JVC LT-26WX84 Service Manual page 53

5.1.6 DETAILS
Self-diagnosis is performed for the following items:
• PAGE 1
Item Display
LOW B LINE LOB
SHORT
PROTECTION
TIMER TIM
WITH / WITHOUT SYNC Are there synchronized signals?
SYNC SIGNALS
MEMORY MEM
AV SWITCH AVSW Same as above [IC1301]
VIDEO CHROMA VCD
AUDIO AIO
PROCESSING
3D Y/C YC
SEPARATION
RF TUNER TUN
MULTI-SCREEN PP
PROCESSING
DIST IP
PROCESSING
HDMI HDMI
• PAGE 2
Item Display
DEFECTIVE AUDIO AP1
OUTPUT PART
AP2
DEVICE DRIVE DDT
COLOR
MANAGEMENT
A-D CONVERTER AD
Description of detection
Was Low B line short protector activated?
No. of times short circuit protection is
triggered
[POWER PWB]
(3.3V / LCD 5V / 9V / 13V / AVCC)
Did power supply frequency fluctuated
from:
50Hz → 60Hz
60Hz → 50Hz
Number of counts
[POWER PWB (PC9001)]
HD: Color difference synchronized signals
M: Main Synchronized signals
S: Sub-synchronized signals
[IC1211]
2
Is ACK returned during I C transmission?
[IC1703]
Same as above [IC7301]
Same as above [IC6501]
Same as above [IC3001]
Same as above [TU1101]
2
Is ACK returned during I C transmission? SDA
Same as above [IC201]
Not used (Only display)
Description of detection
Detects short and abnormal temperature
in audio circuit.
[IC6641]
Fault load of audio output part.
[IC6641]
2
Is ACK returned during I C transmission?
[IC401]
2
Is ACK returned during I C transmission?
[IC001]
Diagnosis
Means of detection
signal (line)
PROTECTOR Detection starts 3 seconds upon power on
Turns off power if NG is detected within
200ms
AC Regularly detects power supply frequency
by AC pulse counts and monitors
frequency fluctuations other than
instances immediately after reset
SDA Checks whether there are synchronized
signal in video signal
SDA Monitors upon every I
counts if ACK is not returned
SDA Same as above
SDA Same as above
SDA Same as above
SDA Same as above
SDA Same as above
Monitors upon every I
counts if ACK is not returned
SDA Same as above
----
Diagnosis
Means of detection
signal (line)
SDA Detection starts 3 seconds upon power
on. Performs detection every 16ms. If NG
lasts for 300ms, audio output part is defec-
tive.
Controls [ /AMP_RST] to [L]→(0.5S)→[H].
Monitors again, and turns off power if the
defect is not corrected within 3 seconds.
SDA Monitors upon every I
counts if ACK is not returned.
SDA Monitors upon every I
counts if ACK is not returned.
2
C transmission and
2
C transmission and
----
2
C transmission and
2
C transmission and
(No.YA003)1-53