Monday, November 02, 2015

JVC LT-37DS6FJ SERVICE MODE CHECKABLE AND POWER SUPPLY CIRCUIT

JVC LT-37DS6FJ 

SERVICE MODE CHECKABLE AND POWER SUPPLY CIRCUIT 

SYSTEM SETTING
Be sure to carry out the following operation at the end of the procedure.
(1) Press the [INFORMATION] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter the self check mode.
(3) Turn off the power by pressing the [POWER] key on the remote control unit.
SERVICE MODE SETTING
ADJUSTMENT PREPARATION
(1) 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.
(2) Make sure that connection is correctly made AC to AC power source.
(3) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.
(4) If the receive or input signal is not specified, use the most appropriate signal for adjustment.
(5) 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.
(2) In the SERVICE MENU, press the [1] key to display ADJUSTMENT MODE SCREEN.
NOTE:
# Before entering the SERVICE MODE, confirm that the setting of VCR/TV/DVD switch is at the "TV" side. If the switches have not been properly set, you cannot enter the SERVICE MODE.
# 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.
HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.
WHITE BALANCE
(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 < S030 > (Red drive), < S031 > (Green drive) or < S032 > (Blue drive) unchanged, then lower the other two so that the all-white screen is equally white throughout.
NOTE:
Set one or more of < S030 >, < S031 >, and < S032 > to "85".
(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 memoirze the set value.
SELF CHECK MODE
Before entering the SERVICE MODE, confirm that the setting of VCR/TV/ DVD switch is at the "TV" side. If the switches have not been properly set, you cannot enter the SERVICE MODE.
(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 1 and 2.
When a number key other than the [2] key is pressed in the SERVICE MODE screen, the other relevant screen may be displayed. This is not used in the SELF CHECK MODE. Press the [MENU] key to return to the MAIN MENU SCREEN.
EXIT THE SELF CHECK MODE
Turn off the power by unplugging the AC power cord plug whe 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
ITEMS UNDER SELF CHECK
Detection item
Display
Detection content
Low bias line short
protection



LOB


Confirmation of operation of the low bais (2.5V / 3.3V / 5V / 9V) protection circuit. Q9801 , Q9822 [REGULATOR PWB]

Abnormal rise of
temperature in audio
circuit


FAN


Confirmation of the temperature of
audio circuit. TH6661 [ANALOG SIGNAL PWB]


Presence of sync signal






SYNC





Confirmation of presence of video
sync signal.
M : Main sync signal
S : Sub sync signal
HD : Component sync signal
IC201 [ANALOG SIGNAL PWB]

AC power input

TIM

Not used.

Main CPU
communication
MSM

Not used.


Digital tuner

DIGI

Not used.
Main memory




MEM


Confirmation of reply of ACK signal
which uses I2C communication.
IC7602 [DIGITAL SIGNAL PWB]

AV select switch



AVSW

Same as above.
IC301, IC501 [ANALOG SIGNAL PWB]

3 dimensions YC
separator

YC


Not used.


Multi sound process
AIO

Not used.


RF tuner




TUN


Confirmation of reply of ACK signal
which uses I2C communication.
TU3002 [RECEIVER PWB]

Ghost reduction
GCR
Not used.
DIST process



IP



Confirmation of reply of ACK signal
which uses I2C communication.
IC3001 [DIGITAL SIGNAL PWB]

RGB process



RGB

Confirmation of reply of ACK signal
which uses I2C communication.
IC3001 [DIGITAL SIGNAL PWB]
DVI (Digital communication)
DVI
Not used.

Digital input

HDMI
Confirmation of reply of ACK signal
which uses I2C communication.
POWER SUPPLY CIRCUIT 

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