Thursday, January 14, 2016

SHARP LC-32DH66E -LC-37DH66 -LC46DH66E - LC52DH66E - Service mode - Lamp error detection - Lamp reset - Trouble shooting - Lcd Television Repair and service

Category: LCD Television Repair and Service 

Content of this article

  • Accessing service mode 
  • Lamp error detection
  • Lamp reset 
  • Troubleshooting 


SHARP LC-32DH66E - LC-37DH66- LC-46DH66E - LC-52DH66E

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, IC8101, IC5001, or IC5003.
MAIN UNIT: DUNTKE685FM01 (LC-32D65E/RU)
DUNTKE685FM03 (LC-37D65E/RU)
NOTE: [Caution when replacing ICs in the main unit (IC1504)]
The above ICs are EEPROMs storing the EDID data of HDMI. Before replacing the relevant part, procure the following parts in which the data
have been rewritten.
IC1504 RH-IXC442WJN1S EDID (HDMI)
IC1503 RH-IXC697WJQZS EDID (PC)
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 and P 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 and P 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.
4. After replacing LCD panel or LCD control PWB, perform the up/down brightness difference adjustment in the following procedure.
1) Enter the process adjustment mode.
2) Use the cursor keys UP and P DOWN of R/C to select the item [LCD_LUMA_ADJ] on the page 10/16.
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 UP ** The value at the ** part is changed.
LCD LUMA DOWN 0 (Note that the value is changed if the P UP / DOWN keys are pressed in Step 4 above.)
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
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 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).
2. 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.
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 2/16. With the cursor (</>) keys, select the [LAMP ERROR RESET] value. Finally press the cursor (OK) eys to reset the value to “0”.
TROUBLESHOOTING
SYMPTOM : Unit enters trip mode. Green LED illuminates then the set goes to standby a few seconds later.
CAUSE : Lamp error counter reaching maximum limit. If the lamp counter is reset, the set will work until the limit is reached again.
ACTION : It has been found that any of the lamps within the LCD panel may not be fitted correctly and cause’s the lamp to function intermittently and an error is then produced. Carefully and in a clean environment remove the LCD panel from the cabinet fascia and then remove the LCD glass sheet and diffuser to expose the backlights. Look at the lamp connections within the back panel and ensure the lamp metal contacts are correctly located


The Lamp contact in Figure 1 is only sitting on the edge of the end clamp, Figure 2 shows a correctly fitted lamp
SYMPTOM: Green LED and No backlights.
CAUSE : Corrupted firmware.
ACTION : Install the latest firmware as detailed in the service manual using a USB stick, then enter the service mode and ensure the necessary adjustments for screen size etc are
reset.