JVC PD-Z50DX4/S Service Manual page 31

< Page 2 of screen (DISPLAY UNIT) >
Detection item
name
Fan lock FAN
Abnormal of operation of ALM
PDP (PANEL)
Abnormal rise of TMP
temperature in PDP
(PANEL)
Abnormal rise of ATP
temperature in AUDIO
PWB
Short circuit detection of ASH
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
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.
Item
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 [INTERFACE PWB]
Same as above.
IC8101 [TEMP. SENSOR PWB]
Same as above.
IC6521 [AUDIO PWB]
Item name
LOB
ALM
TMP
Diagnosis
signal (line)
FAN_LOCK
SDA
SDA
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SDA
SDA
SDA
SDA
POWER LED flash cycle
Low luminance blue Flash 1.0 second / Low luminance blue Out 1.0 seconds
High luminance blue Flash 1.0 second / High luminance blue Out 1.0 seconds
High luminance blue Flash 2.0 second / High luminance blue Out 2.0 seconds
Detection timing
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.
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.
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 71°C for detection of
error over the predetermined 120 times,
the power is turned off.
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2
If it checks whenever I C communication
is performed, and no reply of ACK
signal, an error will be counted.
2
If it checks whenever I C communication
is performed, and no reply of ACK
signal, an error will be counted.
Same as above.
Same as above.
(No.YA229)1-31