JVC LT-52GZ79 Service Manual page 5

1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)
(1) Avoid placing the unit under direct sunlight over a
prolonged period of time. This may cause the optical filter
to deteriorate in quality and COLOUR.
(2) Clean the filter surface by wiping it softly and lightly with a
soft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe the
filter surface. This may cause the filter to deteriorate in
quality or the coating on the surface to come off. When
cleaning the filter, usually use the neutral detergent diluted
with water. When cleaning the dirty filter, use water-diluted
ethanol.
(4) Since the filter surface is fragile, do not scratch or hit it with
hard materials. Be careful enough not to touch the front
surface, especially when taking the unit out of the packing
case or during transportation.
1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR
PARTS
Take note of the following when replacing exterior parts (REAR
COVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filter
surface). It may cause irregular COLOUR.
(2) Pay careful attention not to scratch or stain the front of the
LCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) should
be placed facing downward. Place a mat, etc. underneath
to avoid causing scratches to the front (filter surface).
1.3.4 HOW TO CHECK THE OPERATING TIME
This model has a function to count and record the LCD panel
operating time. The operating time can be checked in the
following procedure.
• Maximum count time = 131070 hours
(1) Press the [DISPLAY] key and [MUTING] key simulta-
neously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(3) The operating time of the LCD panel is displayed in 5-digit
decimal number.(Refer to the below figure)
SERVICE MODE SCREEN
SERVICE MENU SERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
Press [2] key
Switch the display/ non-display
with the [ZOOM] key.
SELF CHECK MODE SCREEN (Page 1)
The operating time is displayed
LOB LOB 0 0
AUD AUD 0 0
ANA ANA 9 9
HOUR HOUR 131070 131070
RESET : TV RESET : TV
MAX is displayed when the maximum
count time is exceeded
*When the power is turned off with the remote control unit or the power
button of the main unit, the count restarts from the turn off time.
*When the power is turned off by disconnecting the power cord from the
AC outlet, the recorded time count less than 2 hours is not counted.
*When the operating time exceeds the maximum count time, "MAX" is
displayed to the right of the counted time, and the following count is
discontinued.
1.3.5 HOW TO RESET THE OPERATING TIME
(1) Press the [MENU] key simultaneously, then enter the
USER MENU.
(2) Select the "Features" from the USER MENU.
(3) Select the Blue back from the Features.
(4) Set the Blue back to "Off".
(5) Press the [DISPLAY]
simultaneously, then enter the SERVICE MODE.
(6) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(7) When the self check screen(page-1) is displayed, press
[ZOOM] key.
(8) "RESET : TV" is displayed under the operating time.
(9) Press the [TV/VIDEO] key to reset the operating time.
NOTE:
When the LCD PANEL UNIT is replaced, be sure to reset the
operating time following the above method.
FAN FAN 0 0
DIG DIG 9 9
MAX MAX 0 0
1 1
key and [MUTING] key
(No.YA665<Rev.001>)1-5