Sunday, January 10, 2016

JVC LT-32DE9BJ service mode – service adjustments – pixel fault- sub contrast adjustments – LCD Television repair and service

Category: LCD Television Repair and service 

Contents of this article 

  • How to enter to service mode 
  • Sub contrast adjustment 
  • Memory IC replacing procedure  



JVC LT-32DE9BJ

REPLACEMENT OF MEMORY IC
This unit uses the nonvolatile memory IC.The memory IC memories data for video and deflection circuits. To replace the memory IC without the data written, malfunctions might occurred while power is on, and the normal image might not appear. When replacing the memory IC, be sure to use the IC written with the initial values of data.
PROCEDURE FOR REPLACING THE MEMORY IC
(1) Switch the power off and unplug the power cord from the wall outlet.
(2) Replacing the memory IC. [Be sure to use the IC written with the initial values of data]
(3) Plug the power cord into the wall outlet and switch the power on.
(4) Check and setting of SYSTEM CONSTANT SET
a) Press the [INFORMATION] key and [MUTING] key on the remote control unit simultaneously. The SERVICE MENU screen will be displayed.
b) In the SERVICE MENU, press the [INFORMATION] key and [MUTING] key simultaneously.
Then, the SYSTEM CONSTANT SET screen will be displayed.
c) Check whether the setting value of the SYSTEM CONSTANT SET.
d) Press the [INFORMATION] key twice to return to the normal screen.
(5) Receive channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels.
(6) User setting
Memories the user setting items.The [USER SETTINGS OF MENU] setting.
(7) Setting of SERVICE MENU
Check the setting items in the SERVICE MENU, set if necessary.
SETTING OF VSM PRESET
(1) Enter "5.VSM PRESET" from the SERVICE MENU.
(2) Press the [OK] key to select BRIGHT/STD/SOFT/COOL/NORMAL/WARM mode.
(3) Select the setting item using the [FUNCTION (UP/DOWM)] key.
(4) Set the value using the [FUNCTION (+/-)] key.
(5) Press the [OK] key to memorize the set value.
(6) Press the [INFORMATION] key twice to return to the normal screen.
ADJUSTMENT PREPARATION
(1) Prior to the following procedure, be sure to connect the receiver unit and the display unit.
(2) Adjustment of many Majority of the adjustment items for this unit is performed using the remote control.
(3) However, adjustment of some adjustment items is performed in the conventional way, i.e. with components on the boards.
(4) Ensure that the power supply is AC220V.
(5) Allow the set and the measuring devices to run for at least 30 minutes.
(6) Do not alter settings of items/preset values on the service screen that are not stated in this manual.

Setting item
Settings
PICTURE MODE
STANDARD
PICTURE adjustment
All center (00)
COLOUR TEMP.
NORMAL
DIGITAL VNR
MIN
Super Digi Pure
AUTO
SOUND adjustment
All center (00)
BBE
OFF
A.H.B
OFF
ZOOM
FULL

HOW TO ENTER THE SERVICE MENU MODE
(1) Press the [INFORMATION] key and the [MUTING] key of the REMOTE CONTROL UNIT simultaneously, and the SERVICE MENU screen of  will be displayed.
(2) When the Main Menu is displayed, press any key of the [1] to [0] key to enter the corresponding menu mode.

*Press any of the [1] to [0] keys before the Service Menu mode disappears.
(3) Select the service item using the [FUNCTION (UP/DOWN)] key.
(4) Set the value using the [FUNCTION (LEFT/RIGHT] key.
(5) Press the [OK] key to save the value.
HOW TO EXIT THE SERVICE MENU MODE
Press the [INFORMATION] key to exit the Service Menu mode.
V/C (VIDEO setting)
[Do not change settings of items that are not included in the "ADJUSTMENT PROCEDURE".]
Sets output data to the video circuit.
# [Function (UP/DOWN)] key
For scrolling up/down the setting items.
# [Function LEFT/RIGHT)] key
For scrolling up/down the setting values.
AUDIO (SOUND setting)
[Do not adjust]
DD/CM (Panel picture processing setting)
[Do not change settings of items that are not included in the "ADJUSTMENT PROCEDURE".]
Sets output data to the deflection circuit.
# [Function (UP/DOWN)] key
#  [Zoom (red)] key
For switching to the next item.
# [Function (LEFT/RIGHT)] key
For scrolling up/down th) setting values.
STATUS
(The version of software, the aspect, and the state of debugging are displayed. ) [Setting for this item is not required in servicing]
VNR (Noise reduction setting)
[Do not adjust]
Sets output data to the digital noise reduction circuit.
IP (DIST setting)
[Do not adjust]
Sets output data to the DIST circuit.
SHIPPING (OFF)
[Setting for this item is not required in servicing]
BUE FREE
[Setting for this item is not required in servicing]
SUB CONTRAST
PAL COLOUR
(1) Receive a PAL colour bar signal (full field colour bar).
(2) Select "2. V/C" from the SERVICE MENU.
(3) Adjust < 13. COLOUR > (Colour) to set the red colour of the colour bar signal to be the reddest. If noise is not completely deleted, adjust < 13. COLOUR > so that the red colour has the minimum noise.
NOTE:
If you select an adjustment item < 13. COLOUR >, then the screen turns to an adjustment screen
(4) Press the [OK] key to memorize the set value.
(5) Press the [INFORMATION] key twice to the normal screen.
SECAM COLOUR 
(1) Receive a SECAM colour bar signal (half colour bar).
(2) Select "2. V/C" from the SERVICE MENU.
(3) Make similar adjustment of SECAM COLOUR in the same way as for "PAL COLOUR".
NTSC COLOUR
(1) Input a NTSC 3.58 composite colour bar signal (full field colour bar 75% white).
(2) Select "2. V/C” from the SERVICE MENU.
(3) Make similar adjustment of NTSC COLOUR in the same way as for "PAL COLOUR". (See Fig.6)
(4) Input a NTSC 4.43 composite colour bar signal (full field colour bar 75% white), and then check the red colour of the colour bar signal and confirm that there is no noise or the minimum noise.
PIXEL FAULT
There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.
BRIGHT FAULT
In this pixel fault, a cell that should not light originally is lighting on and off. For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
DARK FAULT
In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting. For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
FLICKER FAULT
In the pixel fault, a cell that should light originally or not light originally is flashing on and off.
For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on and off.