Troubleshooting - JVC AV-56WP30 Service Manual

TROUBLESHOOTING

SELF CHECK FUNCTIONS
This m odel has self-check functions that inform of the failure of the TV by detecting abnormality. Operational state is always
monitor ed and the identified is m emorized on th e 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 dis played (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-cur rent
Turning on and off 1-sec ond intervals
protection
Low B short protection
Turning on and off 2-sec ond intervals
EXPLANATION FOR ACTIVATION OF SELF-CHECK
FUNCTIONS
" For X-ray protection, B1 over-c urrent protection and low B short
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.
" The latest failure is stored on the record at the end.
The failure rec ord 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.
" Becaus e of the timing of Vcc start-up and shut-down of the IC
connec ting to the I 2 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.
POWER LED ON / OFF inter vals
ITEM RESULT
XRAY
LO B
SYNC
MEM
VCD
AIO
TUN
PP
Fig. 1 SELF-CHECK SCREEN
No. 52007
AV-56WP30
CO UNT
NG 2 OCP NG 2
OK TIM OK
M:OK S:OK HD:NG
OK AVSW OK
NG 2 BS OK
OK YC OK
OK GCR OK
NG 4 IP OK
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