JVC PD-50X795 Service Manual page 40

< Page 2 of screen (DISPLAY UNIT) >
Detection item Display
Fan lock FAN
[PD-50X795]
Abnormal of operation ALM
of PDP (PANEL)
Abnormal rise of TMP
temperature in PDP
(PANEL)
Abnormal rise of ATP
temperature in AUDIO
PWB
Short circuit detection ASH
of AUDIO PWB
Panel communication PNL
Panel memory MEM
Temp. sensor TMP
operation
Audio control AIO
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
Fan lock [Receiver unit]
ATSC digital tuner error
Fan lock [Display unit]
Abnormal of operation of PDP (PANEL)
Abnormal rise of temperature in PDP (PANEL)
< 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.
1-40 (No.YA100)
Detection content
Confirm the operation of the cooling
fan.
IC807 [DISPLAY INTERFACE PWB]
Confirm the operation of the panel
protection.
[PDP UNIT]
It detects whether the temperature in a
display unit is normal.
IC8101 [TEMP. SENSOR PWB]
Not used.
Not used.
It confirm whether panel
communication is normal.
[PDP UNIT]
Confirmation of reply of ACK signal
2
which uses I C communication.
IC805 [DISPLAY INTERFACE PWB]
Same as above.
IC8101 [TEMP. SENSOR PWB]
Same as above.
IC6521 [AUDIO PWB]
Display
LOB Low luminance blue Flash 1.0 second / Low luminance blue Out 1.0 seconds
FAN Low luminance blue Flash 0.1 second / Low luminance blue Out 0.1 seconds
--- Low luminance blue Flash 2.0 second / Low luminance blue Out 2.0 seconds
FAN High luminance blue Flash 0.1 second / High luminance blue Out 0.1 seconds
ALM High luminance blue Flash 1.0 second / High luminance blue Out 1.0 seconds
TMP High luminance blue Flash 2.0 second / High luminance blue Out 2.0 seconds
Diagnosis
signal
(line)
FAN_LOCK Detection starts 8 seconds after the power is
turned on.
Detection is performed every 16ms.
If errors continues between 300ms the power
is turned off.
SDA Detection starts 8 seconds after the power is
turned on.
Detection is performed every 16ms.
If errors continues between 300ms the power
is turned off.
SDA Detection starts 8 seconds after the power is
turned on.
Detection is performed every 0.5 seconds.
If a temperature rises beyond the temperature
of 71ºC for detection of error over the
predetermined 120 times the power is turned
off.
--- Not used.
--- Not used.
SDA If it checks whenever I
performed and no reply of ACK signal an error
will be counted.
SDA Same as above.
SDA Same as above.
SDA Same as above.
POWER LED flash cycle
Detection timing
2
C communication is
Unit
RECEIVER UNIT
RECEIVER UNIT
RECEIVER UNIT
DISPLAY UNIT
[PD-50X795]
DISPLAY UNIT
DISPLAY UNIT