1-56 (No.52169)
5.1.5
POINTS TO NOTE WHEN USING THE SELF-DIAGNOSIS FEATURE
In addition to circuit failures (abnormal operation), the following cases may also be iagnosed as "Abnormal" and displayed and counted
as "NG".
(1) Temporary defective transmissions across circuits due to pulse interruptions
(2) Misalignment in the on/off timing of power for I
2
C bus (VCC) when turning on/off the main power.
Diagnosis may be impeded if a large number of items are displayed as "NG". As such, start self-diagnosis check only after 3 seconds
in the case of receivers and 5 seconds in the case of panels upon turning on the power. If recurrences are expected, ensure to clear
(reset) the failure history and record the new diagnosis reults.
5.1.6
DETAILS
Self-diagnosis is performed for the following items:
•
PAGE 1
Item
Display
Description of detection
Diagnosis
signal (line)
Means of detection
Unit
LOW B LINE
SHORT
PROTECTION
LOB
Was Low B line short protector
activated?
No. of times short circuit protection
is triggered (9V/5V)
[Q1961, Q1962]
9V/5V
Detection starts 3 seconds upon
power on
Turns off power if NG is detected
within 200ms
Receiver
TIMER
TIM
Did power supply frequency
fluctuated from:
50Hz
→
60Hz
60Hz
→
50Hz
Number of counts
[IC1701]
AC
Regularly detects power supply
frequency by AC pulse counts and
monitors frequency fluctuations other
than instances immediately after reset
Receiver
WITH / WITHOUT
SYNC SIGNALS
SYNC
Are there synchronized signals?
HD: Color difference synchronized
signals (Yes / No )
M: Main Synchronized signals
(Yes / No)
S: Sub-synchronized signals
(Yes / No)
[HD: IC1211 M,S: IC3001]
SDA
Checks whether there are
synchronized signal in video signal
Receiver
MEMORY
MEM
Is ACK returned during I
2
C
transmission? [IC1703]
SDA
Monitors upon every I
2
C transmission
and counts if ACK is not returned
Receiver
AV SWITCH
AVSW
Same as above [IC1501]
SDA
Same as above
Receiver
VIDEO CHROMA
VCD
Same as above [IC301]
SDA
Same as above
Display
AUDIO
PROCESSING
AIO
Same as above [IC6521]
SDA
Same as above
Display
3D Y/C
SEPARATION
YC
Same as above [IC3001]
SDA
Same as above
Receiver
RF TUNER
TUN
Same as above [IC1101]
SDA
Same as above
Receiver
GHOST
REDUCTION
GCR
Not used
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MULTI-SCREEN
PROCESSING
PP
Is ACK returned during I
2
C
transmission? [IC1703]
SDA
Monitors upon every I
2
C transmission
and counts if ACK is not returned
Receiver
DIST
PROCESSING
IP
Same as above [IC201]
SDA
Same as above
Receiver
HDMI
HDMI
Not used (Only display)
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Содержание PD-42WV74
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