JVC LT-42WX70/APT Service Manual page 23

5.1.6 DETAILS
Detection item
Low bias line short
protection
Panel error detect
Devices on the ANALOG I2C ANALOG Confirmation of reply of ACK
PWB
Devices on the DIGITAL I2C DIGITAL
PWB
Use time of LCD panel
lamp.
Last power off situation LAST ERROR Display the factor that the
5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT
In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.
Type of error
Low bias line short protection
Panel error detect
<Explanation of operation>
If error is detected, the power is turned off.
Shortly after a power is turned off, POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.
Display Detection content
POW PRO. Confirm the operation of the
low bias protection circuit.
INV PRO. Abnormality and connector
omission of inverter substrate.
signal which
communication.
HOURS The LCD panel use time is
counted.
power supply is turned off by
the figure.
POWER LED turnig on and off at 1 sec intervals.
POWER LED turnig on and off at 300msec intervals.
Diagnosi
s signal
(line)
LB_PRO Detection starts 3 seconds after the power is
turned on. If error continues between 200 ms
the power is turned off.
BL_DET It puts into the state of the standby when
BL_DET is HIGH after about 3sec after BL_ON
becomes HIGH, and LED is blinked.
(It restores it in power-off/on.)
Detection starts 3 seconds after the power is
uses I 2 C turned
SDA
communication is performed and no reply of
ACK signal an error will be counted.
BL_ON It is displayed by the decimal number on an
hour basis. (Refer to SECTION 1: HOW TO
CHECK THE OPERATING TIME)
--- 0: Normal
1: Low bias line short protection
9: Panel error detect
POWER LED flash cycle
Detection timing
on. If it checks whenever
(No.YA700<Rev.001>)1-23
I 2 C