JVC LT-26D50BJ Service Manual page 24

5.1.6 DETAILS
Self check is performed for the following items:
< Page 1 of screen >
Detection item Display
Low bias line short
protection
Abnormal rise of
temperature in audio
circuit
Presence of sync signal SYNC Confirmation of presence of video
d u p a
AC power input
Main CPU MSM
communication
Digital tuner
Main memory MEM
AV select switch AVSW Same as above.
3 dimensions YC
separator
t o r
Multi sound process
RF tuner
Ghost reduction
DIST process
RGB process
DVI (Digital communication)
Digital input HDMI
1-24 (No.YA205)
Detection content
LOB Confirmation of operation of the low bais
(2.5V / 3.3V / 5V / 9V) protection circuit.
Q9822 [REGULATOR PWB]
FAN Confirmation of the temperature of
audio circuit.
TH6661 [ANALOG SIGNAL PWB]
sync signal.
M : Main sync signal
S : Sub sync signal
HD : Component sync signal
IC201 [ANALOG SIGNAL PWB]
TIM Not used.
Not used.
DIGI Confirmation of reply of ACK signal
2
which uses I C communication.
[DIGITAL TUNER UNIT]
Confirmation of reply of ACK signal
2
which uses I C communication.
IC7602 [DIGITAL SIGNAL PWB]
IC301, IC501 [ANALOG SIGNAL PWB]
YC Not used.
AIO Not used.
TUN Confirmation of reply of ACK signal
2
which uses I C communication.
TU3001 [RECEIVER PWB]
GCR Not used.
IP Confirmation of reply of ACK signal
2
which uses I C communication.
IC3001 [DIGITAL SIGNAL PWB]
RGB Confirmation of reply of ACK signal
2
which uses I C communication.
IC3001 [DIGITAL SIGNAL PWB]
DVI Not used.
Not used.
Diagnosis
Detection timing
signal (line)
LB_PRO Detection starts 3 seconds after the
power is turned on.
If error continues between 400ms the
power is turned off.
SDA Detection starts 3 seconds after the
power is turned on.
If the temperture of 90°C is detected for
3 seconds the power is turned off.
SDA Confirmation of presence of sync signal
in video signal.
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SDA If it checks whenever I
is performed and no reply of ACK signal
an error will be counted.
SDA Same as above.
SDA Same as above.
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SDA If it checks whenever I
is performed and no reply of ACK signal
an error will be counted.
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SDA If it checks whenever I
is performed and no reply of ACK signal
an error will be counted.
SDA If it checks whenever I
is performed and no reply of ACK signal
an error will be counted.
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2
C communication
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2
C communication
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2
C communication
2
C communication
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