JVC LT-26KM18/NSK, Service Manual

Page: 19 / 20

(No.YA655<Rev.001>)1-19
5.1.6 DETAILS
Self check is performed for the following items:
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.
< Explanation of operation >
If error is detected, the power is turned off. Shortly after the power is turned off, POWER LED will be blinked.
When the protection of low bias line short operates, the power cannot be turned on until the power cord takes out and inserts, after
the power is turned off.
Detection item Display Detection content
Diagnosis
signal (line)
Detection timing
Low bias line short
protection LOB Confirm the operation of the low bais(5V/12V/14V/16V/
24V) protection circuit.
5V:
Q9201 [DIGITAL PWB]
12V: Q9301 [DIGITAL PWB]
14V: Q9503 [POWER PWB]
16V: Q9505 [POWER PWB]
24V: Q9506 [POWER PWB]
PROTECTOR Detection starts 3 seconds after
the power is turned on. If error
continues between 200 ms the
power is turned off.
MAIN MEMORY MEM Confirmation of reply of ACK signal which uses I
2
C
communication.
IC7002 [DIGITAL PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I
2
C communication is
performed and no reply of ACK
signal an error will be counted.
AUDIO AIO Confirmation of reply of ACK signal which uses I
2
C
communication.
IC6002 [DIGITAL PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I
2
C communication is
performed and no reply of ACK
signal an error will be counted.
RF TUNER TUN Confirmation of reply of ACK signal which uses I
2
C
communication.
TU1001 [ANALOG PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I
2
C communication is
performed and no reply of ACK
signal an error will be counted.
HDMI HDM Confirmation of reply of ACK signal which uses I
2
C
communication.
IC8502 [DIGITAL PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I
2
C communication is
performed and no reply of ACK
signal an error will be counted.
SYNC SIGNAL SYN Confirmation of presence of sync signal in selected
video signal.
IC7001 [DIGITAL PWB]
--- The selected video input signal is
always checked and if there is the
sync signal, it is displayed as
"OK", and if not as "NG".
Type of error POWER LED flash cycle
Low bias line short protection Power LED turnig on and off at 1 second intervals.