JVC LT-37X688 Service Manual

1-32 (No.YA535)
5.1.4 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.
5.1.5 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.
5.1.6 POINTS TO NOTE WHEN USING THE SELF CHECK
FEATURE
In addition to circuit failures (abnormal operation), the following
cases may also be diagnosed as "Abnormal" and counted.
(1) Temporary defective transmissions across circuits due to
pulse interruptions.
(2) Misalignment in the on/off timing of power for I
2
C bus (Vcc)
when turning on/off the main power.
Therefore, turn on the main power, and then wait for about 3
seconds before starting Self check.
If recurrences are expected, ensure to clear (reset) the failure
history and record the new diagnosis results.
5.1.7 DETAILS
Self check is performed for the following items:
<SELF CHECK MODE(TV-MICRO)>
<SELF CHECK MODE(DIGITAL)>
Detection item Display Detection content
Diagnosis
signal (line)
Detection timing
Low bias line short
protection
LOB Confirm the operation of the low bais (5V / 12V / 14V
/ 24V) protection circuit.
IC9651
, Q9051, Q9151[ANALOG PWB]
LB_PRO At 3 seconds after the power
is turned on, the self-check
function starts. If NG is
detected during 200ms, the
power is turned off
automatically.
Fan lock FAN Not used ---- ----
Audio AUD Not used ---- ----
Devices on the ANALOG
PWB
ANA Confirmation of reply of ACK signal which uses
I
2
C communication.
IC6601 [ANALOG PWB]
SDA Detection starts 3 seconds
after the power is turned on. If
it checks whenever I
2
C
communication is performed
and no reply of ACK signal an
error will be counted.
Devices on the DIGITAL
PWB
DIG Confirmation of reply of ACK signal which uses
I
2
C communication. [DIGITAL PWB]
SDA Same as above.
Detection item Display Detection content
Diagnosis
signal (line)
Detection timing
MTS decoder BTSC Dec Confirmation of reply of ACK signal which uses
I
2
C communication.
IC2101 [DIGITAL PWB]
SDA If it checks whenever I
2
C
communication is performed
and no reply of ACK signal an
error will be counted.
A-D converter for compo-
nent video
Comp.ADC Confirmation of reply of ACK signal which uses
I
2
C communication.
IC2201
[DIGITAL PWB]
SDA Same as above.

JVC LT-37X688 Specifications

General

Integrated clock	Yes
Comb filter	Digital
Display diagonal	37 \
Display brightness	500 cd/m²
Native aspect ratio	16:9
Viewing angle, horizontal	176 °
Analog signal format system	NTSC
HDCP	No
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
S-Video outputs quantity	1
Product color	Black
RMS rated power	20 W

Weight and Dimensions

Depth (without stand)	232 mm
Width (without stand)	927.1 mm
Height (without stand)	654.05 mm
Weight (without stand)	18280 g