Tuesday, November 24, 2015

JVC LT-37A80ZU - LT-37DA8BJ SERVICE MODE AND POWER SUPPLY CIRCUIT

JVC LT-37A80ZU - LT-37DA8BJ 

SERVICE MODE AND POWER SUPPLY CIRCUIT 

SYSTEM SETTING
(1) Press the [INFORMATION] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [9].
(3) The screen  is displayed, and the SYSTEM SETTING starts.
NOTE:
When the SYSTEM SETTING is performed, all settings are reset to the factory setting. Perform the setting again.
FEATURES
DIGITAL TUNER [DA8 series only]
This TV can receive both DVB-T (Digital terrestrial broadcasting) and Analogue terrestrial broadcasting.
HDMI INPUT
By connecting a HDMI compatible device, high definition pictures can be displayed on your TV in their digital form.
MOVIE THEATRE
This function displays a cinema film picture more smoothly and naturally on the screen.
DIGITAL VNR
This function cuts down the amount of noise in the original picture. 3D Cinema Sound
You can enjoy sounds with a wider ambience
TECHNICAL INFORMATION
LCD PANEL

This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.
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.
MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting values.
3. Power on
Connect the power plug to the AC outlet and switch on the power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
5. User setting
Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is necessary
ADJUSTMENT PREPARATION
(1) This TV is adjusted by using REMOTE CONTROL UNIT.
(2) The adjustment using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
(3) Make sure that connection is correctly made AC to AC power source.
(4) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.
(5) If the receive or input signal is not specified, use the most appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service
adjustment..
HOW TO ENTER THE SERVICE MODE
(1) Press [INFORMATION] key and [MUTING] key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN
CHANGE AND MEMORY OF SETTING VALUE SELECTION OF SETTING ITEM
# [FUNCTION UP / DOWN] key.
For scrolling up / down the setting items.
CHANGE OF SETTING VALUE (DATA)
# [FUNCTION LEFT/RIGHT] key.
For scrolling up / down the setting values.
MEMORY OF SETTING VALUE (DATA)
Changed setting value is memorized by pressing [OK] key
ADJUSTMENT MODE
This mode is used to adjust the VIDEO CIRCUIT.
HOW TO ENTER THE ADJUSTMENT MODE
When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE .
NOTE:
# When a number key other than the [1] key is pressed in the SERVICE MODE SCREEN, the other relevant screen may be displayed.
This is not used in the adjustment procedure. Press the [MENU] key to return to the SERVICE MODE SCREEN.
INITIAL SETTING VALUES IN THE SERVICE MODE
# Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.
# The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved may be different from the default values.
WHITE BALANCE (HIGHLIGHT)
(1) Receive a PAL 75% all white signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set ZOOM to "FULL".
(4) Set COLOUR TEMP. to "NORMAL".
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Adjustment is select 1 item from <2.R DRIVE>,
<3.G DRIVE> and <4.B DRIVE> then select item fix to "920" Other color shold be less than 920.
NOTE:
Finaly minimam more than 1 item (<2.R DRIVE>, <3.G DRIVE> or <4.B DRIVE>) should be "920".
(7) Must check white balance adjustment correctry with low light to high light.
(8) Press the [OK] key to memoirze the set value.
HOW TO ENTER THE SELF CHECK MODE
Before enter the SELF CHECK MODE, press the [MODE] key to confirm that "TV" position is indicated. If it is in a wrong position,
the SELF CHECK MODE operation cannot be performed.
(1) Press the [INFORMATION] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) Press the [2] key SELF CHECK MODE.
(3) Press the [RED] key to enter Page 2 of the SELF CHECK MODE.
Use the [GREEN] key to toggle between Page 1 and Page 2.
HOW TO EXIT THE SELF CHECK MODE
To Save Failure History:
Turn off the power by unplugging the AC power cord plug when in the Self check display mode.
To Clear (Reset) Failure History:
Turn off the power by pressing the [POWER] key on the remote control unit when in the Self check display mode.
FAILURE HISTORY
Failure history can be counted up to 9 times for each item. When the number exceeds 9, display will remain as 9. Failure history will be stored in the memory unless it has been deleted.
NOTE:
Only SYNC (with/without sync signals) will be neither counted nor stored.
POWER SUPPLY CIRCUIT 
CLICK ON THE IMAGE TO ZOOM IN