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.
