JVC LT-42DV1BJ
SERVICE MODE AND POWER SUPPLY CIRCUIT
ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.
(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.
(1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.
(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.
PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.
Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.
|
Setting
item
|
Settings
position
|
|
Picture Mode
|
Standard
|
|
Picture Adjustments
|
Centre
|
|
Colour Temp.
|
Normal
|
|
Super Digipure
|
Auto
|
|
Movie Theatre
|
Auto
|
|
Colour Management
|
On
|
|
Picture Management
|
On
|
|
Zoom
|
Full
|
MEASURING INSTRUMENT
AND FIXTURES
• Signal generator (Pattern generator) [PAL]
• Remote control unit
• Signal generator (Pattern generator) [PAL]
• Remote control unit
BASIC OPERATION OF SERVICE MODE
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.
(2) In the SERVICE MENU, press the [1] key to display ADJUSTMENT MODE SCREEN
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.
(2) In the SERVICE MENU, press the [1] key to display ADJUSTMENT MODE SCREEN
HOW TO EXIT THE SERVICE MODE
Press the [BACK] key to exit the Service mode.
Press the [BACK] key to exit the Service mode.
SERVICE MODE ITEMS
ADJUSTMENT MODE
This mode is used to adjust the VIDEO CIRCUIT.
HOW TO ENTER THE ADJUSTMENT MODE
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.
COLOUR TEMP.
(2) SETTING ITEM NAME
Setting item name are displayed.
(3) SETTING ITEM NO.
Setting item numbers are displayed. The setting item numbers to be displayed are listed below.
(2) SETTING ITEM NAME
Setting item name are displayed.
(3) SETTING ITEM NO.
Setting item numbers are displayed. The setting item numbers to be displayed are listed below.
|
Item No
|
Item
|
Variable range
|
Setting value
|
|
S001
|
R DRIVE
|
000 - 255
|
000
|
|
S002
|
G DRIVE
|
000 - 255
|
000
|
|
S003
|
B DRIVE
|
000 - 255
|
000
|
(4) SETTING VALUE
(DATA)
The SETTING VALUE is displayed.
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 [MUTING] key.
The SETTING VALUE is displayed.
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 [MUTING] key.
MONITOR MODE
This mode displays the signal status of channel that has been selected now.
SYSTEM CONFIGRATION
This mode selects the function that can be used by the user menu.
SOFTWARE UPDATE
This mode updates the version of software.
I2C STOP MODE [NO DISPLAY]
This mode is unused.
EDID WRITE PROTECT
This mode sets memory with EDID data to write protection.
HDMI_EQ SETTING
This mode switches HDMI1.3 compliant and AWG28.
SOFTWARE VERSION CHECK
This mode displays the version of microcomputer software and memory.
SOUND CALIBRATION SETTING
This mode sets SOUND CALIBRATION.
This mode displays the signal status of channel that has been selected now.
SYSTEM CONFIGRATION
This mode selects the function that can be used by the user menu.
SOFTWARE UPDATE
This mode updates the version of software.
I2C STOP MODE [NO DISPLAY]
This mode is unused.
EDID WRITE PROTECT
This mode sets memory with EDID data to write protection.
HDMI_EQ SETTING
This mode switches HDMI1.3 compliant and AWG28.
SOFTWARE VERSION CHECK
This mode displays the version of microcomputer software and memory.
SOUND CALIBRATION SETTING
This mode sets SOUND CALIBRATION.
ADJUSTMENT PROCEDURE
|
Item
|
Measuring
instrument |
Adjustment part
|
Description
|
|
SOUND
CALIBRATION |
Remote control unit
|
[9. Calibration Setting]
|
(1) Receive any bilingual broadcast.
(2) Select "9. Calibration Setting" from the SERVICE MODE. (3) Press the "OK" key to start the calibration. (4) After "Finish" is displayed, press the [MENU] key to exit the menu. |
|
WHITE BALANCE
(HIGHLIGHT) |
Remote control unit
Signal generator |
[1. Adjust]
S001: R DRIVE (Red drive) S002: G DRIVE (Green drive) S003: B DRIVE (Blue drive) |
(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) Adjust to Keep one of <S001> (Red drive), <S002> (Green drive) or <S003> (Blue drive) unchanged, then lower the other two so that the all white screen is equally white throughout. NOTE: Set one or more of <S001>, <S002>, and <S003> to "000". (7) Check that white balance is properly tracked from low light to high light. If the white balance tracking is deviated, adjust to correct it. (8) Press the [MUTING] key to memorize the set value. |
SELF CHECK FUNCTIONS OUTLINE
This model has a "Self-diagnosis function," which checks the operation state of the circuits inside the set, and informs us of a failure.
Diagnosis is performed when the power is turned on, and information input to the main microcomputer is monitored at all time. The
diagnosis is displayed by LED flashing.
INDICATION OF SELF DIAGNOSIS BY USING LED
Flashing LEDs located on the front panel indicate the result of self-diagnosis.
This model has a "Self-diagnosis function," which checks the operation state of the circuits inside the set, and informs us of a failure.
Diagnosis is performed when the power is turned on, and information input to the main microcomputer is monitored at all time. The
diagnosis is displayed by LED flashing.
INDICATION OF SELF DIAGNOSIS BY USING LED
Flashing LEDs located on the front panel indicate the result of self-diagnosis.
|
Type of error
|
POWER LED flash cycle
|
|
Low bias line short
protection |
Repeating slow flashes 9 times and
fast
flashes 9 times. |
<Explanation of
operation>
If an error is detected, the power is turned off.
Shortly after the power is turned off, the POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after the power is turned off.
If an error is detected, the power is turned off.
Shortly after the power is turned off, the POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after the power is turned off.
POWER SUPPLY CIRCUIT
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