JVC PD-Z50DX4, Service Manual

Page: 31 / 189

(No.YA229)1-31
< Page 2 of screen (DISPLAY UNIT) >
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.
< 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.
Detection item
Item
name
Detection content
Diagnosis
signal (line)
Detection timing
Fan lock FAN Confirm the operation of the cooling fan.
IC807 [DISPLAY INTERFACE PWB]
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.
Abnormal of operation of
PDP (PANEL) ALM Confirm the operation of the panel
protection.
[PDP UNIT]
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.
Abnormal rise of
temperature in PDP
(PANEL) TMP It detects whether the temperature in a
display unit is normal.
IC8101 [TEMP. SENSOR PWB]
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 71
°
C for detection of
error over the predetermined 120 times,
the power is turned off.
Abnormal rise of
temperature in AUDIO
PWB ATP Not used. --- ---
Short circuit detection of
AUDIO PWB ASH Not used. --- ---
Panel communication PNL It confirm whether panel communication
is normal.
[PDP UNIT]
SDA If it checks whenever I
2
C communication
is performed, and no reply of ACK
signal, an error will be counted.
Panel memory MEM Confirmation of reply of ACK signal
which uses I
2
C communication.
IC805 [INTERFACE PWB]
SDA If it checks whenever I
2
C communication
is performed, and no reply of ACK
signal, an error will be counted.
Temp. sensor
operation TMP Same as above.
IC8101 [TEMP. SENSOR PWB]
SDA Same as above.
Audio control AIO Same as above.
IC6521 [AUDIO PWB]
SDA Same as above.
TYPE of error Item name POWER LED flash cycle
Low bias line short protection LOB Low luminance blue Flash 1.0 second / Low luminance blue Out 1.0 seconds
Abnormal of operation of PDP (PANEL) ALM High luminance blue Flash 1.0 second / High luminance blue Out 1.0 seconds
Abnormal rise of temperature in PDP (PANEL) TMP High luminance blue Flash 2.0 second / High luminance blue Out 2.0 seconds