual way.
  8. Panel button (Enable ß> Disable).  If "Disable" has been selected, the set's keys other than POWER gets disabled.
  9. Menu button (Enable ß> Disable).  If "Disable" has been selected, "menu" keys both on the set and remote control get disabled.
  10. On Screen Display (Yes ß> No).  If "No" has been selected, the On Screen Display does not appear.
  11. Input mode start ( à  Normal ß> 0 ß> 199 ß> Input2 ß> Input1 ß ).  When any other item than "Normal" has been selected, the set gets started in a selected input mode at the next power-on.
  12. Input mode fixed (Variable ß> Fixed).  If "Fixed" has been selected, any channels and input modes other than those selected in the start mode cannot be picked up.
CANCELLING HOTEL MODE
  • Turn on the power and enter the Adjustment Process mode.
  • Using the "UP" or "DOWN" cursor key, select the Hotel mode.
  • Using the "LEFT" cursor key, change the setting from "1" to "0".
  • Finally quit the Adjustment Process mode and turn off the power. The TV set comes on out of the Hotel mode after the next switch-on.
Posted By: FRANK at 03:48
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