Read Sharp LC-26GD7E (serv.man2) Service Manual online
27
TROUBLE SHOOTING TABLE (Continued)
LED flashing patterns for error notification
250 ms
1 sec
1) Red power LED
Remarks
Error type
Red power LED operation (one cycle)
"Pin" means a monitoring microcomputer pin.
H: On
Lamp failure
1 quick flash
L: Off
H: On
2) Refer to "Details of power failure".
Power failure
2 flashes
L: Off
Communication failur
e
H: On
3) Refer to "Details of communication failure".
between main CPUs
Communication line failure or main CPU communication failure
→
Check debug statements for the main CPU.
3 flashes
L: Off
H: On
Monitor temp. failure
5 flashes
L: Off
2) Details of power failure
(2 flashes of power LED and then flashes of alarm LED)
Remarks
Error type
Alarm LED operation (one cycle)
"Pin" means a monitoring microcomputer pin, unless otherwise noted.
H: On
15 V failure
1 flash
L: Off
H: On
2 flashes
L: Off
H: On
9 V (A) failure
3 flashes
L: Off
H: On
VSH 3.3 V failure
4 flashes
L: Off
H: On
3.3 V failure
5 flashes
L: Off
H: On
6 flashes
L: Off
3) Details of communication failure
(3 flashes of power LED and then flashes of alarm LED)
Remarks
Error type
Alarm LED operation (one cycle)
Initial communication
H: On
reception failure
1 flash
L: Off
Start-up reason
H: On
reception failure
2 flashes
L: Off
Regular communicati
o
H: On
failure
3 flashes
L: Off
H: On
Restart failure
4 flashes
L: Off
Power LED: P2304 (RM), pin
8
Alarm LED: TP2301 (IC2301, pin 22)
LCD controller PWB
Basically, communication logs are analyzed by a bus monitor or debug print logs are analyzed.
L_FL_ERR (pin 73) is defect (L). 5 sequential flashes at 1 second intervals indicate a lamp failure (failure can be detected o
nly while the backlight is on).
Be aware that the lamp failure detecting operation is not activated except in the monitoring process after the LED has flashed
5 times in total.
The total number of flashes is cleared to 0 by the setting in the monitoring process or after the LED lit up for 30 minutes in
a row.
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, the error standby is activated.
(OSTEMP in monitoring process OTHER 2: thermistor AD value appears, TEMP ERR in page FAN: temperature failure AD value is chang
ed): thermistor
Not used
Detected during start-up and operation (interruption)
FREERUN (pin 59) or STB (pin 32) is defect (L). 3.3 V is not applied to the LCD controller.
CSEN1 (pin 34) is defect (L).
VSH_IN (pin 36pin) is defect (H). VSH 3.3 V is not applied.
Detected during start-up and operation (interruption)
15V_CHK (pin 31) is defect (L). 15 V is not applied.
Detected only during start-up. When the error is detected during operation, the projector is restarted by an interrupt handling
(instantaneous blackout processing).
Not used
→
Main CPU start-up failure or monitoring microcomputer's reception failure
Regular communication that is performed at 1 second intervals in the normal operation is interrupted.
→
Main CPU operation failure or monitoring microcomputer's reception failure
Detected during start-up and operation (interruption). FREERUN is checked during start-up and STB is checked while light is on.
When the projector is restarted by program such as standby on/off, notice for the completion of restart is not received.
→
Main CPU restart failure or monitoring microcomputer's reception failure
Initial communication from the main CPU is not received. (Request for the monitor model No. is not received.)
→
Communication line failure or main CPU start-up failure
Reason for start-up is not received from the main CPU. (Start-up communication to start-up reason notification 22h is not recei
ved.)
NOTE: Connect a LED to P2304 for blinking codes
Troubleshooting for LCD-Controller and MICOM-Board
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