Thursday, January 14, 2016

SHARP LC-37XD1E Service mode – VCOM adjustment – Troubleshooting – LCD television Repair and service

Category: LCD Television Repair and Service 

Contents of this article 

  • Service modes access 
  • VOM adjustment
  • Troubleshooting 



SHARP LC-37XD1E

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.)
Adjustment
When replacing the LCD control PCB, follow these steps to adjust VCOM.
Before starting the VCOM adjustment
1) Check the connecting cable shown in the figure.
For this connecting cable, either QCNW-E599WJQZ or QCNW-F046WJQZ is used depending on the production lot.
2) When using QCNW-E599WJQZ, replace it with QCNW-F046WJQZ to perform VCOM adjustment.
After the adjustment, reconnect QCNW-E599WJQZ.
(For the service jig, refer to LC-37XD1E/RU No.S47E1LC37XD1E.)

Method of VCOM adjustment
1) Enter the adjustment process mode.
2) Select the item [VCOM ADJ] using the cursor ( LEFT/RIGHT / UP/ DOWN) or P (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 P ( UP)/( DOWN) 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 the power 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.)
TROUBLESHOOTING
PROBLEM Some modern HDMI devices are displaying no picture and no sound when connected to the TV via HDMI.
CAUSE Upon investigate it has been found that 2 possible issues can cause this problem:
1. Supplied HDMI cable – HDMI cables have been pinned out and discovered that they are not fully wired and / or wired incorrectly
2. The device is not backwards compatible with the HDMI specification
SOLUTION
1. Try a different and known working HDMI cable
2. Add a HDMI device in the middle of the connection that outputs a fully compatible HDMI signal.
Example 1 – A home cinema amplifier
Example 2 – A HDMI splitter