Troubleshooting - JVC PD-Z35DV4 Service Manual

5.1 SELF-CHECK FEATURE
5.1.1 OUTLINE
This model has a "Self-check function", which checks the
operation state of the circuits and informs us of a failure by
flashing POWER LED when a failure occurs.
Diagnosis is performed when power is turned on, and
information input to the main microcomputer is monitored at all
time.
Failure detection is based on input state of I
various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF-CHECK MODE
(1) Press the [DISPLAY] key and the [MUTING] key
simultaneously, then the SERVICE MENU screen will be
displayed. (See Fig.1)
(2) In the SERVICE MENU, press the [2] key. Then, the SELF-
CHECK screen will be displayed. (See Fig.2)
(3) Press the [ZOOM (red)] key, then the second page of the
SELF-CHECK screen will be displayed.
NOTE:
•
When the [CINEMA (green)] key pressed, the first page
and the second page change screen.
5.1.3 HOW TO EXIT THE SELF-CHECK
(1) When you leave the failure history
Press the [MENU] key to exit the SELF-CHECK.
(2) When you not leave the failure history
In the SELF-CHECK, press the [POWER] key. Then the
power is turned off.
5.1.4 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.
5.1.5 POINTS TO NOTE WHEN USING THE SELF-CHECK
FEATURE
In addition to circuit failures (abnormal operation), the following
cases may also be iagnosed as "Abnormal" and displayed and
counted as "NG".
(1) Temporary defective transmissions across circuits due
to pulse interruptions.
(2) Misalignment in the on/off timing of power for I
when turning on/off the main power.
Diagnosis may be impeded if a large number of items are
displayed as "NG". As such, start self-check only after 5 seconds
in the case of panels upon turning on the power. If recurrences
are expected, ensure to clear (reset) the failure history and record
the new self-check reults.
1-40 (No.YA101)
SECTION 5

TROUBLESHOOTING

C bus and the
2
* As "SYNC" is not counted, the number of failures not displayed.
C bus (Vcc)
2
SERVICE MENU SCREEN SERVICE MENU SCREEN
SERVICE MENU
1. ADJUST
2. SELF CHECK
3. I2C STOP
Fig. 1
< SELF-CHECK SCREEN (Page 1) > < SELF-CHECK SCREEN (Page 1) >
LOB OK FAN
SYNC M:OK S:OK
TIM OK
MSM OK DIGI
MEM OK AVSW
YC OK AIO
TUN OK GCR
IP OK RGB
DVI OK HDMI
Item Item
CHECK
Normality
Abnormality
< SELF-CHECK SCREEN (Page 2) > < SELF-CHECK SCREEN (Page 2) >
FAN OK ALM
TMP OK
ATP OK ASH
PNL OK MEM
TMP OK AIO
Fig. 2
OK
HD:OK
OK
OK
OK
OK
NG 2
OK
: OK
: NG
OK
OK
OK
OK