JVC LT-42FX77 Service Manual page 21

5.1.6 DETAILS
Self check is performed for the following items: (---- is not used Items)
< Page 1 of screen >
Detection item Display
Low bias line short LOB
protection
---- FAN
---- AUD
Devices on the ANALOG ANA
PWB
Devices on the DIGITAL DIG
PWB
< Page 2 of screen >
Detection item Display
---- TMP
---- L1
---- L2
---- DDT
---- FAN
---- LC
---- IRS
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
< 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.
Detection content
Confirm the operation of the low bais (5V / 12V /
24V) protection circuit.
IC9401,Q9401, Q9601, Q9801
----
----
Confirmation of reply of ACK signal which uses
2
I C communication.
IC101, IC102, IC381, IC551, IC601, IC606,
IC661, IC3501, TU3001 [ANALOG PWB]
Confirmation of reply of ACK signal which uses
2
I C communication.
IC5001 [DIGITAL PWB]
Detection content
----
----
----
----
----
----
----
Blue turnig on and off at 1 second intervals.
Diagnosis
signal (line)
LB_PRO
[DC-DC PWB]
----
----
SDA
SDA
Diagnosis
signal (line)
----
----
----
----
----
----
----
POWER LED flash cycle
Detection timing
Detection starts 3 seconds after
the power is turned on. If error
continues between 200 ms the
power is turned off.
----
----
If it checks whenever
communication is performed and
no reply of ACK signal an error
will be counted.
If it checks whenever
communication is performed and
no reply of ACK signal an error
will be counted.
Detection timing
----
----
----
----
----
----
----
(No.YA564<Rev.001>)1-21
2
I C
2
I C