Sharp Aquos LC-42D72U, Service Manual

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LC-42D72U
4 – 20
1) Power LED (The power LED (Green) which lights during TV reception flashes.)
2) Power failure details (Power LED flashes twice and OPC LED flashes)
3) Communication failure details (Power LED flashes 3 times and OPC LED flashe
LED flashing timing chart for error notification.
Error type Power red LED operation (1 cycle) Pins are microprocessor pins.
Lamp failure
Flashes once: Fast L_FL_ERR (pin 73): L failure. Confirmed after 10 consecutive
matches at 500 ms intervals (detected only when the back-
light is on).
Note that after five match counts, the lamp cannot be acti-
vated 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 A is made or when the power is turned
on with [CH_DOWN] and [VOL_UP] on the unit down or after
continuous illumination for 3 minutes.
Power failure
Flashes twice Refer to “Power failure details”.
Communication failure with main CPU
Flashes 3 times Refer to "Communication failure details".
Communication line failure or main CPU communication fail-
ure. -> Check debug statements for the main CPU.
Vsync
Trident failure
Flashes 4 times VSYNC (pin 48) failure (uninput). Trident_IC operation failure.
Detected during operation (interruption).
Detected during operation (interruption).
Monitor temperature failure
Flashes 5 times If the panel temperature is 60?C or more for 15 seconds or
more in a row, CAUTION appears on the OSD of AVC
(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 activated.
(MONITOR MAX TEMP on page 23 of process A: Change of
temperature failure AD value): Thermistor
Error type Notification LED operation (1 cycle) Pins are microprocessor pins unless otherwise specified.
PS_ON
DET_10V failure
Flashes once DET_10V (pin 63). UR10V or A9V is not applied.
If error is detected during operation, the power is turned on
again by interrupt handling (instantaneous blackout process-
ing).
D_POW
DET_3V3 failure
Flashes twice DET_3V3 (pin 64) failure (L). D3.3V is not applied.
If error is detected during operation, error standby is activated
by polling.
D_POW
DET_6V failure
Flashes 3 times DET_6V (pin 27) failure (L). D5V or A5V is not applied.
If error is detected during operation, error standby is activated
by polling.
PANEL_POW
PNL_12V failure
Flashes 5 times DET_PNL_12V (pin 67) failure (L). Panel power is not
applied.
If error is detected during operation, error standby is activated
by polling.
Main failure
Flashes 7 times Main microprocessor detection error (FAN error, 1bitAMP
error, etc.)
The details are displayed in "ERROR STANDBY CAUSE" on
page 1 of process A for the main microprocessor.
Error type Notification LED operation (1 cycle)
Basically, communication logs are analyzed by a bus
monitor or debug print logs are analyzed.
Initial communication
reception failure
Flashes once 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.
250ms 1sec
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off
H: On
L: Off