SHARP LC-42XL2E SERVICE MODE AND POWER SUPPLY CIRCUIT

SHARP LC-42XL2E SERVICE MODE AND POWER SUPPLY CIRCUIT

SHARP LC-42XL2E 

SERVICE MODE AND POWER SUPPLY CIRCUIT 

Adjustment method after PWB and/or IC replacement due to repair
The unit is set to the optimum at the time of shipment from the factory. If any value should become improper or any adjustment is necessary due to the part replacement, make an adjustment according to the following procedure.

1. Procure the following units in order to replace the main unit, IC3301, IC8101, IC3501, IC3502, IC8301, IC8302, IC8303, or IC8304.
MAIN UNIT: DUNTKE186FM01 (LC-42/46/52XL2E)
DUNTKE186FM02 (LC-46/52XL20E)

NOTE: [Caution when replacing ICs in the main unit (IC1501/IC1502/IC1503/IC2002) or the mini av unit (IC802)]
The above ICs are EEPROMs storing the EDID data of HDMI and the monitor microcomputer. Before replacing the relevant part, procure the following parts in which the data have been rewritten.
IC2002 RH-IXB986WJN8Q Monitor microcomputer
IC802 RH-IXC284WJQZS HDMI_EXT4
IC1501 RH-IXC285WJQZS HDMI_EXT5
IC1502 RH-IXC286WJQZS HDMI_EXT6
IC1503 RH-IXC287WJQZS RGB (PC)_EXT7

2. After replacing the LCD panel or LCD control PWB, check PANEL_SIZE in the following procedure.
1) Enter the process adjustment mode.
2) Use the cursor keys UP /DOWN  and P UP/DOWN of R/C to select the item [PANEL_SIZE] on the page 33/33.
3) Verify that the panel size is displayed.
4) If the size doesn't match, select the values of the panel size with the Vol UP/DOWN keys.
5) After selection in Step 4), press the OK key, and it is completed with OK displayed.

3. After replacing the LCD panel or LCD control PWB, adjust the VCOM in the following procedure.
1) Enter the process adjustment mode.
2) Use the cursor keys UP/DOWN and P UP/DOWN of R/C to select the item [VCOM ADJ] on the page 10/33.
3) Press the OK key to verify that the adjustment pattern is displayed.
4) Use the +/- keys of VOL of L/C to adjust the flicker in the center of the screen to minimum.
5) When the optimal state is achieved in Step 4, press the OK key to turn the pattern to OFF.

4. After replacing LCD panel or LCD control PWB, perform the up/down brightness difference adjustment in the following procedure. (Note: It is applicable to LC-42/46/52XL2E only.)
1) Enter the process adjustment mode.
2) Use the cursor keys UP/DOWN and P UP/DOWN of R/C to select the item [LCD_LUMA_ADJ] on the page 10/33.
3) Press the OK key to verify that the adjustment pattern (all gray) is displayed.
4) Use the VOL +/- keys of R/C to adjust the upper/lower brightness difference in the center of the screen to minimum.
5) When the optimal state is achieved in Step 4, press the OK key to turn the pattern to OFF.

NOTE: LCD LUMA UD **< The value at the ** part is changed.
LCD LUMA DOWN 0 (Note that the value is changed if the P UP/ DOWNkeys are pressed in Step 4 above.)

Entering and exiting the adjustment process mode
1. Press the “POWER” key on the set of running TV set to force off the power.
2. While holding down the “VOL (-)” and “INPUT” keys on the set at once, plug in the AC power cord to turn on the power. The letter “K” appears on the screen.
3. Next, hold down the “VOL (-)” and “P (V)” keys on the set at once. Multiple lines of character string appearing on the screen indicate that the set is now in the adjustment Process mode. If you fail to enter the adjustment process mode (the display is the same as normal startup), retry the procedure. (Another procedure)
4. Press the “MENU” key on the main unit to display OSD.
5. Move the cursor to SERVICE (OSD) using the cursor keys on the remote control.
Then press the “MENU” key on the remote control to enter the service mode (adjustment process mode).
6. To exit the adjustment process mode after the adjustment is done, unplug the AC power cord to force off the power. (When the power is turned off with the remote controller, once unplug the AC power cord and plug it in again. In this case, wait 10 seconds or so before plugging.)

CAUTION: Use due care in handling the information described here lest the users should know how to enter the adjustment process mode. If the settings are tampered with in this mode, unrecoverable system damage may result.

Lamp error detection
1. Function
This LCD color TV set incorporates a lamp error detection feature that automatically turns off the power for safety under abnormal lamp or lamp circuit conditions. If by any chance anything is wrong with the lamp or lamp circuit or if the lamp error detection feature is activated for some reason, the following will result.
1) The power is interrupted in about 6 seconds after it is turned on.
(The power LED on the front of the TV set turns red from green and keeps blinking in red: ON for 250 ms and OFF for 1 sec.).
2) If the above phenomenon 1) occurs 5 times consecutively, it becomes impossible to turn on the power. (The power LED remained red).
2. Measures
1) Checking with lamp error detection OFF
Enter the adjustment process mode, referring to 1. Entering and exiting the adjustment process mode. If there is a problem with the lamp or lamp circuit, the lamp will go out. (The power LED is green.) Then, you can check the operation to see if the lamp and lamp circuit are in trouble.
2) Resetting the lamp error count
After the lamp and lamp circuit are found out of trouble, reset the lamp error count. If a lamp error is detected five consecutive times, the power cannot be turned on. Using the cursor (UP/DOWN) key, move to the cursor to [LAMP ERROR RESET], Line 8 on adjustment process mode service page 2/33. With the cursor (LEFT/RIGHT) keys, select the [LAMP ERROR RESET] value. Finally press the cursor (OK) eys to reset the value to “0”.

Public Mode (Hotel Mode)
1. Starting the Public Mode
• There are two following ways to display the PUBLIC Mode setting screen.
1) On the process adjustment mode screen (2/33), set the “HOTEL MODE” Flag to ON. Turn off the power, and turn it on again, pressing the CHANNEL UP and VOLUME UP keys of the main unit at the same time.
2) Enter the Pass Word, and start the unit.
a) Turn on the power, pressing the INPUT and VOLUME UP keys of the main unit at the same time.
b) Display the Pass Word input screen.

Operation procedure
• The initial input position is the digit at the left end.
• For the numeric keys 0 to 9 of R/C, key input is accepted. Input of the other keys is prohibited.
• Change “-” to “*” by inputting the numeric key at the input position, and shift the input position rightward one digit.
• When three digits are completely input, the Pass Word is judged.
c) Check the Pass Word by inputting three digits.
If the Pass Word is 027 , it shifts to the PUBLIC Mode setting screen.
In another case, the screen is erased, and it operates in the ordinary mode.

Exiting the Public Mode screen
• There are two following ways to exit the Public Mode setting screen.
1) Turn off the power.
2) Select “Execution” in the PUBLIC_Mode to execute it.
Activate the restart under the set content. Here, the START input SOURCE setting is excluded since this item is referred to only when the power is turned on.
3. Set value of the Public Mode
• Each set value in the PUBLIC Mode is initialized when the factory setting is applied.
(The setting of the PUBLIC MODE Flag in the process adjustment mode screen is not changed.)

Operation after “RESET”
Select “RESET” in the PUBLIC Mode, and it operates as follows when it is executed (refer to the basic operation).
• The set contents in the PUBLIC mode are initialized.
• It does not exit the PUBLIC mode.
• PUBLIC MODE Flag does not change. (It is not set to OFF.)

POWER SUPPLY CIRCUIT 

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