Sharp LCD tv service modes – Vcom adjustment – Factory reset - Sharp LC-46A77 - LC-52A77 - LCD television repair and service

Category: LCD television Repair and Service 

Contents of this article 

• How to access to service mode 
• Factory Reset procedure 
• LCD panel Adjustments 

Sharp LC-46A77 - LC-52A77 

Entering the adjustment process mode
There are 3 ways as follows:
• After power-on, press "ADJUSTMENT PROCESS" key of the remote control.
• With the KEY 4 (pin E1 of IC801) set to "L", turn the power ON.
• During servicing

1.While holding down the TV/VIDEO and Volume DOWN keys at the same time, set the Power switch to ON. (“K” standing for inspection process mode is displayed in the upper left portion of the screen.)

2. Press the Channel DOWN and Volume DOWN keys at the same time. (The adjustment process mode screen appears.)

Key operation in the adjustment process mode
1. Basic operations
• Tune in to a station using the Channel UP/DOWN keys.
• Switch the input using the TV/VIDEO key.
• Select an item to adjust using the Cursor UP/DOWN keys. (Pressing the Cursor DOWNkey while at the bottom item moves to the top item on the next page, and pressing the Cursor UP key while at the top item moves to the bottom item on the previous page.)
• Adjust the item selected using the Volume +/– or Cursor LEFT /RIGHT keys.
• Press the Menu key to move to the next item. (Pressing the Menu key while at the bottom item moves to the top item on the next page.)
• Press the Manual Memory key to return to the top item. (Pressing the Manual Memory key while at the top item moves to the top item on the previous page.) Press the Auto Preset key to move to the top item on the next page.
2. Layer movement
• Pressing the ENTER key while at an item other than I2C DATA and HOTEL POWERFIX on page 2 moves to the setting page of that item name.
• Press the Flashback key to exit each setting page.
3. Adjustment procedure for RGTAR, GGTAR and BGTAR items on pages 3, 4, and 5 of the DVP layer
• At RGTAR, GGTAR, and BGTAR on pages 3, 4, and 5; pressing the Volume UP/DOWN or the Cursor LEFT/RIGHT keys moves left or right.
Select an item to adjust, and press the Direct Channel "12" key.
As the Cursor moves to the corresponding right field, make adjustments using the Volume UP/DOWN or the Cursor UP/DOWN keys. Pressing the Direct Channel "12" key at the right field moves back. Pressing the Cursor / keys, the Menu key, etc. moves to a different item.
Initialization
Pull down the pin E1 & F3 of IC2001 to GND, then turn on the power.
Check MODEL (A654MA).
Inch Size Setting
1. Enter Adjustment process Mode
2. Press volume down and channel up simultaneously. This will bring cursor RIGHT to 'INCH SIZE'.
3. To set inch size '32', press '1' on remote control. This will change 'INCH SIZE' to purple color for 25sec.
4. Cursor RIGHT then will go up to 'MODEL'. If yellow highlight is still remain at 'INCH SIZE', process inch size setting is NG. Check the hardware inch size selection.

Adjusting the LCD panel
When replacing the LCD control PCB, follow these steps to adjust VCOM.
1. Enter the adjustment process mode.
2. Select the item [VCOM ADJ] using the Cursor ( UP/DOWN /LEFT /RIGHT ) or CH (UP /DOWN ) keys on the remote controller.
3. Press the OK key to check that the adjustment pattern is displayed.
4. Adjust the flicker in the middle of the screen to minimum using the Cursor ( LEFT/RIGHT ) or CH (UP /DOWN ) or VOL (+)/(-) keys on the remote controller.
5. Press the OK key to turn off the pattern.
6. To exit the adjustment process mode after the adjustment is done, unplug the AC cord from the outlet to make a forced shutdown. (When thepower was turned off with the remote controller, once unplug the AC cord and plug it again. In this case, wait 10 seconds or so before plugging.)
CAUTION: Use due care in handling the information described here lest your users should know how to enter the adjustment process mode.If the settings are tampered in this mode, unrecoverable system damage may result.

Factory setting
Performing the factory setting using the remote control for adjustment
1. Perform the factory setting using the remote control for adjustment. (This setting must be done after the MCL data setting.)
2. “M” stands for factory setting 2, “X” stands for factory setting 4 is displayed in the upper left portion of the screen by continuing to press the ‘Factory Setting’ key on the remote control for adjustment.

3. When “SETTING COMPLETE” is displayed in the middle of the screen after a few seconds, setting is completed.

4. Turn off the power.
NOTE: Set the Power switch to “OFF” immediately after completing the factory setting.
CAUTION: Do not plug on again after shipment setting is done. If do, please re-do the shipment setting. Do not power off with remote control.

PUBLIC MODE SETTING PROCEDURE

How to start Public Mode
• There are the following two ways to get the public mode setup screen displayed.

1) Press the “INPUT” and “VOL (+)” keys on the set at once and turn on the power.
2) Get the password input screen displayed.

Procedure

• The input starts with the leftmost digit.
• Use the numeric keys [1] thru [9] and [10/0] keys on the remote controller. The other keys are not acceptable.
• With a numeric-key input ”- ” will change to”* ”The input position will move one digit to the right.
• With all the 3 digits entered, the password will be verified.

3) The 3-digit password is now verified.
The password [0] [2] [7] provides for the public mode screen. (This screen comes on with whatever adjustment process settings.) With any other passwords, the screen changes to the normal mode.

In the adjustment process mode, turn on “PUBLIC MODE”. Also press the “CH (UP )” and “VOL (+)” keys on the set at once and turn on the power.

How to exit Public Mode
There are the following ways to quit the public mode setup screen.
• Turn off “PUBLIC MODE” in the adjustment process mode. (*) . This way alone is not for quitting the setup screen, but for quitting the mode itself.
• Turn off the power with the “POWER” key. ( * )
• Select “ENTER”. ( * )
• Move the cursor to “RESET” and press the “FLASHBACK” key. (Back to the normal mode screen)