SHARP LC-32LX700 - LC-40LE700E - LC-46LE700 - LC-52LE700 - Service mode - Lamp error detection - Factory reset - LED Television repair and service

Category: LED Television repair and Service 

Contents of this article

• Service mode access
• Lamp error detection and reset
• white balance adjustment
• Factory reset 

SHARP LC-32LX700 - LC-40LE700E - LC-46LE700 - LC-52LE700

ADJUSTMENT PROCEDURE
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, IC3302
MAIN Unit: DUNTKF306FM01
NOTE: [Caution when replacing ICs in the main unit (IC501,IC2002)]
The above ICs are EEPROMs storing the EDID data of PC, and Monitor microcomputer.
Before replacing the relevant part, procure the following parts in which the data have been rewritten.

IC501 RH-iXC697WJQZS PC
IC2002 RH-iXC786WJN5Q Monitor microcomputer

2. After replacing the LCD panel or LCD control UNIT, check PANEL_SIZE in the following procedure.
1) Enter the process adjustment mode in AVC.
2) Use the cursor keys ( UP/DOWN ) and P keys (UP/DOWN) of R/C to select the item [PANEL_SIZE] on the page 17/17.
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(+/-) 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 10/17.
3) Press the OK key to verify that the adjustment pattern is displayed.
4) Use the +/- keys of VOL of R/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.
Entering and exiting the adjustment process mode
1. Unplug the AC power cord 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 ( DOWN

Special features
1. NORMAL STANDBY CAUSE (Page 1/17)
Display of a cause (code) of the last standby.
The cause of the last standby is recorded in EEPROM whenever it is possible.
Checking this code will be useful in finding a problem when you repair the troubled set.
2. EEP SAVE (Page 17/17)
Storage of EEP adjustment value
3. EEP RECOVER (Page 17/17)
Retrieval of EEP adjustment value from storage area

Lamp error detection
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 500ms 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 300ms and OFF for 1500ms.).
2) If the above phenomenon 1) occurs 5 times, it becomes impossible to turn on the power. (The power LED remained red).
Measures
1) Checking with lamp error detection OFF
Enter the adjustment process mode, referring to 2. 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.
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 2/17.
With the cursor (LEFT/RIGHT) keys, select the [LAMP ERROR RESET] value. Finally press the cursor (OK) eys to reset the value to “0”.
Table of contents of adjustment process mode Page 2/17)” keys on the set at once.
Multiple lines of blue characters 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.
4. 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.)

White balance adjustment

For white balance adjustment, adjust the offset values on pages 12/17.

[Condition of the unit for inspection]: PC mode, Modulated light (+16), Color temperature (High)

[Input signal condition]: HDMI 1080i 15IRE(LO), 78IRE(HI)

[Adjustment reference device]: Minolta CA-210

[Adjustment procedure]

1) Display the current adjustment status at R/G/B_GAIN(HI). (Page 12/17 of process adjustment)

The signal of 78IRE is input.

2) Read the value of the luminance meter. x=0.272, y =0.277

3) Change R_GAIN(HI)/ B_GAIN(HI) (Adjustment offset value) on page 12/17 of process adjustment so that the values of the luminance meter approach x=0.272 and y =0.277.

(Basically, G is not changed. If adjustment fails with R and B, change G. When G is lowered, the weaker of R or B must be fixed.)

4) Display the adjustment status of the current R/G/B_GAIN(LO).

The signal of 15IRE is input.

Change R_GAIN(LO)/ B_GAIN(LO) (adjustment offset value) on page 12/17 of process adjustment so that the values of the luminance meter approach x =0.272 and y = 0.277.

5) Both HI and LO are repeating the step from 1 to 4 until becoming an aim value.

[Adjustment reference standard value]

Adjustment spec ± 0.002 Inspection spec ± 0.004 (point LO)

Adjustment spec ± 0.001 Inspection spec ± 0.002 (point HI)

6) After completing adjustments, set EEP SAVE (17/17) to ON in the process menu to save the white balance adjustment value.

Initialization to factory settings

[Factory setting with adjustment process mode]
# Enter the adjustment process mode.
# Move the cursor to [INDUSTRY INIT] on page 2/17.
# Use the R/C key to select a region from [EUROPE/RUSSIA/SWEDEN] and press the [OK] key.
# “EXECUTING” display appears.
# After a while, “SUCCESS” display appears, the setting is completed.
When succeeding: Background color (green)
When failing: Background color (red)
The following items are initialized in the factory setting.
1) User settings
2) Channel data (e.g. broadcast frequencies)
3) Maker option setting
4) Password data