Saturday, February 20, 2016

SHARP LC-52DH77 - Service mode – Adjustment process mode – Lamp error detection – White balance adjustment – Software upgrade – LCD Television repair and service

Category: LCD television Repair and Service 

Contents of this article 

  • Adjustment process mode
  • Firmware update
  • White balance adjustment   



SHARP LC-52DH77

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: DUNTKF190FM01
NOTE: [Caution when replacing ICs in the main unit (IC501, IC1504, IC2002)]
The above ICs are EEPROMs storing the EDID data of PC, HDMI 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-iXC786WJN1Q 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 16/16.
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 10/16.
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)” 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.)
Lamp error detection
Function
This LCD colour 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 300ms and OFF for 1500ms.).
2) If the above phenomenon 1) occurs 5 times consecutively, 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 2/16.
With the cursor (LEFT/RIGHT) keys, select the [LAMP ERROR RESET] value. Finally press the cursor (OK) eys to reset the value to “0”.
White Balance Adjustment
[Adjustment procedure]
1) Transmit the “monitor adjustment process” code using the remote control.
2) Set the point 6 to the specified gradation, specify the strongest color as thefixed color, and adjust the RGB so that it becomes the standard value through negative adjustment.
3) Set the point 5 to the specified gradation, set the G correction value (3200 x G value of point 6/3712) (fractions rounded off), and adjust the RB so that it becomes the standard value.
4) Set the point 4 to the specified gradation, set the G correction value (2176 x G value of point 6/3712) (fractions rounded off), and adjust the RB so that it becomes the standard value.
5) Set the point 3 to the specified gradation, set the G correction value (1824 x G value of point 6/3712) (fractions rounded off), and adjust the RB so that it becomes the standard value.
6) Set the point 2 to the specified gradation, set the G correction value (1248 x G value of point 6/3712) (fractions rounded off), and adjust the RB pattern so that it becomes the standard value.
7) Set the point 1 to the specified gradation, set the G correction value (768 x G value of point 6/3712) (fractions rounded off), and adjust the RB so that it becomes the standard value.
8) Write the adjustment value by the MSET0003 command and turn off the AC power.
* RGB initial value of point 6: Set gradation 3712
* RGB initial value of points 1 to 5: G correction value of each point
(At each point, adjustment is made so that the remainder of the RGB adjustment value/4 is equal.)
Initialization to factory settings
In INDUSTRY INIT of the process page No. [2/16], select the destination [EUROPE / RUSSIA / SWEDEN] using the [R/C] Volume +/- keys, and press the [R/C] OK key.
“///////////” is displayed, and then “SUCCESS ----- Destination” appears to complete the setting.
Success: Background color [Green] / Failure: Background color [Red]
Upgrading the software
1. Turn off the AC power (Unplug the AC power cord).
2. Insert the upgrading USB flash memory for upgrade into the service slot.
3. While holding down the power button, plug in the AC power cord of the main unit to turn on the power.
4. Upgrade begins automatically. After the set starts, the upgrade screen
5. If any of the procedures fails, the following upgrade failure screen shows up. For the failing procedure, the “NG” marking turns red.
NOTE: In such case, try to upgrade the software again. If it still fails, the hardware may be in trouble.
6. When all the procedures are complete, the following upgrade success screen shows up. The new software version can be confirmed on screen.
The version number appears when each item has been successfully upgraded. Finally the main version number appears on screen.
7. Turn off the AC power (Unplug the AC power cord). Take out the upgrading USB flash memory. It waits for about 20 seconds until the AC power supply is turned off.
8. Now the software has been upgraded.
NOTE: Then get the set started and call the process adjustment screen 1/16 to check the main software version. 
CAUTION: 
1) Do not take out and put in the USB flash memory during formatting.
2) It takes about one minute to the rewriting completion. Please confirm the upgrade status on the screen becomes 100%.
3) The AC power supply of the set is waited for about 20 seconds until off (The AC outlet is pulled out) after the upgrade is completed.