Sharp LC-37D90U Service Manual page 96

LC-37D90U
LED flashing timing chart for error notification.
1) Red power LED Remarks
Error type
Lamp failure
Flashes once: Fast L: Off
Power failure
Flashes twice
Communication failure with main CPU
Flashes 3 times
Vsync
IC3301 operation failure.
Flashes 4 times
Panel temperature failure
Flashes 5 times
2) Power failure details (Power LED flashes twice and OPC LED flashes)
Error type
PS_ON
UR+13V/UR+10V failure
Flashes once
EU_POW
D3.3V failure
Flashes twice
D_POW
UR+6V failure
Flashes 3 times
PANEL_POW
Panel 12V failure
Flashes 5 times
Main failure
Flashes 7 times
3) Communication failure details (Power LED flashes 3 times and OPC LED flashe
Error type
Initial communication
reception failure
Flashes once
250ms 1sec
Power red LED operation (1 cycle)
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
Power red LED operation (1 cycle)
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
Power red LED operation (1 cycle)
H: On
L: Off
6 – 17
Pins are microprocessor pins.
ERR_PNL (pin 73 of IC2002): Abnormal L. Confirmed after 5
consecutive detections at 1 second intervals (detected only
when the backlight is on). Note that after five detection
counts, the lamp cannot be activated except in the monitoring
process. (For the first time, only the inverter is reset, and error
OFF is not activated) Accumulated counts are cleared to 0
when the corresponding setting in the process is made, when
the power is turned on with [CH_DOWN] and [VOL_UP] on
the unit down or after continuous illumination for 3 minutes.
Refer to "Power failure details".
Refer to "Communication failure details".
Communication line failure or main CPU communication fail-
ure.
VSYNC (pin 48 of IC2002) failure (uninput). IC3301 operation
failure.
Detected during operation (interruption).
If the panel temperature is 60°C or more for 15 seconds or
more in a row, CAUTION appears on the OSD (flashes in red
in the lower right screen). If the panel temperature is 60°C or
more for 25 seconds or more in a row, error standby is acti-
vated.
Pins are microprocessor pins unless otherwise specified.
AC_DET (pin 31 of IC2002): Abnormal (L), DET_10V (pin 63
of IC2002). UR+10V is not applied.
If error is detected during operation, the power is turned on
again by interrupt handling (instantaneous blackout process-
ing).
DET_3V3 (pin 64 of IC2002): Abnormal (L). D3.3V is not
applied (IC9602).
If error is detected during operation, error standby is activated
by polling.
DET_6V (pin 27 of IC2002): Abnormal (L). UR+6V is not
applied.
If error is detected during operation, error standby is activated
by polling.
DET_PNL12V (pin 57 of IC2002): Abnormal (L). Panel power
is not applied.
If error is detected during operation, error standby is activated
by polling.
Main microprocessor (IC8101) detection error (FAN error,
etc.)
The details are displayed in "ERROR STANDBY CAUSE" for
the main microprocessor.
Basically, communication logs are analyzed by a bus
monitor or debug print logs are analyzed.
Initial communication from the main CPU is not received.
(After cancelling the reset, request for the monitor model No.
is not received.)
Communication line failure or main CPU start-up failure.