Brand: MITSUBISHI ELECTRIC
Category: Monitor
Document Type: Parts/Service
Language: EN
Parts/Service for SD420U/SD430U/XD420U/XD430U/XD435U/XD435U-G
Uploaded: Nov. 21, 2025, 6:13 p.m.
Manual Publish Date: 2006-01-01
- The projector supports PC compatibility with resolutions from 640x400 to 1280x1024.
- Video compatibility includes NTSC, PAL, SECAM, and component video (480i/p, 576i/p, 720p, 1080i).
- Features a 2W mono speaker.
- Connectors include S-Video, Video, Analog RGB, USB Memory, and Serial Terminal (RS-232C).
- Dimensions are 261(W) x 102(H) x 265(D) mm, weight approx. 2.6 kg.
- Operating temperature: 5°C to 35°C, humidity 30% to 90%.
Troubleshooting and error codes
| LED Indication | STATUS | Symptom | Failure | PCB | Check Point | Reset |
|---|---|---|---|---|---|---|
| POWER | --- | STBY12 is not supplied. | AC system (Primary power source) failure | POWER | PJ3 connector 4,6-pin (STBY12), F2 | Unplug and plug the power cord. |
| POWER | --- | STBY12 is supplied | LED failure | KEYPAD | LED1 | Unplug and plug the power cord. |
| Red / green alternately | No power-on | Lamp cover open | MAIN | J5 connector, Lamp cover | Auto | |
| Red / green alternately | Red | No power-on | Cooling fan (power) stopped | MAIN | J9 (FAN 1) connector | Unplug and plug the power cord. |
| Red / green alternately | Red | No power-on | Cooling fan (exhaust) stopped | MAIN | J8 (FAN 2) connector | Unplug and plug the power cord. |
| Red / green alternately | Green | No power-on | IIC bus failure of EEPROM | MAIN | U57, SCL0, SDA0 | Unplug and plug the power cord. |
| Red / green alternately | Orange | No power-on | STBYR5 power failure | POWER, MAIN | J12 connector 2-pin (STBYR5) | Unplug and plug the power cord. |
| Red / green alternately flash | No power-on | Disconnected thermister | MAIN | TEMP3 connector | Unplug and plug the power cord. | |
| Red | Orange flash2 | No power-on after power-off during power-on | High temperature of the power source | POWER, MAIN | Temperature of the heatsink of the power source, J12 connector 4-pin (POW-TMP) | Unplug and plug the power cord. |
| Red | Red | No power-on | Power-on is prohibited because of the end of the lamp life. | Replace the lamp and reset the lamp operating time. (Press and hold the Power,, and ► buttons on the projector together for 3 seconds.) | Manual | |
| Red | Orange flash5 | No power-on after power-off during power-on | High temperature of the intake air (outside air) | Temperature around the air inlet (on the back) | Auto | |
| Green flash | No power-on for one minute | Lamp fails to illuminate. | Auto | |||
| Red | Green flash2 | No power-on for one minute | Lamp goes out. | Damaged lamp | Auto | |
| Red/Green alternately flash3 | Green | Input signal is not displayed. | IIC bus failure of A/D, DECODER | MAIN | U10, U46 | Unplug and plug the power cord. |
| Red flash | Warning indicated by the LED during stby. | The end of the lamp life is near. (More than 75% of the lamp lifetime has been consumed.) | Manual | |||
| Red/Green alternately | Warning indicated by the LED during power-on. | The end of the lamp life is near. (More than 75% of the lamp lifetime has been consumed.) | Manual | |||
| Green flash (cycle: 1s) | No power-off for one minute after power-on | Auto | ||||
| Red flash (cycle: 1s) | No power-on for one minute | Power-on is prohibited during the lamp cooling time after power-off. | Auto | |||
| Red Green flash (cycle: 2s) | LED indication continues for 60-80 seconds after power-off. Power-on is allowed. | Power-on is allowed during the lamp cooling time after power-off, but the fans continue to operate. | Auto |