JVC AV-48WP30 Service Manual page 52

TROUBLESHOOTING
SELF CHECK FUNCTIONS
This model has self-check functions that inform of the failure of the TV by detecting abnormality. Operational state is always
monitored and the identified is memorized on the record.
How to enter the SELF-CHECK mode
1. During the stand-by mode, turn the power on while pressing
the volume ( ▼ ) button on the TV set.
How to exit from the SELF-CHECK mode
1. By using the remote control unit, turn the power off. At this time,
the failure record is cleared.
2. Take off the AC plug from the wall outlet. At this time, the failure
record is not cleared.
"
SELF CHECK DISPLAY
The self-check results are shown on the following display.
Method of indication when the raster is not displayed (Fig.1).
Each failure is shown by turning POWER LED on and off at
specified intervals.
Item
X-ray protection
Turning on and off 0.1-second intervals
B1 Over-current
Turning on and off 1-second intervals
protection
Low B short protection
Turning on and off 2-second intervals
"
Explanation for activation of self-check functions
For X-ray protection, B1 over-current protection and low-B
protection, the power of the TV is turned off if NG is detected.
Immediately after the power is turned off, POWER LED will be
turning on and off.
When the power is turned off, you cannot turn the power on
again until the AC plug is taken out and put in again.
"
Because of the timing of Vcc start-up and shut-down of the IC
2
connecting to the I C bus during which the power is turned on
and off, the operation may be interpreted as an error.
In order to avoid the misinterpretation, the self-check functions
should be started at about 3 seconds after the power is turned
on.
"
The latest failure is stored on the record at the end.
The failure record for each check item is counted to the number
of 9 at the maximum, When more than 9 failures are stored on
the record, the counter remains stopped at 9.
POWER LED ON / OFF intervals
RESULT
ITEM
AIO
LOB
SYNC
MEM
VCD
AIO
TUN
PP
No. 51914
COUNT
NG2 OCP NG2
OK TIM OK
M:OK S:OK HD:NG
OK AVSW OK
NG2 BS OK
OK YC OK
OK OK OK
NG4 OK OK
SELF-CHECK SCREEN
AV-48WP30
51